Merge pull request #224 from git-pkgs/magic-integration

Detect content types when browsing files

.github/workflows/ci.yml

@@ -17,12 +17,12 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
       - name: Set up Go
-        uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
+        uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
         with:
           go-version: ${{ matrix.go-version }}
 
@@ -35,12 +35,12 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
       - name: Set up Go
-        uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
+        uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
         with:
           go-version: '1.25'
 

.github/workflows/publish.yml

@@ -20,12 +20,12 @@ jobs:
       contents: read
     steps:
       - name: Check out the repo
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           persist-credentials: false
 
       - name: Log in to the Container registry
-        uses: docker/login-action@c99871dec2022cc055c062a10cc1a1310835ceb4
+        uses: docker/login-action@06fb636fac595d6fb4b28a5dfcb21a6f5091859c
         with:
           registry: ghcr.io
           username: ${{ github.actor }}

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -22,7 +22,7 @@ jobs:
       - uses: sigstore/cosign-installer@6f9f17788090df1f26f669e9d70d6ae9567deba6 # v4.1.2
 
       - name: Set up Go
-        uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
+        uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
         with:
           go-version-file: go.mod
           cache: false

.github/workflows/swagger.yml

@@ -12,12 +12,12 @@ jobs:
   swagger:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
       - name: Set up Go
-        uses: actions/setup-go@924ae3a1cded613372ab5595356fb5720e22ba16 # v6.5.0
+        uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
         with:
           go-version: '1.25'
 

.github/workflows/zizmor.yml

@@ -21,9 +21,9 @@ jobs:
       security-events: write
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           persist-credentials: false
 
       - name: Run zizmor
-        uses: zizmorcore/zizmor-action@192e21d79ab29983730a13d1382995c2307fbcaa # v0.5.7
+        uses: zizmorcore/zizmor-action@6fc4b006235f201fdab3722e17240ab420d580e5 # v0.6.1

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.26.4-alpine AS builder
+FROM golang:1.26.5-alpine AS builder
 
 WORKDIR /src
 

go.mod

@@ -5,18 +5,19 @@ go 1.25.6
 require (
 	github.com/BurntSushi/toml v1.6.0
 	github.com/CycloneDX/cyclonedx-go v0.11.0
-	github.com/git-pkgs/archives v0.3.0
+	github.com/git-pkgs/archives v0.4.0
 	github.com/git-pkgs/cooldown v0.1.1
-	github.com/git-pkgs/enrichment v0.4.1
+	github.com/git-pkgs/enrichment v0.6.4
-	github.com/git-pkgs/purl v0.1.13
+	github.com/git-pkgs/magic v0.1.0
-	github.com/git-pkgs/registries v0.6.2
+	github.com/git-pkgs/purl v0.1.15
+	github.com/git-pkgs/registries v0.6.4
 	github.com/git-pkgs/spdx v0.1.4
-	github.com/git-pkgs/vers v0.2.6
+	github.com/git-pkgs/vers v0.3.0
-	github.com/git-pkgs/vulns v0.1.6
+	github.com/git-pkgs/vulns v0.2.1
-	github.com/go-chi/chi/v5 v5.3.0
+	github.com/go-chi/chi/v5 v5.3.1
 	github.com/jmoiron/sqlx v1.4.0
 	github.com/lib/pq v1.12.3
-	github.com/prometheus/client_golang v1.23.2
+	github.com/prometheus/client_golang v1.24.0
 	github.com/prometheus/client_model v0.6.2
 	github.com/spdx/tools-golang v0.5.7
 	github.com/swaggo/swag v1.16.6
@@ -24,7 +25,7 @@ require (
 	golang.org/x/sync v0.22.0
 	google.golang.org/protobuf v1.36.11
 	gopkg.in/yaml.v3 v3.0.1
-	modernc.org/sqlite v1.53.0
+	modernc.org/sqlite v1.55.0
 )
 
 require (
@@ -115,7 +116,7 @@ require (
 	github.com/denis-tingaikin/go-header v0.5.0 // indirect
 	github.com/dlclark/regexp2 v1.11.5 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/ecosyste-ms/ecosystems-go v0.2.0 // indirect
+	github.com/ecosyste-ms/ecosystems-go v0.4.0 // indirect
 	github.com/ettle/strcase v0.2.0 // indirect
 	github.com/facebookgo/clock v0.0.0-20150410010913-600d898af40a // indirect
 	github.com/fatih/color v1.18.0 // indirect
@@ -217,15 +218,16 @@ require (
 	github.com/nishanths/exhaustive v0.12.0 // indirect
 	github.com/nishanths/predeclared v0.2.2 // indirect
 	github.com/nunnatsa/ginkgolinter v0.23.0 // indirect
-	github.com/oapi-codegen/runtime v1.4.1 // indirect
+	github.com/oapi-codegen/nullable v1.1.0 // indirect
+	github.com/oapi-codegen/runtime v1.6.0 // indirect
 	github.com/package-url/packageurl-go v0.1.6 // indirect
 	github.com/pandatix/go-cvss v0.6.2 // indirect
 	github.com/pelletier/go-toml v1.9.5 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/common v0.67.5 // indirect
+	github.com/prometheus/common v0.70.0 // indirect
-	github.com/prometheus/procfs v0.20.1 // indirect
+	github.com/prometheus/procfs v0.21.1 // indirect
 	github.com/quasilyte/go-ruleguard v0.4.5 // indirect
 	github.com/quasilyte/go-ruleguard/dsl v0.3.23 // indirect
 	github.com/quasilyte/gogrep v0.5.0 // indirect
@@ -265,7 +267,7 @@ require (
 	github.com/timonwong/loggercheck v0.11.0 // indirect
 	github.com/tomarrell/wrapcheck/v2 v2.12.0 // indirect
 	github.com/tommy-muehle/go-mnd/v2 v2.5.1 // indirect
-	github.com/ulikunitz/xz v0.5.15 // indirect
+	github.com/ulikunitz/xz v0.5.16 // indirect
 	github.com/ultraware/funlen v0.2.0 // indirect
 	github.com/ultraware/whitespace v0.2.0 // indirect
 	github.com/urfave/cli/v2 v2.3.0 // indirect
@@ -289,25 +291,25 @@ require (
 	go.opentelemetry.io/otel/trace v1.44.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	go.uber.org/zap v1.27.1 // indirect
-	go.yaml.in/yaml/v2 v2.4.3 // indirect
+	go.yaml.in/yaml/v2 v2.4.4 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/crypto v0.53.0 // indirect
 	golang.org/x/exp v0.0.0-20260218203240-3dfff04db8fa // indirect
 	golang.org/x/exp/typeparams v0.0.0-20260209203927-2842357ff358 // indirect
-	golang.org/x/mod v0.36.0 // indirect
+	golang.org/x/mod v0.37.0 // indirect
 	golang.org/x/net v0.56.0 // indirect
 	golang.org/x/oauth2 v0.36.0 // indirect
-	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
 	golang.org/x/text v0.38.0 // indirect
-	golang.org/x/tools v0.45.0 // indirect
+	golang.org/x/tools v0.47.0 // indirect
 	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
 	google.golang.org/api v0.272.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260316180232-0b37fe3546d5 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260414002931-afd174a4e478 // indirect
-	google.golang.org/grpc v1.81.1 // indirect
+	google.golang.org/grpc v1.82.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	honnef.co/go/tools v0.7.0 // indirect
-	modernc.org/libc v1.73.4 // indirect
+	modernc.org/libc v1.74.1 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect
 	mvdan.cc/gofumpt v0.9.2 // indirect

go.sum

@@ -66,8 +66,8 @@ github.com/CycloneDX/cyclonedx-go v0.11.0 h1:GokP8FiRC+foiuwWhSSLpSD5H4hSWtGnR3w
 github.com/CycloneDX/cyclonedx-go v0.11.0/go.mod h1:vUvbCXQsEm48OI6oOlanxstwNByXjCZ2wuleUlwGEO8=
 github.com/Djarvur/go-err113 v0.1.1 h1:eHfopDqXRwAi+YmCUas75ZE0+hoBHJ2GQNLYRSxao4g=
 github.com/Djarvur/go-err113 v0.1.1/go.mod h1:IaWJdYFLg76t2ihfflPZnM1LIQszWOsFDh2hhhAVF6k=
-github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.31.0 h1:DHa2U07rk8syqvCge0QIGMCE1WxGj9njT44GH7zNJLQ=
+github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.32.0 h1:rIkQfkCOVKc1OiRCNcSDD8ml5RJlZbH/Xsq7lbpynwc=
-github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.31.0/go.mod h1:P4WPRUkOhJC13W//jWpyfJNDAIpvRbAUIYLX/4jtlE0=
+github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.32.0/go.mod h1:RD2SsorTmYhF6HkTmDw7KmPYQk8OBYwTkuasChwv7R4=
 github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.55.0 h1:UnDZ/zFfG1JhH/DqxIZYU/1CUAlTUScoXD/LcM2Ykk8=
 github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.55.0/go.mod h1:IA1C1U7jO/ENqm/vhi7V9YYpBsp+IMyqNrEN94N7tVc=
 github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.55.0 h1:0s6TxfCu2KHkkZPnBfsQ2y5qia0jl3MMrmBhu3nCOYk=
@@ -217,8 +217,8 @@ github.com/dlclark/regexp2 v1.11.5 h1:Q/sSnsKerHeCkc/jSTNq1oCm7KiVgUMZRDUoRu0JQZ
 github.com/dlclark/regexp2 v1.11.5/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
-github.com/ecosyste-ms/ecosystems-go v0.2.0 h1:Nhpg54C+St8Sd/mf8bNJmQqx35ZgHw33TfFoxaXMQI8=
+github.com/ecosyste-ms/ecosystems-go v0.4.0 h1:5A+zF+XWT8sYYYjlc2/tI1SmiDGzbHLyT9CapVc5dGA=
-github.com/ecosyste-ms/ecosystems-go v0.2.0/go.mod h1:CCdzT1iAZirbEZAbFSnWpK88eKKaIWex7gjtZ0UudXA=
+github.com/ecosyste-ms/ecosystems-go v0.4.0/go.mod h1:FVswCrp3DQkur1HjVqfDF/gYrDSEmiFflntcB1G0DbA=
 github.com/envoyproxy/go-control-plane v0.14.0 h1:hbG2kr4RuFj222B6+7T83thSPqLjwBIfQawTkC++2HA=
 github.com/envoyproxy/go-control-plane/envoy v1.37.0 h1:u3riX6BoYRfF4Dr7dwSOroNfdSbEPe9Yyl09/B6wBrQ=
 github.com/envoyproxy/go-control-plane/envoy v1.37.0/go.mod h1:DReE9MMrmecPy+YvQOAOHNYMALuowAnbjjEMkkWOi6A=
@@ -244,30 +244,32 @@ github.com/fzipp/gocyclo v0.6.0 h1:lsblElZG7d3ALtGMx9fmxeTKZaLLpU8mET09yN4BBLo=
 github.com/fzipp/gocyclo v0.6.0/go.mod h1:rXPyn8fnlpa0R2csP/31uerbiVBugk5whMdlyaLkLoA=
 github.com/ghostiam/protogetter v0.3.20 h1:oW7OPFit2FxZOpmMRPP9FffU4uUpfeE/rEdE1f+MzD0=
 github.com/ghostiam/protogetter v0.3.20/go.mod h1:FjIu5Yfs6FT391m+Fjp3fbAYJ6rkL/J6ySpZBfnODuI=
-github.com/git-pkgs/archives v0.3.0 h1:iXKyO83jEFub1PGEDlHmk2tQ7XeV5LySTc0sEkH3x78=
+github.com/git-pkgs/archives v0.4.0 h1:KNmmIsLiSH27lUdT27EfUkQXFaLgXV5KezE81iyOIgo=
-github.com/git-pkgs/archives v0.3.0/go.mod h1:LTJ1iQVFA7otizWMOyiI82NYVmyBWAPRzwu/e30rcXU=
+github.com/git-pkgs/archives v0.4.0/go.mod h1:tfio0OIuPKEBKHs/UCL5XBUvYmKpnvtnba2iDlfSd6g=
 github.com/git-pkgs/cooldown v0.1.1 h1:9OqqzCB8gANz/y44SmqGD0Jp8Qtu81D1sCbKl6Ehg7w=
 github.com/git-pkgs/cooldown v0.1.1/go.mod h1:v7APuK/UouTiu8mWQZbdDmj7DfxxkGUeuhjaRB5gv9E=
-github.com/git-pkgs/enrichment v0.4.1 h1:A8BKs0XwvpF1sF5qviZy4fkJAe18qB9OgpbRnmwnT34=
+github.com/git-pkgs/enrichment v0.6.4 h1:mGrfenttwmcUfPXRkWpB0wBJiiGj55ltniUh66Pq4bU=
-github.com/git-pkgs/enrichment v0.4.1/go.mod h1:stHqZUitV9ZkwACqHzBysLMSe6T4QZn81hxTdSroNhM=
+github.com/git-pkgs/enrichment v0.6.4/go.mod h1:zz1vPUak/w8Jhajll0KDRN2MjKaEYeCzQTxumWnVhqY=
+github.com/git-pkgs/magic v0.1.0 h1:xLrqq7CMXB9g5bJnmJyKw17Rvlh0GFiEmO6e5RFsoeY=
+github.com/git-pkgs/magic v0.1.0/go.mod h1:3ndidt+yvFaI1M0aEkkzkOlFnLPkeVQASIUojazcxCI=
 github.com/git-pkgs/packageurl-go v0.3.1 h1:WM3RBABQZLaRBxgKyYughc3cVBE8KyQxbSC6Jt5ak7M=
 github.com/git-pkgs/packageurl-go v0.3.1/go.mod h1:rcIxiG37BlQLB6FZfgdj9Fm7yjhRQd3l+5o7J0QPAk4=
 github.com/git-pkgs/pom v0.1.5 h1:TGT8Az2OMxGWsXnSagtUMGzZm7Oax8HrSCteA+mi0qY=
 github.com/git-pkgs/pom v0.1.5/go.mod h1:ufdMBe1lKzqOeP9IUb9NPZ458xKV8E8NvuyBMxOfwIk=
-github.com/git-pkgs/purl v0.1.13 h1:at8BU6vnP5oonHFHAPA064BzgRqij+SZcOUDgNT2DC8=
+github.com/git-pkgs/purl v0.1.15 h1:iQ3clh0Cw41rkM0rf24B7ShnN9Z+UtLMAFlNDUs+Qd4=
-github.com/git-pkgs/purl v0.1.13/go.mod h1:8oCcdcYZA/e1B33e7Ylju6azboTKjdqf3ybcbQj6I/o=
+github.com/git-pkgs/purl v0.1.15/go.mod h1:PqCLVBDeZrZgHysR803/AntMELgIr2LFZVNCcwLH2m0=
-github.com/git-pkgs/registries v0.6.2 h1:26G5zW6Q7x1CSfNkaEqEjRMJiA4JwfdKOCJ7Qm+u0a8=
+github.com/git-pkgs/registries v0.6.4 h1:Kq/KlStjaQyE83UXT/tKuzCrIzc4keGeBjtroMqgoHA=
-github.com/git-pkgs/registries v0.6.2/go.mod h1:GR0Bu6nC3NQe6f7lfDoEVqAnoQkMocf4M98B12a7B3E=
+github.com/git-pkgs/registries v0.6.4/go.mod h1:YkGHbxHIe2Ha/ROH6zNkS5PJUUoa9g0Ti/s2XhZnrak=
 github.com/git-pkgs/spdx v0.1.4 h1:eQ0waEV3uUeItpWAOvdN1K1rL9hTgsU7fF74r1mDXMs=
 github.com/git-pkgs/spdx v0.1.4/go.mod h1:cqRoZcvl530s/W+oGNvwjt4ODN8T1W6D/20MUZEFdto=
-github.com/git-pkgs/vers v0.2.6 h1:IelZd7BP/JhzTloUTDY67nehUgoYva3g9viqAMCHJg8=
+github.com/git-pkgs/vers v0.3.0 h1:xM4LLUCRmqzdDfe+/pVQUx4SRyFXRVth6tOsJ14wMKU=
-github.com/git-pkgs/vers v0.2.6/go.mod h1:biTbSQK1qdbrsxDEKnqe3Jzclxz8vW6uDcwKjfUGcOo=
+github.com/git-pkgs/vers v0.3.0/go.mod h1:biTbSQK1qdbrsxDEKnqe3Jzclxz8vW6uDcwKjfUGcOo=
-github.com/git-pkgs/vulns v0.1.6 h1:8RRSgdlxp4JMU0Zykr63XTOMo5CyZKwt/PwaQxrx9Yg=
+github.com/git-pkgs/vulns v0.2.1 h1:tWGhOfPVDZwkM2Y9vRkMpMR+gjtlu2jhERS5JeNBoKQ=
-github.com/git-pkgs/vulns v0.1.6/go.mod h1:TsZC4MjoCkKJslgmbcmRCnytwnFcjESC2N8b0a2xDWc=
+github.com/git-pkgs/vulns v0.2.1/go.mod h1:/0gHKHQR5SWttZVEMqgOvCXssKFwAtbac/PfkhBax9o=
 github.com/github/go-spdx/v2 v2.7.0 h1:GzfXx4wFdlilARxmFRXW/mgUy3A4vSqZocCMFV6XFdQ=
 github.com/github/go-spdx/v2 v2.7.0/go.mod h1:Ftc45YYG1WzpzwEPKRVm9Jv8vDqOrN4gWoCkK+bHer0=
-github.com/go-chi/chi/v5 v5.3.0 h1:halUjDxhshgXHMrao5bB8eNBXo/rnzwr8m5m36glehM=
+github.com/go-chi/chi/v5 v5.3.1 h1:3j4HZLGZQ3JpMCrPJF/Jl3mYJfWLKBfNJ6quurUGCf8=
-github.com/go-chi/chi/v5 v5.3.0/go.mod h1:R+tYY2hNuVUUjxoPtqUdgBqevM9s9njzkTLutVsOCto=
+github.com/go-chi/chi/v5 v5.3.1/go.mod h1:R+tYY2hNuVUUjxoPtqUdgBqevM9s9njzkTLutVsOCto=
 github.com/go-critic/go-critic v0.14.3 h1:5R1qH2iFeo4I/RJU8vTezdqs08Egi4u5p6vOESA0pog=
 github.com/go-critic/go-critic v0.14.3/go.mod h1:xwntfW6SYAd7h1OqDzmN6hBX/JxsEKl5up/Y2bsxgVQ=
 github.com/go-jose/go-jose/v4 v4.1.4 h1:moDMcTHmvE6Groj34emNPLs/qtYXRVcd6S7NHbHz3kA=
@@ -422,8 +424,8 @@ github.com/kisielk/errcheck v1.9.0 h1:9xt1zI9EBfcYBvdU1nVrzMzzUPUtPKs9bVSIM3TAb3
 github.com/kisielk/errcheck v1.9.0/go.mod h1:kQxWMMVZgIkDq7U8xtG/n2juOjbLgZtedi0D+/VL/i8=
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 github.com/kkHAIKE/contextcheck v1.1.6/go.mod h1:3dDbMRNBFaq8HFXWC1JyvDSPm43CmE6IuHam8Wr0rkg=
-github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
+github.com/klauspost/compress v1.19.0 h1:sXLILfc9jV2QYWkzFOPWStmcUVH2RHEB1JCdY2oVvCQ=
-github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
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 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
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 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
@@ -512,8 +514,8 @@ github.com/nunnatsa/ginkgolinter v0.23.0 h1:x3o4DGYOWbBMP/VdNQKgSj+25aJKx2Pe6lHr
 github.com/nunnatsa/ginkgolinter v0.23.0/go.mod h1:9qN1+0akwXEccwV1CAcCDfcoBlWXHB+ML9884pL4SZ4=
 github.com/oapi-codegen/nullable v1.1.0 h1:eAh8JVc5430VtYVnq00Hrbpag9PFRGWLjxR1/3KntMs=
 github.com/oapi-codegen/nullable v1.1.0/go.mod h1:KUZ3vUzkmEKY90ksAmit2+5juDIhIZhfDl+0PwOQlFY=
-github.com/oapi-codegen/runtime v1.4.1 h1:9nwLoI+KrWxzbBcp0jO/R8uXqbik/HUyCvPeU68Y/qo=
+github.com/oapi-codegen/runtime v1.6.0 h1:7Xx+GlueD6nRuyKoCPzL434Jfi3BetbiJOrzCHp/VPU=
-github.com/oapi-codegen/runtime v1.4.1/go.mod h1:GwV7hC2hviaMzj+ITfHVRESK5J2W/GefVwIND/bMGvU=
+github.com/oapi-codegen/runtime v1.6.0/go.mod h1:GwV7hC2hviaMzj+ITfHVRESK5J2W/GefVwIND/bMGvU=
 github.com/onsi/ginkgo/v2 v2.28.1 h1:S4hj+HbZp40fNKuLUQOYLDgZLwNUVn19N3Atb98NCyI=
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 github.com/onsi/gomega v1.39.1 h1:1IJLAad4zjPn2PsnhH70V4DKRFlrCzGBNrNaru+Vf28=
@@ -541,14 +543,14 @@ github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 h1:GFCKgm
 github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10/go.mod h1:t/avpk3KcrXxUnYOhZhMXJlSEyie6gQbtLq5NM3loB8=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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-github.com/prometheus/client_golang v1.23.2 h1:Je96obch5RDVy3FDMndoUsjAhG5Edi49h0RJWRi/o0o=
+github.com/prometheus/client_golang v1.24.0 h1:5XStIklKuAtJSNpdD3s8XJj/Yv78IQmE1kbNk87JrAI=
-github.com/prometheus/client_golang v1.23.2/go.mod h1:Tb1a6LWHB3/SPIzCoaDXI4I8UHKeFTEQ1YCr+0Gyqmg=
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-github.com/prometheus/common v0.67.5 h1:pIgK94WWlQt1WLwAC5j2ynLaBRDiinoAb86HZHTUGI4=
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-github.com/prometheus/common v0.67.5/go.mod h1:SjE/0MzDEEAyrdr5Gqc6G+sXI67maCxzaT3A2+HqjUw=
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-github.com/prometheus/procfs v0.20.1 h1:XwbrGOIplXW/AU3YhIhLODXMJYyC1isLFfYCsTEycfc=
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-github.com/prometheus/procfs v0.20.1/go.mod h1:o9EMBZGRyvDrSPH1RqdxhojkuXstoe4UlK79eF5TGGo=
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@@ -654,8 +656,8 @@ github.com/tomarrell/wrapcheck/v2 v2.12.0 h1:H/qQ1aNWz/eeIhxKAFvkfIA+N7YDvq6TWVF
 github.com/tomarrell/wrapcheck/v2 v2.12.0/go.mod h1:AQhQuZd0p7b6rfW+vUwHm5OMCGgp63moQ9Qr/0BpIWo=
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 github.com/tommy-muehle/go-mnd/v2 v2.5.1/go.mod h1:WsUAkMJMYww6l/ufffCD3m+P7LEvr8TnZn9lwVDlgzw=
-github.com/ulikunitz/xz v0.5.15 h1:9DNdB5s+SgV3bQ2ApL10xRc35ck0DuIX/isZvIk+ubY=
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-github.com/ulikunitz/xz v0.5.15/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
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 github.com/ultraware/funlen v0.2.0 h1:gCHmCn+d2/1SemTdYMiKLAHFYxTYz7z9VIDRaTGyLkI=
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 github.com/ultraware/whitespace v0.2.0 h1:TYowo2m9Nfj1baEQBjuHzvMRbp19i+RCcRYrSWoFa+g=
@@ -702,8 +704,8 @@ go.augendre.info/fatcontext v0.9.0 h1:Gt5jGD4Zcj8CDMVzjOJITlSb9cEch54hjRRlN3qDoj
 go.augendre.info/fatcontext v0.9.0/go.mod h1:L94brOAT1OOUNue6ph/2HnwxoNlds9aXDF2FcUntbNw=
 go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
 go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
-go.opentelemetry.io/contrib/detectors/gcp v1.42.0 h1:kpt2PEJuOuqYkPcktfJqWWDjTEd/FNgrxcniL7kQrXQ=
+go.opentelemetry.io/contrib/detectors/gcp v1.43.0 h1:62yY3dT7/ShwOxzA0RsKRgshBmfElKI4d/Myu2OxDFU=
-go.opentelemetry.io/contrib/detectors/gcp v1.42.0/go.mod h1:W9zQ439utxymRrXsUOzZbFX4JhLxXU4+ZnCt8GG7yA8=
+go.opentelemetry.io/contrib/detectors/gcp v1.43.0/go.mod h1:RyaZMFY7yi1kAs45S6mbFGz8O8rqB0dTY14uzvG4LCs=
 go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.67.0 h1:yI1/OhfEPy7J9eoa6Sj051C7n5dvpj0QX8g4sRchg04=
 go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.67.0/go.mod h1:NoUCKYWK+3ecatC4HjkRktREheMeEtrXoQxrqYFeHSc=
 go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.67.0 h1:OyrsyzuttWTSur2qN/Lm0m2a8yqyIjUVBZcxFPuXq2o=
@@ -726,8 +728,8 @@ go.uber.org/multierr v1.11.0 h1:blXXJkSxSSfBVBlC76pxqeO+LN3aDfLQo+309xJstO0=
 go.uber.org/multierr v1.11.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 go.uber.org/zap v1.27.1 h1:08RqriUEv8+ArZRYSTXy1LeBScaMpVSTBhCeaZYfMYc=
 go.uber.org/zap v1.27.1/go.mod h1:GB2qFLM7cTU87MWRP2mPIjqfIDnGu+VIO4V/SdhGo2E=
-go.yaml.in/yaml/v2 v2.4.3 h1:6gvOSjQoTB3vt1l+CU+tSyi/HOjfOjRLJ4YwYZGwRO0=
+go.yaml.in/yaml/v2 v2.4.4 h1:tuyd0P+2Ont/d6e2rl3be67goVK4R6deVxCUX5vyPaQ=
-go.yaml.in/yaml/v2 v2.4.3/go.mod h1:zSxWcmIDjOzPXpjlTTbAsKokqkDNAVtZO0WOMiT90s8=
+go.yaml.in/yaml/v2 v2.4.4/go.mod h1:gMZqIpDtDqOfM0uNfy0SkpRhvUryYH0Z6wdMYcacYXQ=
 go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
 gocloud.dev v0.46.0 h1:niIuZwSjMtBx8K+ITB2s5kZullB13PGOS2ZoQPZxQ4Q=
@@ -755,8 +757,8 @@ golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/mod v0.13.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
-golang.org/x/mod v0.36.0 h1:JJjpVx6myfUsUdAzZuOSTTmRE0PfZeNWzzvKrP7amb4=
+golang.org/x/mod v0.37.0 h1:vF1DjpVEshcIqoEaauuHebaLk1O1forxjxBaVn884JQ=
-golang.org/x/mod v0.36.0/go.mod h1:moc6ELqsWcOw5Ef3xVprK5ul/MvtVvkIXLziUOICjUQ=
+golang.org/x/mod v0.37.0/go.mod h1:m8S8VeM9r4dzDwjrKO0a1sZP3YjeMamRRlD+fmR2Q/0=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200226121028-0de0cce0169b/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@@ -807,8 +809,8 @@ golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.46.0 h1:noSf2Fq6F8DBgS+LysIkx7rIExoNHJsxOAtPp4rthXw=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
-golang.org/x/sys v0.46.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
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@@ -839,8 +841,8 @@ golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
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-golang.org/x/tools v0.45.0 h1:18qN3FAooORvApf5XjCXgsuayZOEtXf6JK18I3+ONa8=
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-golang.org/x/tools v0.45.0/go.mod h1:LuUGqqaXcXMEFEruIVJVm5mgDD8vww/z/SR1gQ4uE/0=
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@@ -857,12 +859,12 @@ google.golang.org/api v0.272.0 h1:eLUQZGnAS3OHn31URRf9sAmRk3w2JjMx37d2k8AjJmA=
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-google.golang.org/genproto/googleapis/api v0.0.0-20260316180232-0b37fe3546d5 h1:CogIeEXn4qWYzzQU0QqvYBM8yDF9cFYzDq9ojSpv0Js=
+google.golang.org/genproto/googleapis/api v0.0.0-20260414002931-afd174a4e478 h1:yQugLulqltosq0B/f8l4w9VryjV+N/5gcW0jQ3N8Qec=
-google.golang.org/genproto/googleapis/api v0.0.0-20260316180232-0b37fe3546d5/go.mod h1:EIQZ5bFCfRQDV4MhRle7+OgjNtZ6P1PiZBgAKuxXu/Y=
+google.golang.org/genproto/googleapis/api v0.0.0-20260414002931-afd174a4e478/go.mod h1:C6ADNqOxbgdUUeRTU+LCHDPB9ttAMCTff6auwCVa4uc=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260316180232-0b37fe3546d5 h1:aJmi6DVGGIStN9Mobk/tZOOQUBbj0BPjZjjnOdoZKts=
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-google.golang.org/genproto/googleapis/rpc v0.0.0-20260316180232-0b37fe3546d5/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
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-google.golang.org/grpc v1.81.1 h1:VnnIIZ88UzOOKLukQi+ImGz8O1Wdp8nAGGnvOfEIWQQ=
+google.golang.org/grpc v1.82.1 h1:NnAxzGRA0677vCa4BUkOAnO5+FfQqVl9iUXeD0IqcGE=
-google.golang.org/grpc v1.81.1/go.mod h1:xGH9GfzOyMTGIOXBJmXt+BX/V0kcdQbdcuwQ/zNw42I=
+google.golang.org/grpc v1.82.1/go.mod h1:yzTZ1TB1Z3SG+LIYaI+WiE8D5+PZ3ArnrSp8zF3+/ZA=
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@@ -882,20 +884,20 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
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-modernc.org/cc/v4 v4.28.4 h1:Hd/4Es+MBj+/7hSdZaisNyu6bv3V0Dp2MdllyfqaH+c=
+modernc.org/cc/v4 v4.29.0 h1:CXgwL8cvxmyzBQZzbSl/6xFtMCryb6u8IOqDci39cgc=
-modernc.org/cc/v4 v4.28.4/go.mod h1:OnovgIhbbMXMu1aISnJ0wvVD1KnW+cAUJkIrAWh+kVI=
+modernc.org/cc/v4 v4.29.0/go.mod h1:OnovgIhbbMXMu1aISnJ0wvVD1KnW+cAUJkIrAWh+kVI=
-modernc.org/ccgo/v4 v4.34.4 h1:OVnSOWQjVKOYkFxoHYB+qQmSHK5gqMqARM+K9DpR/Ws=
+modernc.org/ccgo/v4 v4.34.6 h1:sBgfIwyN0TQ9C5hwIeuqyeAKyMWnbvj2fvpF4L11uzU=
-modernc.org/ccgo/v4 v4.34.4/go.mod h1:qdKqE8FNIYyysougB1RX9MxCzp5oJOcQXSobANJ4TuE=
+modernc.org/ccgo/v4 v4.34.6/go.mod h1:SZ8YcN9NG7XVsQYdm6jYBvi8PQP1qi+kqB6OhjqI3Fk=
 modernc.org/fileutil v1.4.0 h1:j6ZzNTftVS054gi281TyLjHPp6CPHr2KCxEXjEbD6SM=
 modernc.org/fileutil v1.4.0/go.mod h1:EqdKFDxiByqxLk8ozOxObDSfcVOv/54xDs/DUHdvCUU=
 modernc.org/gc/v2 v2.6.5 h1:nyqdV8q46KvTpZlsw66kWqwXRHdjIlJOhG6kxiV/9xI=
 modernc.org/gc/v2 v2.6.5/go.mod h1:YgIahr1ypgfe7chRuJi2gD7DBQiKSLMPgBQe9oIiito=
-modernc.org/gc/v3 v3.1.3 h1:6QAplYyVO+KdPW3pGnqmJDUxtkec8ooEWvks/hhU3lc=
+modernc.org/gc/v3 v3.1.4 h1:2g65LGVSmFQrXeITAw97x7hCRvZFcyE1uDP+7Vng7JI=
-modernc.org/gc/v3 v3.1.3/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
+modernc.org/gc/v3 v3.1.4/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
 modernc.org/goabi0 v0.2.0 h1:HvEowk7LxcPd0eq6mVOAEMai46V+i7Jrj13t4AzuNks=
 modernc.org/goabi0 v0.2.0/go.mod h1:CEFRnnJhKvWT1c1JTI3Avm+tgOWbkOu5oPA8eH8LnMI=
-modernc.org/libc v1.73.4 h1:+ra4Ui8ngyt8HDcO1FTDPWlkAh6yOdaO2yAoh8MddQA=
+modernc.org/libc v1.74.1 h1:bdR4VTKFMC4966QSNZ05XLGI/VwzVa2kTUX51Dm0riQ=
-modernc.org/libc v1.73.4/go.mod h1:DXZ3eO8qMCNn2SnmTNCiC71nJ9Rcq3PsnpU6Vc4rWK8=
+modernc.org/libc v1.74.1/go.mod h1:uH4t5bOx3G3g9Xcmj10YKlTcVISlRDwv8VoQJG9n8Os=
 modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
 modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
 modernc.org/memory v1.11.0 h1:o4QC8aMQzmcwCK3t3Ux/ZHmwFPzE6hf2Y5LbkRs+hbI=
@@ -904,8 +906,8 @@ modernc.org/opt v0.2.0 h1:tGyef5ApycA7FSEOMraay9SaTk5zmbx7Tu+cJs4QKZg=
 modernc.org/opt v0.2.0/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
 modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
 modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
-modernc.org/sqlite v1.53.0 h1:20WG8N9q4ji/dEqGk4uiI0c6OPjSeLTNYGFCc3+7c1M=
+modernc.org/sqlite v1.55.0 h1:hIFh0MCH0rGinQ/4KYb5/UbCkRkb+UP+OkLCVWa5MTM=
-modernc.org/sqlite v1.53.0/go.mod h1:xoEpOIpGrgT48H5iiyt/YXPCZPEzlfmfFwtk8Lklw8s=
+modernc.org/sqlite v1.55.0/go.mod h1:4ntCLuNmnH8+GNqjka1wNg7KJd5/Hi5FYp8K+XQ7GZw=
 modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
 modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=

internal/handler/cargo.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
+	"net/url"
 	"strings"
 	"time"
 )
@@ -28,11 +29,18 @@ type CargoHandler struct {
 }
 
 // NewCargoHandler creates a new cargo protocol handler.
-func NewCargoHandler(proxy *Proxy, proxyURL string) *CargoHandler {
+func NewCargoHandler(proxy *Proxy, proxyURL, indexURL, downloadURL string) *CargoHandler {
+	if strings.TrimSpace(indexURL) == "" {
+		indexURL = cargoUpstream
+	}
+	if strings.TrimSpace(downloadURL) == "" {
+		downloadURL = cargoDownloadBase
+	}
+
 	return &CargoHandler{
 		proxy:       proxy,
-		indexURL:    cargoUpstream,
+		indexURL:    strings.TrimSuffix(indexURL, "/"),
-		downloadURL: cargoDownloadBase,
+		downloadURL: strings.TrimSuffix(downloadURL, "/"),
 		proxyURL:    strings.TrimSuffix(proxyURL, "/"),
 	}
 }
@@ -189,10 +197,17 @@ func (h *CargoHandler) handleDownload(w http.ResponseWriter, r *http.Request) {
 	h.proxy.Logger.Info("cargo download request",
 		"crate", name, "version", version, "filename", filename)
 
-	result, err := h.proxy.GetOrFetchArtifact(r.Context(), "cargo", name, version, filename)
+	downloadURL := fmt.Sprintf(
+		"%s/%s/%s",
+		h.downloadURL,
+		url.PathEscape(name),
+		url.PathEscape(filename),
+	)
+	result, err := h.proxy.GetOrFetchArtifactFromURL(
+		r.Context(), "cargo", name, version, filename, downloadURL,
+	)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch crate")
-		http.Error(w, "failed to fetch crate", http.StatusBadGateway)
 		return
 	}
 

internal/handler/cargo_test.go

@@ -2,6 +2,7 @@ package handler
 
 import (
 	"encoding/json"
+	"io"
 	"log/slog"
 	"net/http"
 	"net/http/httptest"
@@ -10,6 +11,7 @@ import (
 	"time"
 
 	"github.com/git-pkgs/cooldown"
+	"github.com/git-pkgs/registries/fetch"
 )
 
 func cargoTestProxy() *Proxy {
@@ -70,6 +72,75 @@ func TestCargoConfigEndpoint(t *testing.T) {
 	}
 }
 
+func TestCargoHandlerUsesConfiguredUpstreams(t *testing.T) {
+	t.Run("index", func(t *testing.T) {
+		var requestPath, authHeader string
+		upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			requestPath = r.URL.Path
+			authHeader = r.Header.Get("Authorization")
+			if authHeader != "Bearer cargo-token" {
+				w.WriteHeader(http.StatusUnauthorized)
+				return
+			}
+			w.Header().Set("Content-Type", "text/plain")
+			_, _ = io.WriteString(w, `{"name":"serde","vers":"1.0.0"}`)
+		}))
+		defer upstream.Close()
+
+		proxy, _, _, _ := setupTestProxy(t)
+		proxy.HTTPClient = upstream.Client()
+		proxy.AuthForURL = func(string) (string, string) {
+			return "Authorization", "Bearer cargo-token"
+		}
+		h := NewCargoHandler(
+			proxy,
+			"http://proxy.test",
+			upstream.URL+"/index/",
+			"https://crates.example.test/files/",
+		)
+
+		req := httptest.NewRequest(http.MethodGet, "/se/rd/serde", nil)
+		w := httptest.NewRecorder()
+		h.Routes().ServeHTTP(w, req)
+
+		if w.Code != http.StatusOK {
+			t.Fatalf("status = %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+		}
+		if requestPath != "/index/se/rd/serde" {
+			t.Errorf("upstream path = %q, want %q", requestPath, "/index/se/rd/serde")
+		}
+		if authHeader != "Bearer cargo-token" {
+			t.Errorf("Authorization = %q, want %q", authHeader, "Bearer cargo-token")
+		}
+	})
+
+	t.Run("download", func(t *testing.T) {
+		proxy, _, _, artifactFetcher := setupTestProxy(t)
+		artifactFetcher.artifact = &fetch.Artifact{
+			Body:        io.NopCloser(strings.NewReader("crate")),
+			ContentType: "application/gzip",
+		}
+		h := NewCargoHandler(
+			proxy,
+			"http://proxy.test",
+			"https://index.example.test/root/",
+			"https://crates.example.test/files/",
+		)
+
+		req := httptest.NewRequest(http.MethodGet, "/crates/serde/1.0.0/download", nil)
+		w := httptest.NewRecorder()
+		h.Routes().ServeHTTP(w, req)
+
+		if w.Code != http.StatusOK {
+			t.Fatalf("status = %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+		}
+		want := "https://crates.example.test/files/serde/serde-1.0.0.crate"
+		if artifactFetcher.fetchedURL != want {
+			t.Errorf("fetched URL = %q, want %q", artifactFetcher.fetchedURL, want)
+		}
+	})
+}
+
 func TestCargoIndexProxy(t *testing.T) {
 	// Create a mock upstream index server
 	indexContent := `{"name":"serde","vers":"1.0.0","deps":[],"cksum":"abc123"}

internal/handler/composer.go

@@ -346,8 +346,7 @@ func (h *ComposerHandler) handleDownload(w http.ResponseWriter, r *http.Request)
 
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "composer", packageName, version, filename, downloadURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 

internal/handler/conan.go

@@ -84,8 +84,7 @@ func (h *ConanHandler) handleRecipeFile(w http.ResponseWriter, r *http.Request)
 
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "conan", packageName, storageVersion, storageFilename, upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch file")
-		http.Error(w, "failed to fetch file", http.StatusBadGateway)
 		return
 	}
 
@@ -122,8 +121,7 @@ func (h *ConanHandler) handlePackageFile(w http.ResponseWriter, r *http.Request)
 
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "conan", packageName, storageVersion, storageFilename, upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch file")
-		http.Error(w, "failed to fetch file", http.StatusBadGateway)
 		return
 	}
 

internal/handler/conda.go

@@ -72,8 +72,7 @@ func (h *CondaHandler) handleDownload(w http.ResponseWriter, r *http.Request) {
 
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "conda", packageName, version, filename, upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 

internal/handler/container.go

@@ -2,6 +2,7 @@ package handler
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
@@ -117,8 +118,12 @@ func (h *ContainerHandler) handleBlobDownload(w http.ResponseWriter, r *http.Req
 	)
 
 	if err != nil {
+		if errors.Is(err, ErrUpstreamNotFound) {
+			h.containerError(w, http.StatusNotFound, "BLOB_UNKNOWN", "blob unknown to registry")
+			return
+		}
 		h.proxy.Logger.Error("failed to fetch blob", "error", err)
-		h.containerError(w, http.StatusBadGateway, "BLOB_UNKNOWN", "failed to fetch blob")
+		h.containerError(w, http.StatusBadGateway, "INTERNAL_ERROR", "failed to fetch blob")
 		return
 	}
 

internal/handler/cran.go

@@ -72,8 +72,7 @@ func (h *CRANHandler) handleSourceDownload(w http.ResponseWriter, r *http.Reques
 
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "cran", name, version, filename, upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 
@@ -107,8 +106,7 @@ func (h *CRANHandler) handleBinaryDownload(w http.ResponseWriter, r *http.Reques
 
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "cran", name, storageVersion, filename, upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 

internal/handler/debian.go

@@ -81,8 +81,7 @@ func (h *DebianHandler) handlePackageDownload(w http.ResponseWriter, r *http.Req
 	result, err := h.proxy.GetOrFetchArtifactFromURL(
 		r.Context(), "deb", name, version, filename, downloadURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get debian package", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 

internal/handler/filename_download.go

@@ -0,0 +1,39 @@
+package handler
+
+import (
+	"net/http"
+	"strings"
+)
+
+type filenameDownload struct {
+	ecosystem string
+	suffix    string
+	parseErr  string
+	fetchErr  string
+	parse     func(string) (name, version string)
+}
+
+func (p *Proxy) handleFilenameDownload(w http.ResponseWriter, r *http.Request, d filenameDownload) {
+	filename := r.PathValue("filename")
+	if filename == "" || !strings.HasSuffix(filename, d.suffix) {
+		http.Error(w, "invalid filename", http.StatusBadRequest)
+		return
+	}
+
+	name, version := d.parse(filename)
+	if name == "" || version == "" {
+		http.Error(w, d.parseErr, http.StatusBadRequest)
+		return
+	}
+
+	p.Logger.Info(d.ecosystem+" download request",
+		"name", name, "version", version, "filename", filename)
+
+	result, err := p.GetOrFetchArtifact(r.Context(), d.ecosystem, name, version, filename)
+	if err != nil {
+		p.serveArtifactError(w, err, d.fetchErr)
+		return
+	}
+
+	ServeArtifact(w, result)
+}

internal/handler/gem.go

@@ -58,30 +58,13 @@ func (h *GemHandler) Routes() http.Handler {
 
 // handleDownload serves a gem file, fetching and caching from upstream if needed.
 func (h *GemHandler) handleDownload(w http.ResponseWriter, r *http.Request) {
-	filename := r.PathValue("filename")
+	h.proxy.handleFilenameDownload(w, r, filenameDownload{
-	if filename == "" || !strings.HasSuffix(filename, ".gem") {
+		ecosystem: "gem",
-		http.Error(w, "invalid filename", http.StatusBadRequest)
+		suffix:    ".gem",
-		return
+		parseErr:  "could not parse gem filename",
-	}
+		fetchErr:  "failed to fetch gem",
-
+		parse:     h.parseGemFilename,
-	// Extract name and version from filename (e.g., "rails-7.1.0.gem")
+	})
-	name, version := h.parseGemFilename(filename)
-	if name == "" || version == "" {
-		http.Error(w, "could not parse gem filename", http.StatusBadRequest)
-		return
-	}
-
-	h.proxy.Logger.Info("gem download request",
-		"name", name, "version", version, "filename", filename)
-
-	result, err := h.proxy.GetOrFetchArtifact(r.Context(), "gem", name, version, filename)
-	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
-		http.Error(w, "failed to fetch gem", http.StatusBadGateway)
-		return
-	}
-
-	ServeArtifact(w, result)
 }
 
 // parseGemFilename extracts name and version from a gem filename.

internal/handler/handler.go

@@ -104,6 +104,7 @@ type Proxy struct {
 	// storage at an internal one.
 	DirectServeBaseURL string
 	HTTPClient         *http.Client
+	AuthForURL         func(string) (headerName, headerValue string)
 }
 
 // NewProxy creates a new Proxy with the given dependencies.
@@ -251,6 +252,9 @@ func (p *Proxy) fetchAndCache(ctx context.Context, ecosystem, name, version, fil
 	// Resolve download URL
 	info, err := p.Resolver.Resolve(ctx, ecosystem, name, version)
 	if err != nil {
+		if errors.Is(err, fetch.ErrNotFound) {
+			return nil, ErrUpstreamNotFound
+		}
 		return nil, fmt.Errorf("resolving download URL: %w", err)
 	}
 
@@ -270,6 +274,9 @@ func (p *Proxy) fetchAndCache(ctx context.Context, ecosystem, name, version, fil
 	if err != nil {
 		metrics.RecordUpstreamFetch(ecosystem, fetchDuration)
 		metrics.RecordUpstreamError(ecosystem, "fetch_failed")
+		if errors.Is(err, fetch.ErrNotFound) {
+			return nil, ErrUpstreamNotFound
+		}
 		return nil, fmt.Errorf("fetching from upstream: %w", err)
 	}
 	metrics.RecordUpstreamFetch(ecosystem, fetchDuration)
@@ -399,6 +406,7 @@ func (p *Proxy) ProxyUpstream(w http.ResponseWriter, r *http.Request, upstreamUR
 			req.Header.Set(header, v)
 		}
 	}
+	p.applyUpstreamAuth(req)
 
 	resp, err := p.HTTPClient.Do(req)
 	if err != nil {
@@ -425,6 +433,7 @@ func (p *Proxy) ProxyFile(w http.ResponseWriter, r *http.Request, upstreamURL st
 		http.Error(w, "failed to create request", http.StatusInternalServerError)
 		return
 	}
+	p.applyUpstreamAuth(req)
 
 	resp, err := p.HTTPClient.Do(req)
 	if err != nil {
@@ -451,7 +460,18 @@ func JSONError(w http.ResponseWriter, status int, message string) {
 }
 
 // ErrUpstreamNotFound indicates the upstream returned 404.
-var ErrUpstreamNotFound = fmt.Errorf("upstream: not found")
+var ErrUpstreamNotFound = fmt.Errorf("upstream: %w", fetch.ErrNotFound)
+
+// serveArtifactError writes response for a failed fetch:
+// 404 when upstream reports artifact missing, 502 otherwise.
+func (p *Proxy) serveArtifactError(w http.ResponseWriter, err error, clientMsg string) {
+	if errors.Is(err, ErrUpstreamNotFound) {
+		http.Error(w, "not found", http.StatusNotFound)
+		return
+	}
+	p.Logger.Error("failed to get artifact", "error", err)
+	http.Error(w, clientMsg, http.StatusBadGateway)
+}
 
 // errStale304 is returned when upstream sends 304 but the cached file is missing.
 var errStale304 = fmt.Errorf("upstream returned 304 but cached file is missing")
@@ -554,6 +574,7 @@ func (p *Proxy) fetchUpstreamMetadata(ctx context.Context, upstreamURL string, e
 		return nil, "", "", zeroTime, fmt.Errorf("creating request: %w", err)
 	}
 	req.Header.Set("Accept", accept)
+	p.applyUpstreamAuth(req)
 
 	if entry != nil && entry.ETag.Valid {
 		req.Header.Set("If-None-Match", entry.ETag.String)
@@ -743,6 +764,7 @@ func (p *Proxy) proxyMetadataStream(w http.ResponseWriter, r *http.Request, upst
 		accept = acceptHeaders[0]
 	}
 	req.Header.Set("Accept", accept)
+	p.applyUpstreamAuth(req)
 
 	for _, header := range []string{headerAcceptEncoding, "If-Modified-Since", "If-None-Match"} {
 		if v := r.Header.Get(header); v != "" {
@@ -767,6 +789,17 @@ func (p *Proxy) proxyMetadataStream(w http.ResponseWriter, r *http.Request, upst
 	_, _ = io.Copy(w, resp.Body)
 }
 
+func (p *Proxy) applyUpstreamAuth(req *http.Request) {
+	if p.AuthForURL == nil {
+		return
+	}
+
+	headerName, headerValue := p.AuthForURL(req.URL.String())
+	if headerName != "" && headerValue != "" {
+		req.Header.Set(headerName, headerValue)
+	}
+}
+
 // GetOrFetchArtifactFromURL retrieves an artifact from cache or fetches from a specific URL.
 // This is useful for registries where download URLs are determined from metadata.
 func (p *Proxy) GetOrFetchArtifactFromURL(ctx context.Context, ecosystem, name, version, filename, downloadURL string) (*CacheResult, error) {
@@ -795,6 +828,9 @@ func (p *Proxy) fetchAndCacheFromURL(ctx context.Context, ecosystem, name, versi
 
 	artifact, err := p.Fetcher.FetchWithHeaders(ctx, downloadURL, headers)
 	if err != nil {
+		if errors.Is(err, fetch.ErrNotFound) {
+			return nil, ErrUpstreamNotFound
+		}
 		return nil, fmt.Errorf("fetching from upstream: %w", err)
 	}
 

internal/handler/hex.go

@@ -53,30 +53,13 @@ func (h *HexHandler) Routes() http.Handler {
 
 // handleDownload serves a package tarball, fetching and caching from upstream if needed.
 func (h *HexHandler) handleDownload(w http.ResponseWriter, r *http.Request) {
-	filename := r.PathValue("filename")
+	h.proxy.handleFilenameDownload(w, r, filenameDownload{
-	if filename == "" || !strings.HasSuffix(filename, ".tar") {
+		ecosystem: "hex",
-		http.Error(w, "invalid filename", http.StatusBadRequest)
+		suffix:    ".tar",
-		return
+		parseErr:  "could not parse tarball filename",
-	}
+		fetchErr:  "failed to fetch package",
-
+		parse:     h.parseTarballFilename,
-	// Extract name and version from filename (e.g., "phoenix-1.7.10.tar")
+	})
-	name, version := h.parseTarballFilename(filename)
-	if name == "" || version == "" {
-		http.Error(w, "could not parse tarball filename", http.StatusBadRequest)
-		return
-	}
-
-	h.proxy.Logger.Info("hex download request",
-		"name", name, "version", version, "filename", filename)
-
-	result, err := h.proxy.GetOrFetchArtifact(r.Context(), "hex", name, version, filename)
-	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
-		return
-	}
-
-	ServeArtifact(w, result)
 }
 
 // parseTarballFilename extracts name and version from a hex tarball filename.

internal/handler/julia.go

@@ -90,8 +90,7 @@ func (h *JuliaHandler) handleRegistry(w http.ResponseWriter, r *http.Request) {
 	upstreamURL := h.upstreamURL + r.URL.Path
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "julia", juliaRegistryName, hash, hash+".tar.gz", upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get registry", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch registry")
-		http.Error(w, "failed to fetch registry", http.StatusBadGateway)
 		return
 	}
 
@@ -119,8 +118,7 @@ func (h *JuliaHandler) handlePackage(w http.ResponseWriter, r *http.Request) {
 	upstreamURL := h.upstreamURL + r.URL.Path
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "julia", name, hash, hash+".tar.gz", upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get package", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 
@@ -141,8 +139,7 @@ func (h *JuliaHandler) handleArtifact(w http.ResponseWriter, r *http.Request) {
 	upstreamURL := h.upstreamURL + r.URL.Path
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "julia", juliaArtifactName, hash, hash+".tar.gz", upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch artifact")
-		http.Error(w, "failed to fetch artifact", http.StatusBadGateway)
 		return
 	}
 

internal/handler/maven.go

@@ -130,12 +130,7 @@ func (h *MavenHandler) handleDownload(w http.ResponseWriter, r *http.Request, ur
 		}
 	}
 	if err != nil {
-		if errors.Is(err, ErrUpstreamNotFound) {
+		h.proxy.serveArtifactError(w, err, "failed to fetch artifact")
-			http.Error(w, "not found", http.StatusNotFound)
-			return
-		}
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
-		http.Error(w, "failed to fetch artifact", http.StatusBadGateway)
 		return
 	}
 

internal/handler/notfound_ecosystems_test.go

@@ -0,0 +1,151 @@
+package handler
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/git-pkgs/registries/fetch"
+)
+
+func TestArtifactDownloadUpstreamNotFoundReturns404(t *testing.T) {
+	tests := []struct {
+		name    string
+		path    string
+		handler func(p *Proxy) http.Handler
+	}{
+		{"debian", "/pool/main/n/nginx/nginx_1.18.0-6_amd64.deb",
+			func(p *Proxy) http.Handler { return NewDebianHandler(p, "http://localhost").Routes() }},
+		{"rpm", "/releases/39/Everything/x86_64/os/Packages/n/nginx-1.24.0-1.fc39.x86_64.rpm",
+			func(p *Proxy) http.Handler { return NewRPMHandler(p, "http://localhost").Routes() }},
+		{"nuget", "/v3-flatcontainer/newtonsoft.json/13.0.3/newtonsoft.json.13.0.3.nupkg",
+			func(p *Proxy) http.Handler { return NewNuGetHandler(p, "http://localhost").Routes() }},
+		{"pypi", "/packages/packages/ab/cd/ef0123456789/requests-2.31.0-py3-none-any.whl",
+			func(p *Proxy) http.Handler { return NewPyPIHandler(p, "http://localhost").Routes() }},
+		{"cran", "/src/contrib/ggplot2_3.4.4.tar.gz",
+			func(p *Proxy) http.Handler { return NewCRANHandler(p, "http://localhost").Routes() }},
+		{"conda", "/conda-forge/linux-64/numpy-1.26.0-py311_0.tar.bz2",
+			func(p *Proxy) http.Handler { return NewCondaHandler(p, "http://localhost").Routes() }},
+		{"conan", "/v1/files/zlib/1.3.1/_/_/0/recipe/conan_sources.tgz",
+			func(p *Proxy) http.Handler { return NewConanHandler(p, "http://localhost").Routes() }},
+		{"gem", "/gems/rails-7.1.0.gem",
+			func(p *Proxy) http.Handler { return NewGemHandler(p, "http://localhost").Routes() }},
+		{"hex", "/tarballs/phoenix-1.7.10.tar",
+			func(p *Proxy) http.Handler { return NewHexHandler(p, "http://localhost").Routes() }},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			proxy, _, _, fetcher := setupTestProxy(t)
+			fetcher.fetchErr = fetch.ErrNotFound
+
+			srv := httptest.NewServer(tt.handler(proxy))
+			defer srv.Close()
+
+			resp, err := http.Get(srv.URL + tt.path)
+			if err != nil {
+				t.Fatalf("request failed: %v", err)
+			}
+			defer func() { _ = resp.Body.Close() }()
+
+			if resp.StatusCode != http.StatusNotFound {
+				t.Errorf("want 404 for missing upstream artifact, got %d", resp.StatusCode)
+			}
+		})
+	}
+}
+
+func TestJuliaPackageUpstreamNotFoundReturns404(t *testing.T) {
+	proxy, _, _, fetcher := setupTestProxy(t)
+	fetcher.fetchErr = fetch.ErrNotFound
+
+	dead := httptest.NewServer(http.NotFoundHandler())
+	defer dead.Close()
+
+	h := NewJuliaHandler(proxy, "http://localhost")
+	h.upstreamURL = dead.URL
+
+	srv := httptest.NewServer(h.Routes())
+	defer srv.Close()
+
+	resp, err := http.Get(srv.URL +
+		"/package/7876af07-990d-54b4-ab0e-23690620f79a/0123456789abcdef0123456789abcdef01234567")
+	if err != nil {
+		t.Fatalf("request failed: %v", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	if resp.StatusCode != http.StatusNotFound {
+		t.Errorf("want 404 for missing upstream package, got %d", resp.StatusCode)
+	}
+}
+
+func TestComposerDownloadUpstreamNotFoundReturns404(t *testing.T) {
+	proxy, _, _, fetcher := setupTestProxy(t)
+	fetcher.fetchErr = fetch.ErrNotFound
+
+	meta := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == "/p2/monolog/monolog.json" {
+			_, _ = w.Write([]byte(`{
+				"packages": {
+					"monolog/monolog": [
+						{"version": "2.9.1", "dist": {"url": "https://example.com/monolog-2.9.1.zip", "type": "zip"}}
+					]
+				}
+			}`))
+			return
+		}
+		http.NotFound(w, r)
+	}))
+	defer meta.Close()
+
+	h := &ComposerHandler{proxy: proxy, repoURL: meta.URL, proxyURL: "http://localhost"}
+	srv := httptest.NewServer(h.Routes())
+	defer srv.Close()
+
+	resp, err := http.Get(srv.URL + "/files/monolog/monolog/2.9.1/monolog-2.9.1.zip")
+	if err != nil {
+		t.Fatalf("request failed: %v", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	if resp.StatusCode != http.StatusNotFound {
+		t.Errorf("want 404 for missing upstream dist, got %d", resp.StatusCode)
+	}
+}
+
+func TestContainerBlobUpstreamNotFoundReturns404(t *testing.T) {
+	authServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = w.Write([]byte(`{"token": "test-token-123"}`))
+	}))
+	defer authServer.Close()
+
+	proxy, _, _, _ := setupTestProxy(t)
+	proxy.Fetcher = &mockFetcherWithHeaders{
+		fetchFn: func(_ context.Context, _ string, _ http.Header) (*fetch.Artifact, error) {
+			return nil, fetch.ErrNotFound
+		},
+	}
+
+	h := &ContainerHandler{
+		proxy:       proxy,
+		registryURL: "https://registry-1.docker.io",
+		authURL:     authServer.URL,
+		proxyURL:    "http://localhost:8080",
+	}
+
+	req := httptest.NewRequest(http.MethodGet,
+		"/library/nginx/blobs/sha256:abc123def456abc123def456abc123def456abc123def456abc123def456abcd", nil)
+	w := httptest.NewRecorder()
+	h.Routes().ServeHTTP(w, req)
+
+	if w.Code != http.StatusNotFound {
+		t.Errorf("want 404 for missing upstream blob, got %d; body: %s", w.Code, w.Body.String())
+	}
+	if !strings.Contains(w.Body.String(), "BLOB_UNKNOWN") {
+		t.Errorf("want BLOB_UNKNOWN error code in body, got: %s", w.Body.String())
+	}
+}

internal/handler/notfound_test.go

@@ -0,0 +1,83 @@
+package handler
+
+import (
+	"context"
+	"errors"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/git-pkgs/registries/fetch"
+)
+
+func TestErrUpstreamNotFoundWrapsFetchErrNotFound(t *testing.T) {
+	if !errors.Is(ErrUpstreamNotFound, fetch.ErrNotFound) {
+		t.Fatal("ErrUpstreamNotFound does not wrap fetch.ErrNotFound")
+	}
+}
+
+func TestGetOrFetchArtifactFromURL_NotFound(t *testing.T) {
+	proxy, _, _, fetcher := setupTestProxy(t)
+	fetcher.fetchErr = fetch.ErrNotFound
+
+	_, err := proxy.GetOrFetchArtifactFromURL(context.Background(),
+		"maven", "org.example:missing", "1.0", "missing-1.0.jar",
+		"http://upstream.test/org/example/missing/1.0/missing-1.0.jar")
+
+	if !errors.Is(err, ErrUpstreamNotFound) {
+		t.Fatalf("want ErrUpstreamNotFound, got %v", err)
+	}
+}
+
+func TestMavenHandler_UpstreamNotFoundReturns404(t *testing.T) {
+	proxy, _, _, fetcher := setupTestProxy(t)
+	fetcher.fetchErr = fetch.ErrNotFound
+
+	h := NewMavenHandler(proxy, "http://localhost", "http://upstream.test", "http://portal.test")
+	srv := httptest.NewServer(h.Routes())
+	defer srv.Close()
+
+	resp, err := http.Get(srv.URL + "/org/example/missing/1.0/missing-1.0.jar")
+	if err != nil {
+		t.Fatalf("request failed: %v", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	if resp.StatusCode != http.StatusNotFound {
+		t.Errorf("want 404 for missing upstream artifact, got %d", resp.StatusCode)
+	}
+}
+
+func TestMavenHandler_PluginPortalFallback(t *testing.T) {
+	proxy, _, _, fetcher := setupTestProxy(t)
+	fetcher.fetchErrByURL = map[string]error{
+		"http://upstream.test/org/example/plugin/1.0/plugin-1.0.jar": fetch.ErrNotFound,
+	}
+	fetcher.artifact = &fetch.Artifact{
+		Body:        io.NopCloser(strings.NewReader("portal artifact")),
+		ContentType: "application/java-archive",
+	}
+
+	h := NewMavenHandler(proxy, "http://localhost", "http://upstream.test", "http://portal.test")
+	srv := httptest.NewServer(h.Routes())
+	defer srv.Close()
+
+	resp, err := http.Get(srv.URL + "/org/example/plugin/1.0/plugin-1.0.jar")
+	if err != nil {
+		t.Fatalf("request failed: %v", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+
+	if resp.StatusCode != http.StatusOK {
+		t.Fatalf("want 200 via plugin portal fallback, got %d", resp.StatusCode)
+	}
+	body, _ := io.ReadAll(resp.Body)
+	if string(body) != "portal artifact" {
+		t.Errorf("want portal artifact body, got %q", body)
+	}
+	if fetcher.fetchedURL != "http://portal.test/org/example/plugin/1.0/plugin-1.0.jar" {
+		t.Errorf("fallback did not hit plugin portal, last URL: %s", fetcher.fetchedURL)
+	}
+}

internal/handler/npm.go

@@ -25,10 +25,14 @@ type NPMHandler struct {
 }
 
 // NewNPMHandler creates a new npm protocol handler.
-func NewNPMHandler(proxy *Proxy, proxyURL string) *NPMHandler {
+func NewNPMHandler(proxy *Proxy, proxyURL, upstreamURL string) *NPMHandler {
+	if strings.TrimSpace(upstreamURL) == "" {
+		upstreamURL = npmUpstream
+	}
+
 	return &NPMHandler{
 		proxy:       proxy,
-		upstreamURL: npmUpstream,
+		upstreamURL: strings.TrimSuffix(upstreamURL, "/"),
 		proxyURL:    strings.TrimSuffix(proxyURL, "/"),
 	}
 }
@@ -261,8 +265,20 @@ func (h *NPMHandler) handleDownload(w http.ResponseWriter, r *http.Request) {
 	h.proxy.Logger.Info("npm download request",
 		"package", packageName, "version", version, "filename", filename)
 
-	result, err := h.proxy.GetOrFetchArtifact(r.Context(), "npm", packageName, version, filename)
+	downloadURL := fmt.Sprintf(
+		"%s/%s/-/%s",
+		h.upstreamURL,
+		escapeNPMDownloadPackage(packageName),
+		url.PathEscape(filename),
+	)
+	result, err := h.proxy.GetOrFetchArtifactFromURL(
+		r.Context(), "npm", packageName, version, filename, downloadURL,
+	)
 	if err != nil {
+		if errors.Is(err, ErrUpstreamNotFound) {
+			JSONError(w, http.StatusNotFound, "package not found")
+			return
+		}
 		h.proxy.Logger.Error("failed to get artifact", "error", err)
 		JSONError(w, http.StatusBadGateway, "failed to fetch package")
 		return
@@ -271,6 +287,14 @@ func (h *NPMHandler) handleDownload(w http.ResponseWriter, r *http.Request) {
 	ServeArtifact(w, result)
 }
 
+func escapeNPMDownloadPackage(packageName string) string {
+	scope, name, scoped := strings.Cut(packageName, "/")
+	if scoped && strings.HasPrefix(scope, "@") && len(scope) > 1 && name != "" && !strings.Contains(name, "/") {
+		return url.PathEscape(scope) + "/" + url.PathEscape(name)
+	}
+	return url.PathEscape(packageName)
+}
+
 // extractPackageName extracts the package name from the request path.
 // Handles both scoped (@scope/name) and unscoped (name) packages.
 func (h *NPMHandler) extractPackageName(r *http.Request) string {

internal/handler/npm_test.go

@@ -2,13 +2,16 @@ package handler
 
 import (
 	"encoding/json"
+	"io"
 	"log/slog"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 	"time"
 
 	"github.com/git-pkgs/cooldown"
+	"github.com/git-pkgs/registries/fetch"
 )
 
 const testVersion100 = "1.0.0"
@@ -46,6 +49,86 @@ func TestNPMExtractVersionFromFilename(t *testing.T) {
 	}
 }
 
+func TestNPMHandlerUsesConfiguredUpstream(t *testing.T) {
+	t.Run("metadata", func(t *testing.T) {
+		var requestPath, authHeader string
+		upstream := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			requestPath = r.URL.Path
+			authHeader = r.Header.Get("Authorization")
+			if authHeader != "Bearer npm-token" {
+				w.WriteHeader(http.StatusUnauthorized)
+				return
+			}
+			w.Header().Set("Content-Type", "application/json")
+			_, _ = io.WriteString(w, `{"versions":{}}`)
+		}))
+		defer upstream.Close()
+
+		proxy, _, _, _ := setupTestProxy(t)
+		proxy.HTTPClient = upstream.Client()
+		proxy.AuthForURL = func(string) (string, string) {
+			return "Authorization", "Bearer npm-token"
+		}
+		h := NewNPMHandler(proxy, "http://proxy.test", upstream.URL+"/root/")
+
+		req := httptest.NewRequest(http.MethodGet, "/testpkg", nil)
+		w := httptest.NewRecorder()
+		h.Routes().ServeHTTP(w, req)
+
+		if w.Code != http.StatusOK {
+			t.Fatalf("status = %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+		}
+		if requestPath != "/root/testpkg" {
+			t.Errorf("upstream path = %q, want %q", requestPath, "/root/testpkg")
+		}
+		if authHeader != "Bearer npm-token" {
+			t.Errorf("Authorization = %q, want %q", authHeader, "Bearer npm-token")
+		}
+	})
+
+	t.Run("download", func(t *testing.T) {
+		proxy, _, _, artifactFetcher := setupTestProxy(t)
+		artifactFetcher.artifact = &fetch.Artifact{
+			Body:        io.NopCloser(strings.NewReader("package")),
+			ContentType: "application/gzip",
+		}
+		h := NewNPMHandler(proxy, "http://proxy.test", "https://npm.example.test/root/")
+
+		req := httptest.NewRequest(http.MethodGet, "/testpkg/-/testpkg-1.0.0.tgz", nil)
+		w := httptest.NewRecorder()
+		h.Routes().ServeHTTP(w, req)
+
+		if w.Code != http.StatusOK {
+			t.Fatalf("status = %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+		}
+		want := "https://npm.example.test/root/testpkg/-/testpkg-1.0.0.tgz"
+		if artifactFetcher.fetchedURL != want {
+			t.Errorf("fetched URL = %q, want %q", artifactFetcher.fetchedURL, want)
+		}
+	})
+
+	t.Run("scoped download", func(t *testing.T) {
+		proxy, _, _, artifactFetcher := setupTestProxy(t)
+		artifactFetcher.artifact = &fetch.Artifact{
+			Body:        io.NopCloser(strings.NewReader("package")),
+			ContentType: "application/gzip",
+		}
+		h := NewNPMHandler(proxy, "http://proxy.test", "https://npm.example.test/root/")
+
+		req := httptest.NewRequest(http.MethodGet, "/@scope/name/-/name-1.0.0.tgz", nil)
+		w := httptest.NewRecorder()
+		h.Routes().ServeHTTP(w, req)
+
+		if w.Code != http.StatusOK {
+			t.Fatalf("status = %d, want %d; body: %s", w.Code, http.StatusOK, w.Body.String())
+		}
+		want := "https://npm.example.test/root/@scope/name/-/name-1.0.0.tgz"
+		if artifactFetcher.fetchedURL != want {
+			t.Errorf("fetched URL = %q, want %q", artifactFetcher.fetchedURL, want)
+		}
+	})
+}
+
 func TestNPMRewriteMetadata(t *testing.T) {
 	h := &NPMHandler{
 		proxy:    testProxy(),

internal/handler/nuget.go

@@ -314,8 +314,7 @@ func (h *NuGetHandler) handleDownload(w http.ResponseWriter, r *http.Request) {
 
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "nuget", name, version, filename, upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 

internal/handler/pub.go

@@ -67,8 +67,7 @@ func (h *PubHandler) handleDownload(w http.ResponseWriter, r *http.Request) {
 
 	result, err := h.proxy.GetOrFetchArtifact(r.Context(), "pub", name, version, filename)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 

internal/handler/pypi.go

@@ -426,8 +426,7 @@ func (h *PyPIHandler) handleDownload(w http.ResponseWriter, r *http.Request) {
 
 	result, err := h.proxy.GetOrFetchArtifactFromURL(r.Context(), "pypi", name, version, filename, upstreamURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get artifact", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 

internal/handler/rpm.go

@@ -83,8 +83,7 @@ func (h *RPMHandler) handlePackageDownload(w http.ResponseWriter, r *http.Reques
 	result, err := h.proxy.GetOrFetchArtifactFromURL(
 		r.Context(), "rpm", name, version, filename, downloadURL)
 	if err != nil {
-		h.proxy.Logger.Error("failed to get rpm package", "error", err)
+		h.proxy.serveArtifactError(w, err, "failed to fetch package")
-		http.Error(w, "failed to fetch package", http.StatusBadGateway)
 		return
 	}
 

internal/server/browse.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"bufio"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -10,29 +11,22 @@ import (
 
 	"github.com/git-pkgs/archives"
 	"github.com/git-pkgs/archives/diff"
+	"github.com/git-pkgs/magic"
 	"github.com/git-pkgs/proxy/internal/database"
 	"github.com/git-pkgs/purl"
 	"github.com/go-chi/chi/v5"
 )
 
-const contentTypePlainText = "text/plain; charset=utf-8"
+const (
+	contentTypePlainText = "text/plain; charset=utf-8"
+	browseSniffSize      = 512
+)
 
 // maxBrowseArchiveSize caps how much data openArchive will buffer for
 // prefix detection. Artifacts larger than this are rejected to prevent
 // memory exhaustion from a single request.
 const maxBrowseArchiveSize = 512 << 20 // 512 MB
 
-// archiveFilename returns a filename suitable for archive format detection.
-// Some ecosystems (e.g. composer) store artifacts with bare hash filenames
-// that have no extension. This adds .zip when the original has no extension
-// and the content is likely a zip archive.
-func archiveFilename(filename string) string {
-	if path.Ext(filename) == "" {
-		return filename + ".zip"
-	}
-	return filename
-}
-
 // detectSingleRootDir returns the single top-level directory name if all files
 // in the archive live under one common directory (e.g. GitHub zipballs use
 // "repo-hash/"). Returns "" if there's no single root or the archive is flat.
@@ -66,8 +60,6 @@ func detectSingleRootDir(reader archives.Reader) string {
 // and stripping a single top-level directory prefix (like GitHub zipballs).
 // For npm, the hardcoded "package/" prefix takes precedence.
 func openArchive(filename string, content io.Reader, ecosystem string) (archives.Reader, error) { //nolint:ireturn // wraps multiple archive implementations
-	fname := archiveFilename(filename)
-
 	limited := io.LimitReader(content, maxBrowseArchiveSize+1)
 	data, err := io.ReadAll(limited)
 	if err != nil {
@@ -78,17 +70,17 @@ func openArchive(filename string, content io.Reader, ecosystem string) (archives
 	}
 
 	if ecosystem == "npm" {
-		return archives.OpenBytesWithPrefix(fname, data, "package/")
+		return archives.OpenBytesWithPrefix(filename, data, "package/")
 	}
 
-	probe, err := archives.OpenBytes(fname, data)
+	probe, err := archives.OpenBytes(filename, data)
 	if err != nil {
 		return nil, err
 	}
 	prefix := detectSingleRootDir(probe)
 	_ = probe.Close()
 
-	return archives.OpenBytesWithPrefix(fname, data, prefix)
+	return archives.OpenBytesWithPrefix(filename, data, prefix)
 }
 
 // BrowseListResponse contains the file listing for a directory in an archives.
@@ -361,7 +353,14 @@ func (s *Server) browseFile(w http.ResponseWriter, r *http.Request, ecosystem, n
 	}
 	defer func() { _ = fileReader.Close() }()
 
-	contentType := detectContentType(filePath)
+	contentType, knownPath := detectContentTypeFromPath(filePath)
+	var content io.Reader = fileReader
+	if !knownPath {
+		bufferedFile := bufio.NewReaderSize(fileReader, browseSniffSize)
+		prefix, _ := bufferedFile.Peek(browseSniffSize)
+		contentType = detectContentTypeFromPrefix(prefix)
+		content = bufferedFile
+	}
 	w.Header().Set("Content-Type", contentType)
 	w.Header().Set("Content-Security-Policy", "sandbox")
 	w.Header().Set("X-Content-Type-Options", "nosniff")
@@ -370,85 +369,103 @@ func (s *Server) browseFile(w http.ResponseWriter, r *http.Request, ecosystem, n
 	w.Header().Set("Content-Disposition", fmt.Sprintf("inline; filename=%q", filename))
 
 	// Stream the file
-	_, _ = io.Copy(w, fileReader)
+	_, _ = io.Copy(w, content)
 }
 
-// detectContentType returns an appropriate content type based on file extension.
+func detectContentTypeFromPath(filename string) (string, bool) {
-func detectContentType(filename string) string {
 	ext := strings.ToLower(path.Ext(filename))
 
 	switch ext {
 	// Text formats
 	case ".txt", ".md", ".markdown":
-		return contentTypePlainText
+		return contentTypePlainText, true
 	case ".html", ".htm", ".xhtml":
-		return contentTypePlainText
+		return contentTypePlainText, true
 	case ".css":
-		return "text/css; charset=utf-8"
+		return "text/css; charset=utf-8", true
 	case ".js", ".mjs":
-		return "application/javascript; charset=utf-8"
+		return "application/javascript; charset=utf-8", true
 	case ".json":
-		return "application/json; charset=utf-8"
+		return "application/json; charset=utf-8", true
 	case ".xml":
-		return "application/xml; charset=utf-8"
+		return "application/xml; charset=utf-8", true
 	case ".yaml", ".yml":
-		return "text/yaml; charset=utf-8"
+		return "text/yaml; charset=utf-8", true
 	case ".toml":
-		return "text/toml; charset=utf-8"
+		return "text/toml; charset=utf-8", true
 
 	// Programming languages
 	case ".go":
-		return "text/x-go; charset=utf-8"
+		return "text/x-go; charset=utf-8", true
 	case ".rs":
-		return "text/x-rust; charset=utf-8"
+		return "text/x-rust; charset=utf-8", true
 	case ".py":
-		return "text/x-python; charset=utf-8"
+		return "text/x-python; charset=utf-8", true
 	case ".rb":
-		return "text/x-ruby; charset=utf-8"
+		return "text/x-ruby; charset=utf-8", true
 	case ".java":
-		return "text/x-java; charset=utf-8"
+		return "text/x-java; charset=utf-8", true
 	case ".c", ".h":
-		return "text/x-c; charset=utf-8"
+		return "text/x-c; charset=utf-8", true
 	case ".cpp", ".cc", ".cxx", ".hpp":
-		return "text/x-c++; charset=utf-8"
+		return "text/x-c++; charset=utf-8", true
 	case ".ts":
-		return "text/typescript; charset=utf-8"
+		return "text/typescript; charset=utf-8", true
 	case ".tsx":
-		return "text/tsx; charset=utf-8"
+		return "text/tsx; charset=utf-8", true
 	case ".jsx":
-		return "text/jsx; charset=utf-8"
+		return "text/jsx; charset=utf-8", true
 	case ".php":
-		return "text/x-php; charset=utf-8"
+		return "text/x-php; charset=utf-8", true
 
 	// Config files
 	case ".conf", ".config", ".ini":
-		return contentTypePlainText
+		return contentTypePlainText, true
 	case ".sh", ".bash":
-		return "text/x-shellscript; charset=utf-8"
+		return "text/x-shellscript; charset=utf-8", true
 	case ".dockerfile":
-		return "text/x-dockerfile; charset=utf-8"
+		return "text/x-dockerfile; charset=utf-8", true
 
 	// Images
 	case ".png":
-		return "image/png"
+		return "image/png", true
 	case ".jpg", ".jpeg":
-		return "image/jpeg"
+		return "image/jpeg", true
 	case ".gif":
-		return "image/gif"
+		return "image/gif", true
 	case ".svg":
-		return contentTypePlainText
+		return contentTypePlainText, true
 	case ".ico":
-		return "image/x-icon"
+		return "image/x-icon", true
 
 	// Archives
 	case ".zip", ".tar", ".gz", ".bz2", ".xz":
-		return "application/octet-stream"
+		return "application/octet-stream", true
 
 	default:
-		// Try to detect if it looks like text
 		if isLikelyText(filename) {
+			return contentTypePlainText, true
+		}
+		return "", false
+	}
+}
+
+func detectContentTypeFromPrefix(prefix []byte) string {
+	result := magic.DetectPrefix(prefix)
+	if result.Kind == magic.KindText {
 		return contentTypePlainText
 	}
+
+	switch result.Format {
+	case "png":
+		return "image/png"
+	case "jpeg":
+		return "image/jpeg"
+	case "gif":
+		return "image/gif"
+	case "pdf":
+		return "application/pdf"
+	default:
 		return "application/octet-stream"
 	}
 }

internal/server/browse_bench_test.go

@@ -55,3 +55,35 @@ func BenchmarkOpenArchive(b *testing.B) {
 		})
 	}
 }
+
+func BenchmarkDetectContentType(b *testing.B) {
+	cases := []struct {
+		name      string
+		filename  string
+		prefix    []byte
+		knownPath bool
+	}{
+		{"known-path", "README.md", nil, true},
+		{"text-prefix", "artifact", bytes.Repeat([]byte("a"), browseSniffSize), false},
+		{"png-prefix", "artifact", append([]byte("\x89PNG\r\n\x1a\n"), make([]byte, browseSniffSize-8)...), false},
+	}
+
+	for _, tc := range cases {
+		b.Run(tc.name, func(b *testing.B) {
+			b.ReportAllocs()
+			var contentType string
+			if tc.knownPath {
+				for b.Loop() {
+					contentType, _ = detectContentTypeFromPath(tc.filename)
+				}
+			} else {
+				for b.Loop() {
+					contentType = detectContentTypeFromPrefix(tc.prefix)
+				}
+			}
+			if contentType == "" {
+				b.Fatal("empty content type")
+			}
+		})
+	}
+}

internal/server/browse_test.go

@@ -137,29 +137,44 @@ func TestHandleBrowseFile(t *testing.T) {
 		t.Fatalf("failed to upsert artifact: %v", err)
 	}
 
-	// Test fetching a file
+	files := []struct {
-	req := httptest.NewRequest("GET", "/ui/api/browse/npm/test-browse/1.0.0/file/README.md", nil)
+		path        string
+		content     string
+		contentType string
+	}{
+		{"README.md", "# Test Package\n", contentTypePlainText},
+		{"notes.data", "short text\n", contentTypePlainText},
+		{"logo", "\x89PNG\r\n\x1a\nimage data", "image/png"},
+		{"page", "<!DOCTYPE html><html></html>", contentTypePlainText},
+		{"misleading.txt", "\x89PNG\r\n\x1a\nimage data", contentTypePlainText},
+	}
+	for _, file := range files {
+		t.Run(file.path, func(t *testing.T) {
+			req := httptest.NewRequest("GET", "/ui/api/browse/npm/test-browse/1.0.0/file/"+file.path, nil)
 			w := httptest.NewRecorder()
 			ts.handler.ServeHTTP(w, req)
 
 			if w.Code != http.StatusOK {
 				t.Fatalf("expected status 200, got %d: %s", w.Code, w.Body.String())
 			}
-
+			if w.Body.String() != file.content {
-	body := w.Body.String()
+				t.Errorf("unexpected file content: %q", w.Body.String())
-	if body != "# Test Package\n" {
-		t.Errorf("unexpected file content: %q", body)
 			}
-
+			if got := w.Header().Get("Content-Type"); got != file.contentType {
-	// Check content type
+				t.Errorf("Content-Type = %q, want %q", got, file.contentType)
-	contentType := w.Header().Get("Content-Type")
+			}
-	if contentType != contentTypePlainText {
+			if got := w.Header().Get("Content-Security-Policy"); got != "sandbox" {
-		t.Errorf("expected text/plain content type, got %q", contentType)
+				t.Errorf("Content-Security-Policy = %q, want sandbox", got)
+			}
+			if got := w.Header().Get("X-Content-Type-Options"); got != "nosniff" {
+				t.Errorf("X-Content-Type-Options = %q, want nosniff", got)
+			}
+		})
 	}
 
 	// Test fetching non-existent file
-	req = httptest.NewRequest("GET", "/ui/api/browse/npm/test-browse/1.0.0/file/nonexistent.txt", nil)
+	req := httptest.NewRequest("GET", "/ui/api/browse/npm/test-browse/1.0.0/file/nonexistent.txt", nil)
-	w = httptest.NewRecorder()
+	w := httptest.NewRecorder()
 	ts.handler.ServeHTTP(w, req)
 
 	if w.Code != http.StatusNotFound {
@@ -167,36 +182,52 @@ func TestHandleBrowseFile(t *testing.T) {
 	}
 }
 
-func TestDetectContentType(t *testing.T) {
+func TestBrowseContentTypePolicy(t *testing.T) {
 	tests := []struct {
+		name       string
 		filename   string
+		prefix     []byte
 		expectedCT string
 	}{
-		{"file.txt", contentTypePlainText},
+		{"text extension", "file.txt", nil, contentTypePlainText},
-		{"file.md", contentTypePlainText},
+		{"markdown extension", "file.md", nil, contentTypePlainText},
-		{"file.json", "application/json; charset=utf-8"},
+		{"JSON extension", "file.json", nil, "application/json; charset=utf-8"},
-		{"file.js", "application/javascript; charset=utf-8"},
+		{"JavaScript extension", "file.js", nil, "application/javascript; charset=utf-8"},
-		{"file.go", "text/x-go; charset=utf-8"},
+		{"Go extension", "file.go", nil, "text/x-go; charset=utf-8"},
-		{"file.py", "text/x-python; charset=utf-8"},
+		{"Python extension", "file.py", nil, "text/x-python; charset=utf-8"},
-		{"file.rs", "text/x-rust; charset=utf-8"},
+		{"Rust extension", "file.rs", nil, "text/x-rust; charset=utf-8"},
-		{"file.html", contentTypePlainText},
+		{"HTML extension", "file.html", nil, contentTypePlainText},
-		{"file.htm", contentTypePlainText},
+		{"HTM extension", "file.htm", nil, contentTypePlainText},
-		{"file.xhtml", contentTypePlainText},
+		{"XHTML extension", "file.xhtml", nil, contentTypePlainText},
-		{"file.svg", contentTypePlainText},
+		{"SVG extension", "file.svg", nil, contentTypePlainText},
-		{"file.png", "image/png"},
+		{"PNG extension", "file.png", nil, "image/png"},
-		{"file.jpg", "image/jpeg"},
+		{"JPEG extension", "file.jpg", nil, "image/jpeg"},
-		{"README", contentTypePlainText},
+		{"README", "README", nil, contentTypePlainText},
-		{"LICENSE", contentTypePlainText},
+		{"LICENSE", "LICENSE", nil, contentTypePlainText},
-		{"Makefile", contentTypePlainText},
+		{"Makefile", "Makefile", nil, contentTypePlainText},
-		{".gitignore", contentTypePlainText},
+		{"gitignore", ".gitignore", nil, contentTypePlainText},
-		{"file.bin", "application/octet-stream"},
+		{"unknown empty", "file.bin", nil, "application/octet-stream"},
+		{"extensionless PNG", "asset", []byte("\x89PNG\r\n\x1a\n"), "image/png"},
+		{"extensionless JPEG", "asset", []byte("\xff\xd8\xff"), "image/jpeg"},
+		{"extensionless GIF", "asset", []byte("GIF89a"), "image/gif"},
+		{"extensionless PDF", "asset", []byte("%PDF-1.7"), "application/pdf"},
+		{"extensionless text", "asset", []byte("plain text\n"), contentTypePlainText},
+		{"extensionless HTML", "asset", []byte("<!DOCTYPE html><html></html>"), contentTypePlainText},
+		{"extensionless XML", "asset", []byte("<?xml version=\"1.0\"?><root/>"), contentTypePlainText},
+		{"extensionless SVG", "asset", []byte("<svg xmlns=\"http://www.w3.org/2000/svg\"></svg>"), contentTypePlainText},
+		{"extensionless ZIP", "asset", []byte("PK\x03\x04"), "application/octet-stream"},
+		{"extensionless binary", "asset", []byte{0, 1, 2}, "application/octet-stream"},
+		{"known path wins", "file.txt", []byte("\x89PNG\r\n\x1a\n"), contentTypePlainText},
 	}
 
 	for _, tt := range tests {
-		t.Run(tt.filename, func(t *testing.T) {
+		t.Run(tt.name, func(t *testing.T) {
-			got := detectContentType(tt.filename)
+			got, knownPath := detectContentTypeFromPath(tt.filename)
+			if !knownPath {
+				got = detectContentTypeFromPrefix(tt.prefix)
+			}
 			if got != tt.expectedCT {
-				t.Errorf("detectContentType(%q) = %q, want %q", tt.filename, got, tt.expectedCT)
+				t.Errorf("content type for %q with prefix %q = %q, want %q", tt.filename, tt.prefix, got, tt.expectedCT)
 			}
 		})
 	}
@@ -255,6 +286,10 @@ func createTestArchive(t *testing.T) []byte {
 		"package/lib/index.js":       "module.exports = {};",
 		"package/lib/helper.js":      "module.exports.help = () => {};",
 		"package/test/index.test.js": "// tests",
+		"package/notes.data":         "short text\n",
+		"package/logo":               "\x89PNG\r\n\x1a\nimage data",
+		"package/page":               "<!DOCTYPE html><html></html>",
+		"package/misleading.txt":     "\x89PNG\r\n\x1a\nimage data",
 	}
 
 	for path, content := range files {
@@ -609,25 +644,19 @@ func TestHandleComparePage(t *testing.T) {
 	}
 }
 
-func TestArchiveFilename(t *testing.T) {
+func TestOpenArchiveDetectsExtensionlessTarGz(t *testing.T) {
-	tests := []struct {
+	reader, err := openArchive("artifact", bytes.NewReader(createTestArchive(t)), "npm")
-		input string
+	if err != nil {
-		want  string
+		t.Fatalf("openArchive failed: %v", err)
-	}{
-		{"package.tar.gz", "package.tar.gz"},
-		{"d2e2f014ccd6ec9fae8dbe6336a4164346a2a856", "d2e2f014ccd6ec9fae8dbe6336a4164346a2a856.zip"},
-		{"file.zip", "file.zip"},
-		{"archive.tgz", "archive.tgz"},
-		{"noext", "noext.zip"},
 	}
+	defer func() { _ = reader.Close() }()
 
-	for _, tt := range tests {
+	files, err := reader.List()
-		t.Run(tt.input, func(t *testing.T) {
+	if err != nil {
-			got := archiveFilename(tt.input)
+		t.Fatalf("List failed: %v", err)
-			if got != tt.want {
-				t.Errorf("archiveFilename(%q) = %q, want %q", tt.input, got, tt.want)
 	}
-		})
+	if len(files) == 0 {
+		t.Fatal("expected files in extensionless archive")
 	}
 }
 

internal/server/server.go

@@ -167,6 +167,7 @@ func (s *Server) Start() error {
 	}
 	proxy := handler.NewProxy(s.db, s.storage, fetcher, resolver, s.logger)
 	proxy.HTTPClient.Timeout = s.cfg.ParseHTTPTimeout()
+	proxy.AuthForURL = s.authForURL
 	proxy.Cooldown = cd
 	proxy.CacheMetadata = s.cfg.CacheMetadata
 	proxy.MetadataTTL = s.cfg.ParseMetadataTTL()
@@ -196,8 +197,13 @@ func (s *Server) Start() error {
 	})
 
 	// Mount protocol handlers
-	npmHandler := handler.NewNPMHandler(proxy, s.cfg.BaseURL)
+	npmHandler := handler.NewNPMHandler(proxy, s.cfg.BaseURL, s.cfg.Upstream.NPM)
-	cargoHandler := handler.NewCargoHandler(proxy, s.cfg.BaseURL)
+	cargoHandler := handler.NewCargoHandler(
+		proxy,
+		s.cfg.BaseURL,
+		s.cfg.Upstream.Cargo,
+		s.cfg.Upstream.CargoDownload,
+	)
 	gemHandler := handler.NewGemHandler(proxy, s.cfg.BaseURL)
 	goHandler := handler.NewGoHandler(proxy, s.cfg.BaseURL)
 	hexHandler := handler.NewHexHandler(proxy, s.cfg.BaseURL)

internal/server/server_test.go

@@ -67,8 +67,13 @@ func newTestServer(t *testing.T) *testServer {
 	r := chi.NewRouter()
 
 	// Mount handlers
-	npmHandler := handler.NewNPMHandler(proxy, cfg.BaseURL)
+	npmHandler := handler.NewNPMHandler(proxy, cfg.BaseURL, cfg.Upstream.NPM)
-	cargoHandler := handler.NewCargoHandler(proxy, cfg.BaseURL)
+	cargoHandler := handler.NewCargoHandler(
+		proxy,
+		cfg.BaseURL,
+		cfg.Upstream.Cargo,
+		cfg.Upstream.CargoDownload,
+	)
 	gemHandler := handler.NewGemHandler(proxy, cfg.BaseURL)
 	goHandler := handler.NewGoHandler(proxy, cfg.BaseURL)
 	pypiHandler := handler.NewPyPIHandler(proxy, cfg.BaseURL)