chore: update @actions dependencies and refresh license cache

Agent-Logs-Url: https://github.com/actions/setup-go/sessions/0e15a7f6-9e3f-4b17-98fc-7c6501a56b31 Co-authored-by: priyagupta108 <147705955+priyagupta108@users.noreply.github.com>
docs: fix Microsoft build of Go link (#734 )
2026-04-10 01:37:33 +08:00 · 2026-04-09 07:21:27 +00:00 · 2026-03-17 14:02:21 -05:00 · 2026-03-16 12:43:44 -05:00
29 changed files with 32399 additions and 85403 deletions
--- a/.github/workflows/microsoft-validation.yml
+++ b/.github/workflows/microsoft-validation.yml
@@ -0,0 +1,143 @@
+name: Validate Microsoft build of Go
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
+
+jobs:
+  microsoft-basic:
+    name: 'Microsoft build of Go ${{ matrix.go-version }} on ${{ matrix.os }}'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        go-version: ['1.25', '1.24']
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Setup Microsoft build of Go ${{ matrix.go-version }}
+        uses: ./
+        with:
+          go-version: ${{ matrix.go-version }}
+          go-download-base-url: 'https://aka.ms/golang/release/latest'
+          cache: false
+
+      - name: Verify Go installation
+        run: go version
+
+      - name: Verify Go env
+        run: go env
+
+      - name: Verify Go is functional
+        shell: bash
+        run: |
+          # Create a simple Go program and run it
+          mkdir -p /tmp/test-go && cd /tmp/test-go
+          cat > main.go << 'EOF'
+          package main
+          import "fmt"
+          func main() {
+            fmt.Println("Hello from Microsoft build of Go!")
+          }
+          EOF
+          go run main.go
+
+  microsoft-env-var:
+    name: 'Microsoft build of Go via env var on ${{ matrix.os }}'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    env:
+      GO_DOWNLOAD_BASE_URL: 'https://aka.ms/golang/release/latest'
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Setup Microsoft build of Go via environment variable
+        uses: ./
+        with:
+          go-version: '1.25'
+          cache: false
+
+      - name: Verify Go installation
+        run: go version
+
+      - name: Verify Go is functional
+        shell: bash
+        run: |
+          mkdir -p /tmp/test-go && cd /tmp/test-go
+          cat > main.go << 'EOF'
+          package main
+          import "fmt"
+          func main() {
+            fmt.Println("Hello from Microsoft build of Go via env var!")
+          }
+          EOF
+          go run main.go
+
+  microsoft-architecture:
+    name: 'Microsoft build of Go arch ${{ matrix.architecture }} on ${{ matrix.os }}'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        architecture: [x64]
+        include:
+          - os: macos-latest
+            architecture: arm64
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Setup Microsoft build of Go with architecture
+        uses: ./
+        with:
+          go-version: '1.25'
+          go-download-base-url: 'https://aka.ms/golang/release/latest'
+          architecture: ${{ matrix.architecture }}
+          cache: false
+
+      - name: Verify Go installation
+        run: go version
+
+  microsoft-with-cache:
+    name: 'Microsoft build of Go with caching on ${{ matrix.os }}'
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Setup Microsoft build of Go with caching
+        uses: ./
+        with:
+          go-version: '1.25'
+          go-download-base-url: 'https://aka.ms/golang/release/latest'
+          cache: true
+
+      - name: Verify Go installation
+        run: go version
+
+      - name: Verify Go is functional
+        shell: bash
+        run: |
+          mkdir -p /tmp/test-go && cd /tmp/test-go
+          go mod init test
+          cat > main.go << 'EOF'
+          package main
+          import "fmt"
+          func main() {
+            fmt.Println("Hello from cached Microsoft build of Go!")
+          }
+          EOF
+          go run main.go
--- a/.licenses/npm/@actions/cache.dep.yml
+++ b/.licenses/npm/@actions/cache.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: "@actions/cache"
-version: 5.0.1
+version: 5.0.5
 type: npm
 summary: Actions cache lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/cache
--- a/.licenses/npm/@actions/core-1.11.1.dep.yml
+++ b/.licenses/npm/@actions/core-1.11.1.dep.yml
@@ -1,20 +0,0 @@
---
-name: "@actions/core"
-version: 1.11.1
-type: npm
-summary: Actions core lib
-homepage: https://github.com/actions/toolkit/tree/main/packages/core
-license: mit
-licenses:
- sources: LICENSE.md
-  text: |-
-    The MIT License (MIT)
-
-    Copyright 2019 GitHub
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-notices: []
--- a/.licenses/npm/@actions/core-2.0.1.dep.yml
+++ b/.licenses/npm/@actions/core-2.0.1.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: "@actions/core"
-version: 2.0.1
+version: 2.0.3
 type: npm
 summary: Actions core lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/core
--- a/.licenses/npm/@actions/exec-1.1.1.dep.yml
+++ b/.licenses/npm/@actions/exec-1.1.1.dep.yml
@@ -1,20 +0,0 @@
---
-name: "@actions/exec"
-version: 1.1.1
-type: npm
-summary: Actions exec lib
-homepage: https://github.com/actions/toolkit/tree/main/packages/exec
-license: mit
-licenses:
- sources: LICENSE.md
-  text: |-
-    The MIT License (MIT)
-
-    Copyright 2019 GitHub
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-notices: []
--- a/.licenses/npm/@actions/exec-2.0.0.dep.yml
+++ b/.licenses/npm/@actions/exec-2.0.0.dep.yml
--- a/.licenses/npm/@actions/glob.dep.yml
+++ b/.licenses/npm/@actions/glob.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: "@actions/glob"
-version: 0.5.0
+version: 0.5.1
 type: npm
 summary: Actions glob lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/glob
--- a/.licenses/npm/@actions/http-client-2.2.3.dep.yml
+++ b/.licenses/npm/@actions/http-client-2.2.3.dep.yml
@@ -1,32 +0,0 @@
---
-name: "@actions/http-client"
-version: 2.2.3
-type: npm
-summary: Actions Http Client
-homepage: https://github.com/actions/toolkit/tree/main/packages/http-client
-license: mit
-licenses:
- sources: LICENSE
-  text: |
-    Actions Http Client for Node.js
-
-    Copyright (c) GitHub, Inc.
-
-    All rights reserved.
-
-    MIT License
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
-    associated documentation files (the "Software"), to deal in the Software without restriction,
-    including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
-    and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
-    subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
-    LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
-    NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
-    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-notices: []
--- a/.licenses/npm/@actions/http-client-3.0.2.dep.yml
+++ b/.licenses/npm/@actions/http-client-3.0.2.dep.yml
--- a/.licenses/npm/@actions/io-1.1.3.dep.yml
+++ b/.licenses/npm/@actions/io-1.1.3.dep.yml
@@ -1,20 +0,0 @@
---
-name: "@actions/io"
-version: 1.1.3
-type: npm
-summary: Actions io lib
-homepage: https://github.com/actions/toolkit/tree/main/packages/io
-license: mit
-licenses:
- sources: LICENSE.md
-  text: |-
-    The MIT License (MIT)
-
-    Copyright 2019 GitHub
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-notices: []
--- a/.licenses/npm/@actions/io-2.0.0.dep.yml
+++ b/.licenses/npm/@actions/io-2.0.0.dep.yml
--- a/.licenses/npm/@actions/tool-cache.dep.yml
+++ b/.licenses/npm/@actions/tool-cache.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: "@actions/tool-cache"
-version: 2.0.2
+version: 3.0.1
 type: npm
 summary: Actions tool-cache lib
 homepage: https://github.com/actions/toolkit/tree/main/packages/tool-cache
--- a/.licenses/npm/@fastify/busboy.dep.yml
+++ b/.licenses/npm/@fastify/busboy.dep.yml
@@ -1,30 +0,0 @@
---
-name: "@fastify/busboy"
-version: 2.1.1
-type: npm
-summary: A streaming parser for HTML form data for node.js
-homepage:
-license: mit
-licenses:
- sources: LICENSE
-  text: |-
-    Copyright Brian White. All rights reserved.
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy
-    of this software and associated documentation files (the "Software"), to
-    deal in the Software without restriction, including without limitation the
-    rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
-    sell copies of the Software, and to permit persons to whom the Software is
-    furnished to do so, subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in
-    all copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
-    IN THE SOFTWARE.
-notices: []
--- a/.licenses/npm/brace-expansion.dep.yml
+++ b/.licenses/npm/brace-expansion.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: brace-expansion
-version: 1.1.12
+version: 1.1.13
 type: npm
 summary: Brace expansion as known from sh/bash
 homepage: https://github.com/juliangruber/brace-expansion
--- a/.licenses/npm/fast-xml-builder.dep.yml
+++ b/.licenses/npm/fast-xml-builder.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: fast-xml-builder
-version: 1.0.0
+version: 1.1.4
 type: npm
 summary: Build XML from JSON without C/C++ based libraries
 homepage:
--- a/.licenses/npm/fast-xml-parser.dep.yml
+++ b/.licenses/npm/fast-xml-parser.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: fast-xml-parser
-version: 5.4.1
+version: 5.5.11
 type: npm
 summary: Validate XML, Parse XML, Build XML without C/C++ based libraries
 homepage:
--- a/.licenses/npm/path-expression-matcher.dep.yml
+++ b/.licenses/npm/path-expression-matcher.dep.yml
@@ -1,16 +1,16 @@
 ---
-name: undici
-version: 6.23.0
+name: path-expression-matcher
+version: 1.4.0
 type: npm
-summary: An HTTP/1.1 client, written from scratch for Node.js
-homepage: https://undici.nodejs.org
+summary: Efficient path tracking and pattern matching for XML/JSON parsers
+homepage: https://github.com/NaturalIntelligence/path-expression-matcher#readme
 license: mit
 licenses:
 - sources: LICENSE
  text: |
    MIT License

-    Copyright (c) Matteo Collina and Undici contributors
+    Copyright (c) 2024

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
@@ -29,6 +29,4 @@ licenses:
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.
- sources: README.md
-  text: MIT
 notices: []
--- a/.licenses/npm/strnum.dep.yml
+++ b/.licenses/npm/strnum.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: strnum
-version: 2.1.2
+version: 2.2.3
 type: npm
 summary: Parse String to Number based on configuration
 homepage:
--- a/.licenses/npm/undici-5.29.0.dep.yml
+++ b/.licenses/npm/undici-5.29.0.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: undici
-version: 5.29.0
+version: 6.24.1
 type: npm
 summary: An HTTP/1.1 client, written from scratch for Node.js
 homepage: https://undici.nodejs.org
--- a/README.md
+++ b/README.md
@@ -54,6 +54,9 @@ See [action.yml](action.yml).
    
    # Architecture to install (auto-detected if not specified)
    architecture: 'x64'
+    
+    # Custom base URL for Go downloads (e.g., for mirrors)
+    go-download-base-url: ''
 ```
 <!-- end usage -->

@@ -130,6 +133,7 @@ For examples of using `cache-dependency-path`, see the [Caching](docs/advanced-u
 - [Check latest version](docs/advanced-usage.md#check-latest-version)
 - [Caching](docs/advanced-usage.md#caching)
 - [Outputs](docs/advanced-usage.md#outputs)
+- [Custom download URL](docs/advanced-usage.md#custom-download-url)
 - [Using `setup-go` on GHES](docs/advanced-usage.md#using-setup-go-on-ghes)

 ## License
--- a/tests/setup-go.test.ts
+++ b/tests/setup-go.test.ts
@@ -45,6 +45,7 @@ describe('setup-go', () => {
  let mkdirSpy: jest.SpyInstance;
  let symlinkSpy: jest.SpyInstance;
  let execSpy: jest.SpyInstance;
+  let execFileSpy: jest.SpyInstance;
  let getManifestSpy: jest.SpyInstance;
  let getAllVersionsSpy: jest.SpyInstance;
  let httpmGetJsonSpy: jest.SpyInstance;
@@ -71,6 +72,10 @@ describe('setup-go', () => {
    archSpy = jest.spyOn(osm, 'arch');
    archSpy.mockImplementation(() => os['arch']);
    execSpy = jest.spyOn(cp, 'execSync');
+    execFileSpy = jest.spyOn(cp, 'execFileSync');
+    execFileSpy.mockImplementation(() => {
+      throw new Error('ENOENT');
+    });

    // switch path join behaviour based on set os.platform
    joinSpy = jest.spyOn(path, 'join');
@@ -129,8 +134,9 @@ describe('setup-go', () => {
  });

  afterEach(() => {
-    // clear out env var set during 'run'
+    // clear out env vars set during 'run'
    delete process.env[im.GOTOOLCHAIN_ENV_VAR];
+    delete process.env['GO_DOWNLOAD_BASE_URL'];

    //jest.resetAllMocks();
    jest.clearAllMocks();
@@ -1105,4 +1111,456 @@ use .
    expect(vars).toStrictEqual({GOTOOLCHAIN: 'local'});
    expect(process.env).toHaveProperty('GOTOOLCHAIN', 'local');
  });
+
+  describe('go-download-base-url', () => {
+    it('downloads a version from custom base URL using version listing', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.13.1';
+      const customBaseUrl = 'https://example.com/golang';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.13.1/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      const expPath = path.join(toolPath, 'bin');
+      expect(logSpy).toHaveBeenCalledWith(
+        `Using custom Go download base URL: ${customBaseUrl}`
+      );
+      expect(logSpy).toHaveBeenCalledWith('Install from custom download URL');
+      // Version listing should use custom base URL, not go.dev
+      expect(getSpy).toHaveBeenCalledWith(
+        `${customBaseUrl}/?mode=json&include=all`
+      );
+      expect(dlSpy).toHaveBeenCalled();
+      expect(extractTarSpy).toHaveBeenCalled();
+      expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    });
+
+    it('skips version listing for known direct-download URL (aka.ms)', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.25.0';
+      const customBaseUrl = 'https://aka.ms/golang/release/latest';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.25.0/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      const expPath = path.join(toolPath, 'bin');
+      expect(logSpy).toHaveBeenCalledWith(
+        'Skipping version listing for known direct-download URL. Constructing download URL directly.'
+      );
+      expect(logSpy).toHaveBeenCalledWith(
+        `Constructed direct download URL: ${customBaseUrl}/go1.25.0.linux-amd64.tar.gz`
+      );
+      expect(logSpy).toHaveBeenCalledWith('Install from custom download URL');
+      expect(getSpy).not.toHaveBeenCalled();
+      expect(dlSpy).toHaveBeenCalled();
+      expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    });
+
+    it('constructs correct direct download URL for windows (aka.ms)', async () => {
+      os.platform = 'win32';
+      os.arch = 'x64';
+
+      const versionSpec = '1.25.0';
+      const customBaseUrl = 'https://aka.ms/golang/release/latest';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+      process.env['RUNNER_TEMP'] = 'C:\\temp\\';
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => 'C:\\temp\\some\\path');
+      extractZipSpy.mockImplementation(() => 'C:\\temp\\some\\other\\path');
+      const toolPath = path.normalize('C:\\cache\\go\\1.25.0\\x64');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      expect(getSpy).not.toHaveBeenCalled();
+      expect(dlSpy).toHaveBeenCalledWith(
+        `${customBaseUrl}/go1.25.0.windows-amd64.zip`,
+        'C:\\temp\\go1.25.0.windows-amd64.zip',
+        undefined
+      );
+    });
+
+    it('skips manifest and downloads directly from custom URL', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.12.16';
+      const customBaseUrl = 'https://example.com/golang';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+      inputs['token'] = 'faketoken';
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.12.16/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      // Should not try to use the manifest at all
+      expect(logSpy).not.toHaveBeenCalledWith(
+        expect.stringContaining('Not found in manifest')
+      );
+      expect(logSpy).toHaveBeenCalledWith('Install from custom download URL');
+    });
+
+    it('strips trailing slashes from custom base URL', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.13.1';
+      const customBaseUrl = 'https://example.com/golang/';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.13.1/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith(
+        `Acquiring go1.13.1 from https://example.com/golang/go1.13.1.linux-amd64.tar.gz`
+      );
+    });
+
+    it('reads custom base URL from environment variable', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.13.1';
+      const customBaseUrl = 'https://example.com/golang';
+
+      inputs['go-version'] = versionSpec;
+      process.env['GO_DOWNLOAD_BASE_URL'] = customBaseUrl;
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.13.1/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith(
+        `Using custom Go download base URL: ${customBaseUrl}`
+      );
+      expect(logSpy).toHaveBeenCalledWith('Install from custom download URL');
+    });
+
+    it('input takes precedence over environment variable', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.13.1';
+      const inputUrl = 'https://input.example.com/golang';
+      const envUrl = 'https://env.example.com/golang';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = inputUrl;
+      process.env['GO_DOWNLOAD_BASE_URL'] = envUrl;
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.13.1/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith(
+        `Using custom Go download base URL: ${inputUrl}`
+      );
+      expect(logSpy).toHaveBeenCalledWith(
+        `Acquiring go1.13.1 from ${inputUrl}/go1.13.1.linux-amd64.tar.gz`
+      );
+    });
+
+    it('errors when stable alias is used with custom URL', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      inputs['go-version'] = 'stable';
+      inputs['go-download-base-url'] = 'https://example.com/golang';
+
+      findSpy.mockImplementation(() => '');
+      await main.run();
+
+      expect(cnSpy).toHaveBeenCalledWith(
+        `::error::Version aliases 'stable' are not supported with a custom download base URL. Please specify an exact Go version.${osm.EOL}`
+      );
+    });
+
+    it('logs info when check-latest is used with custom URL', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.13.1';
+      const customBaseUrl = 'https://example.com/golang';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+      inputs['check-latest'] = true;
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      const toolPath = path.normalize('/cache/go/1.13.1/x64');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith(
+        'check-latest is not supported with a custom download base URL. Using the provided version spec directly.'
+      );
+    });
+
+    it('constructs direct download info correctly', () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const info = im.getInfoFromDirectDownload(
+        '1.25.0',
+        'x64',
+        'https://aka.ms/golang/release/latest'
+      );
+
+      expect(info.type).toBe('dist');
+      expect(info.downloadUrl).toBe(
+        'https://aka.ms/golang/release/latest/go1.25.0.linux-amd64.tar.gz'
+      );
+      expect(info.fileName).toBe('go1.25.0.linux-amd64.tar.gz');
+      expect(info.resolvedVersion).toBe('1.25.0');
+    });
+
+    it('constructs direct download info for windows', () => {
+      os.platform = 'win32';
+      os.arch = 'x64';
+
+      const info = im.getInfoFromDirectDownload(
+        '1.25.0',
+        'x64',
+        'https://aka.ms/golang/release/latest'
+      );
+
+      expect(info.type).toBe('dist');
+      expect(info.downloadUrl).toBe(
+        'https://aka.ms/golang/release/latest/go1.25.0.windows-amd64.zip'
+      );
+      expect(info.fileName).toBe('go1.25.0.windows-amd64.zip');
+    });
+
+    it('constructs direct download info for arm64', () => {
+      os.platform = 'darwin';
+      os.arch = 'arm64';
+
+      const info = im.getInfoFromDirectDownload(
+        '1.25.0',
+        'arm64',
+        'https://aka.ms/golang/release/latest'
+      );
+
+      expect(info.type).toBe('dist');
+      expect(info.downloadUrl).toBe(
+        'https://aka.ms/golang/release/latest/go1.25.0.darwin-arm64.tar.gz'
+      );
+      expect(info.fileName).toBe('go1.25.0.darwin-arm64.tar.gz');
+    });
+
+    it('caches under actual installed version when it differs from input spec', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.20';
+      const customBaseUrl = 'https://aka.ms/golang/release/latest';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+
+      // Mock the installed Go binary reporting a different patch version
+      execFileSpy.mockImplementation(() => 'go version go1.20.14 linux/amd64');
+
+      const expectedToolName = im.customToolCacheName(customBaseUrl);
+      const toolPath = path.normalize(`/cache/${expectedToolName}/1.20.14/x64`);
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      expect(logSpy).toHaveBeenCalledWith(
+        "Requested version '1.20' resolved to installed version '1.20.14'"
+      );
+      // Cache key should use actual version, not the input spec
+      expect(cacheSpy).toHaveBeenCalledWith(
+        expect.any(String),
+        expectedToolName,
+        '1.20.14',
+        'x64'
+      );
+    });
+
+    it('shows clear error with platform/arch and URL on 404', async () => {
+      os.platform = 'linux';
+      os.arch = 'arm64';
+
+      const versionSpec = '1.25.0';
+      const customBaseUrl = 'https://example.com/golang';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+
+      getSpy.mockImplementationOnce(() => {
+        throw new Error('Not a JSON endpoint');
+      });
+
+      findSpy.mockImplementation(() => '');
+      const httpError = new tc.HTTPError(404);
+      dlSpy.mockImplementation(() => {
+        throw httpError;
+      });
+
+      await main.run();
+
+      expect(cnSpy).toHaveBeenCalledWith(
+        expect.stringContaining(
+          'The requested Go version 1.25.0 is not available for platform linux/arm64'
+        )
+      );
+      expect(cnSpy).toHaveBeenCalledWith(expect.stringContaining('HTTP 404'));
+    });
+
+    it('shows clear error with platform/arch and URL on download failure', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.25.0';
+      const customBaseUrl = 'https://example.com/golang';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+
+      getSpy.mockImplementationOnce(() => {
+        throw new Error('Not a JSON endpoint');
+      });
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(() => {
+        throw new Error('connection refused');
+      });
+
+      await main.run();
+
+      expect(cnSpy).toHaveBeenCalledWith(
+        expect.stringContaining(
+          'Failed to download Go 1.25.0 for platform linux/x64'
+        )
+      );
+      expect(cnSpy).toHaveBeenCalledWith(
+        expect.stringContaining(customBaseUrl)
+      );
+    });
+
+    it.each(['^1.25.0', '~1.25', '>=1.25.0', '<1.26.0', '1.25.x', '1.x'])(
+      'errors on version range "%s" when version listing is unavailable',
+      async versionSpec => {
+        os.platform = 'linux';
+        os.arch = 'x64';
+
+        inputs['go-version'] = versionSpec;
+        inputs['go-download-base-url'] = 'https://example.com/golang';
+
+        // Simulate version listing not available
+        getSpy.mockImplementationOnce(() => {
+          throw new Error('Not a JSON endpoint');
+        });
+
+        findSpy.mockImplementation(() => '');
+
+        await main.run();
+
+        expect(cnSpy).toHaveBeenCalledWith(
+          expect.stringContaining(
+            `Version range '${versionSpec}' is not supported with a custom download base URL`
+          )
+        );
+      }
+    );
+
+    it('rejects version range in getInfoFromDirectDownload', () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      expect(() =>
+        im.getInfoFromDirectDownload(
+          '^1.25.0',
+          'x64',
+          'https://example.com/golang'
+        )
+      ).toThrow(
+        "Version range '^1.25.0' is not supported with a custom download base URL"
+      );
+    });
+
+    it('passes token as auth header for custom URL downloads', async () => {
+      os.platform = 'linux';
+      os.arch = 'x64';
+
+      const versionSpec = '1.25.0';
+      const customBaseUrl = 'https://private-mirror.example.com/golang';
+
+      inputs['go-version'] = versionSpec;
+      inputs['go-download-base-url'] = customBaseUrl;
+      inputs['token'] = 'ghp_testtoken123';
+
+      getSpy.mockImplementationOnce(() => {
+        throw new Error('Not a JSON endpoint');
+      });
+
+      findSpy.mockImplementation(() => '');
+      dlSpy.mockImplementation(async () => '/some/temp/path');
+      extractTarSpy.mockImplementation(async () => '/some/other/temp/path');
+      const expectedToolName = im.customToolCacheName(customBaseUrl);
+      const toolPath = path.normalize(`/cache/${expectedToolName}/1.25.0/x64`);
+      cacheSpy.mockImplementation(async () => toolPath);
+
+      await main.run();
+
+      expect(dlSpy).toHaveBeenCalledWith(
+        `${customBaseUrl}/go1.25.0.linux-amd64.tar.gz`,
+        undefined,
+        'token ghp_testtoken123'
+      );
+    });
+  });
 });
--- a/action.yml
+++ b/action.yml
@@ -19,6 +19,8 @@ inputs:
    description: 'Used to specify the path to a dependency file (e.g., go.mod, go.sum)'
  architecture:
    description: 'Target architecture for Go to use. Examples: x86, x64. Will use system architecture by default.'
+  go-download-base-url:
+    description: 'Custom base URL for downloading Go distributions. Use this to download Go from a mirror or custom source. Defaults to "https://go.dev/dl". Can also be set via the GO_DOWNLOAD_BASE_URL environment variable. The input takes precedence over the environment variable.'
 outputs:
  go-version:
    description: 'The installed Go version. Useful when given a version range as input.'
--- a/dist/cache-save/index.js
+++ b/dist/cache-save/index.js
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
--- a/docs/advanced-usage.md
+++ b/docs/advanced-usage.md
@@ -12,6 +12,7 @@
  - [Restore-only caches](advanced-usage.md#restore-only-caches)
  - [Parallel builds](advanced-usage.md#parallel-builds)
 - [Outputs](advanced-usage.md#outputs)
+- [Custom download URL](advanced-usage.md#custom-download-url)
 - [Using `setup-go` on GHES](advanced-usage.md#using-setup-go-on-ghes)

 ## Using the `go-version` input
@@ -222,6 +223,8 @@ want the most up-to-date Go version to always be used. It supports major (e.g.,

 > Setting `check-latest` to `true` has performance implications as downloading Go versions is slower than using cached
 > versions.
+>
+> `check-latest` is ignored when `go-download-base-url` is set. See [Custom download URL](#custom-download-url) for details.

 ```yaml
 steps:
@@ -417,6 +420,57 @@ jobs:
      - run: echo "Was the Go cache restored? ${{ steps.go124.outputs.cache-hit }}" # true if cache-hit occurred
 ```

+## Custom download URL
+
+The `go-download-base-url` input lets you download Go from a mirror or alternative source instead of the default `https://go.dev/dl`. This can also be set via the `GO_DOWNLOAD_BASE_URL` environment variable; the input takes precedence over the environment variable.
+
+When a custom base URL is provided, the action skips the `actions/go-versions` manifest lookup and downloads directly from the specified URL.
+
+**Using the [Microsoft build of Go](https://github.com/microsoft/go):**
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: '1.25'
+      go-download-base-url: 'https://aka.ms/golang/release/latest'
+  - run: go version
+```
+
+**Using an environment variable:**
+
+```yaml
+env:
+  GO_DOWNLOAD_BASE_URL: 'https://aka.ms/golang/release/latest'
+
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: '1.25'
+  - run: go version
+```
+
+> **Note:** Version range syntax (`^1.25`, `~1.24`, `>=1.25.0`) and aliases (`stable`, `oldstable`) are not supported with custom download URLs. Use exact versions such as `1.25`, `1.25.0`, or `1.25.0-1` (for sources that use revision numbers). If the custom server provides a version listing endpoint (`/?mode=json&include=all`), semver ranges will work; otherwise only exact versions are accepted.
+
+> **Note:** The `check-latest` option is ignored when a custom download base URL is set. The action cannot query the custom server for the latest version, so it uses the version you specify directly. If you provide a partial version like `1.25`, the server determines which patch release to serve.
+
+**Authenticated downloads:**
+
+If your custom download source requires authentication, the `token` input is forwarded as an `Authorization` header. For example, to download from a private mirror:
+
+```yaml
+steps:
+  - uses: actions/checkout@v6
+  - uses: actions/setup-go@v6
+    with:
+      go-version: '1.25'
+      go-download-base-url: 'https://private-mirror.example.com/golang'
+      token: ${{ secrets.MIRROR_TOKEN }}
+  - run: go version
+```
+
 ## Using `setup-go` on GHES

 ### Avoiding rate limit issues
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,13 +9,13 @@
      "version": "6.2.0",
      "license": "MIT",
      "dependencies": {
-        "@actions/cache": "^5.0.1",
-        "@actions/core": "^1.11.1",
-        "@actions/exec": "^1.1.1",
-        "@actions/glob": "^0.5.0",
-        "@actions/http-client": "^4.0.0",
-        "@actions/io": "^1.0.2",
-        "@actions/tool-cache": "^2.0.2",
+        "@actions/cache": "^5.0.5",
+        "@actions/core": "^2.0.3",
+        "@actions/exec": "^2.0.0",
+        "@actions/glob": "^0.5.1",
+        "@actions/http-client": "^3.0.2",
+        "@actions/io": "^2.0.0",
+        "@actions/tool-cache": "^3.0.1",
        "semver": "^7.7.3"
      },
      "devDependencies": {
@@ -41,14 +41,15 @@
      }
    },
    "node_modules/@actions/cache": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/@actions/cache/-/cache-5.0.1.tgz",
-      "integrity": "sha512-c+oH047Z2zmXLhjMZfEKjxZfv6Ou7T0sn5fhz6yupICXm5OOR47oZn5zxNO8MP7ttkxv5TOg3WsMrffri5Xhfw==",
+      "version": "5.0.5",
+      "resolved": "https://registry.npmjs.org/@actions/cache/-/cache-5.0.5.tgz",
+      "integrity": "sha512-jiQSg0gfd+C2KPgcmdCOq7dCuCIQQWQ4b1YfGIRaaA9w7PJbRwTOcCz4LiFEUnqZGf0ha/8OKL3BeNwetHzYsQ==",
+      "license": "MIT",
      "dependencies": {
        "@actions/core": "^2.0.0",
        "@actions/exec": "^2.0.0",
-        "@actions/glob": "^0.5.0",
-        "@actions/http-client": "^3.0.0",
+        "@actions/glob": "^0.5.1",
+        "@actions/http-client": "^3.0.2",
        "@actions/io": "^2.0.0",
        "@azure/abort-controller": "^1.1.0",
        "@azure/core-rest-pipeline": "^1.22.0",
@@ -57,41 +58,6 @@
        "semver": "^6.3.1"
      }
    },
-    "node_modules/@actions/cache/node_modules/@actions/core": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/@actions/core/-/core-2.0.1.tgz",
-      "integrity": "sha512-oBfqT3GwkvLlo1fjvhQLQxuwZCGTarTE5OuZ2Wg10hvhBj7LRIlF611WT4aZS6fDhO5ZKlY7lCAZTlpmyaHaeg==",
-      "license": "MIT",
-      "dependencies": {
-        "@actions/exec": "^2.0.0",
-        "@actions/http-client": "^3.0.0"
-      }
-    },
-    "node_modules/@actions/cache/node_modules/@actions/exec": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/@actions/exec/-/exec-2.0.0.tgz",
-      "integrity": "sha512-k8ngrX2voJ/RIN6r9xB82NVqKpnMRtxDoiO+g3olkIUpQNqjArXrCQceduQZCQj3P3xm32pChRLqRrtXTlqhIw==",
-      "license": "MIT",
-      "dependencies": {
-        "@actions/io": "^2.0.0"
-      }
-    },
-    "node_modules/@actions/cache/node_modules/@actions/http-client": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-3.0.2.tgz",
-      "integrity": "sha512-JP38FYYpyqvUsz+Igqlc/JG6YO9PaKuvqjM3iGvaLqFnJ7TFmcLyy2IDrY0bI0qCQug8E9K+elv5ZNfw62ZJzA==",
-      "license": "MIT",
-      "dependencies": {
-        "tunnel": "^0.0.6",
-        "undici": "^6.23.0"
-      }
-    },
-    "node_modules/@actions/cache/node_modules/@actions/io": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/@actions/io/-/io-2.0.0.tgz",
-      "integrity": "sha512-Jv33IN09XLO+0HS79aaODsvIRyduiF7NY/F6LYeK5oeUmrsz7aFdRphQjFoESF4jS7lMauDOttKALcpapVDIAg==",
-      "license": "MIT"
-    },
    "node_modules/@actions/cache/node_modules/semver": {
      "version": "6.3.1",
      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
@@ -102,60 +68,38 @@
      }
    },
    "node_modules/@actions/core": {
-      "version": "1.11.1",
-      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.11.1.tgz",
-      "integrity": "sha512-hXJCSrkwfA46Vd9Z3q4cpEpHB1rL5NG04+/rbqW9d3+CSvtB1tYe8UTpAlixa1vj0m/ULglfEK2UKxMGxCxv5A==",
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-2.0.3.tgz",
+      "integrity": "sha512-Od9Thc3T1mQJYddvVPM4QGiLUewdh+3txmDYHHxoNdkqysR1MbCT+rFOtNUxYAz+7+6RIsqipVahY2GJqGPyxA==",
      "license": "MIT",
      "dependencies": {
-        "@actions/exec": "^1.1.1",
-        "@actions/http-client": "^2.0.1"
-      }
-    },
-    "node_modules/@actions/core/node_modules/@actions/http-client": {
-      "version": "2.2.3",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.3.tgz",
-      "integrity": "sha512-mx8hyJi/hjFvbPokCg4uRd4ZX78t+YyRPtnKWwIl+RzNaVuFpQHfmlGVfsKEJN8LwTCvL+DfVgAM04XaHkm6bA==",
-      "license": "MIT",
-      "dependencies": {
-        "tunnel": "^0.0.6",
-        "undici": "^5.25.4"
-      }
-    },
-    "node_modules/@actions/core/node_modules/undici": {
-      "version": "5.29.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-5.29.0.tgz",
-      "integrity": "sha512-raqeBD6NQK4SkWhQzeYKd1KmIG6dllBOTt55Rmkt4HtI9mwdWtJljnrXjAFUBLTSN67HWrOIZ3EPF4kjUw80Bg==",
-      "license": "MIT",
-      "dependencies": {
-        "@fastify/busboy": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=14.0"
+        "@actions/exec": "^2.0.0",
+        "@actions/http-client": "^3.0.2"
      }
    },
    "node_modules/@actions/exec": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/@actions/exec/-/exec-1.1.1.tgz",
-      "integrity": "sha512-+sCcHHbVdk93a0XT19ECtO/gIXoxvdsgQLzb2fE2/5sIZmWQuluYyjPQtrtTHdU1YzTZ7bAPN4sITq2xi1679w==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@actions/exec/-/exec-2.0.0.tgz",
+      "integrity": "sha512-k8ngrX2voJ/RIN6r9xB82NVqKpnMRtxDoiO+g3olkIUpQNqjArXrCQceduQZCQj3P3xm32pChRLqRrtXTlqhIw==",
      "license": "MIT",
      "dependencies": {
-        "@actions/io": "^1.0.1"
+        "@actions/io": "^2.0.0"
      }
    },
    "node_modules/@actions/glob": {
-      "version": "0.5.0",
-      "resolved": "https://registry.npmjs.org/@actions/glob/-/glob-0.5.0.tgz",
-      "integrity": "sha512-tST2rjPvJLRZLuT9NMUtyBjvj9Yo0MiJS3ow004slMvm8GFM+Zv9HvMJ7HWzfUyJnGrJvDsYkWBaaG3YKXRtCw==",
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/@actions/glob/-/glob-0.5.1.tgz",
+      "integrity": "sha512-+dv/t2aKQdKp9WWSp+1yIXVJzH5Q38M0Mta26pzIbeec14EcIleMB7UU6N7sNgbEuYfyuVGpE5pOKjl6j1WXkA==",
      "license": "MIT",
      "dependencies": {
-        "@actions/core": "^1.9.1",
+        "@actions/core": "^2.0.3",
        "minimatch": "^3.0.4"
      }
    },
    "node_modules/@actions/http-client": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-4.0.0.tgz",
-      "integrity": "sha512-QuwPsgVMsD6qaPD57GLZi9sqzAZCtiJT8kVBCDpLtxhL5MydQ4gS+DrejtZZPdIYyB1e95uCK9Luyds7ybHI3g==",
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-3.0.2.tgz",
+      "integrity": "sha512-JP38FYYpyqvUsz+Igqlc/JG6YO9PaKuvqjM3iGvaLqFnJ7TFmcLyy2IDrY0bI0qCQug8E9K+elv5ZNfw62ZJzA==",
      "license": "MIT",
      "dependencies": {
        "tunnel": "^0.0.6",
@@ -163,34 +107,24 @@
      }
    },
    "node_modules/@actions/io": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/@actions/io/-/io-1.1.3.tgz",
-      "integrity": "sha512-wi9JjgKLYS7U/z8PPbco+PvTb/nRWjeoFlJ1Qer83k/3C5PHQi28hiVdeE2kHXmIL99mQFawx8qt/JPjZilJ8Q==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@actions/io/-/io-2.0.0.tgz",
+      "integrity": "sha512-Jv33IN09XLO+0HS79aaODsvIRyduiF7NY/F6LYeK5oeUmrsz7aFdRphQjFoESF4jS7lMauDOttKALcpapVDIAg==",
      "license": "MIT"
    },
    "node_modules/@actions/tool-cache": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/@actions/tool-cache/-/tool-cache-2.0.2.tgz",
-      "integrity": "sha512-fBhNNOWxuoLxztQebpOaWu6WeVmuwa77Z+DxIZ1B+OYvGkGQon6kTVg6Z32Cb13WCuw0szqonK+hh03mJV7Z6w==",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@actions/tool-cache/-/tool-cache-3.0.1.tgz",
+      "integrity": "sha512-euK7sID37jMg1yWGkdXkLPI5Te7x/+2QMUPeHXogcpzUZ81mqlDZ+CgYhQo3LtB8LpVnnQyjs+hTTU0Ir4Y0RQ==",
      "license": "MIT",
      "dependencies": {
-        "@actions/core": "^1.11.1",
-        "@actions/exec": "^1.0.0",
-        "@actions/http-client": "^2.0.1",
-        "@actions/io": "^1.1.1",
+        "@actions/core": "^2.0.1",
+        "@actions/exec": "^2.0.0",
+        "@actions/http-client": "^3.0.2",
+        "@actions/io": "^2.0.0",
        "semver": "^6.1.0"
      }
    },
-    "node_modules/@actions/tool-cache/node_modules/@actions/http-client": {
-      "version": "2.2.3",
-      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-2.2.3.tgz",
-      "integrity": "sha512-mx8hyJi/hjFvbPokCg4uRd4ZX78t+YyRPtnKWwIl+RzNaVuFpQHfmlGVfsKEJN8LwTCvL+DfVgAM04XaHkm6bA==",
-      "license": "MIT",
-      "dependencies": {
-        "tunnel": "^0.0.6",
-        "undici": "^5.25.4"
-      }
-    },
    "node_modules/@actions/tool-cache/node_modules/semver": {
      "version": "6.3.1",
      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
@@ -200,18 +134,6 @@
        "semver": "bin/semver.js"
      }
    },
-    "node_modules/@actions/tool-cache/node_modules/undici": {
-      "version": "5.29.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-5.29.0.tgz",
-      "integrity": "sha512-raqeBD6NQK4SkWhQzeYKd1KmIG6dllBOTt55Rmkt4HtI9mwdWtJljnrXjAFUBLTSN67HWrOIZ3EPF4kjUw80Bg==",
-      "license": "MIT",
-      "dependencies": {
-        "@fastify/busboy": "^2.0.0"
-      },
-      "engines": {
-        "node": ">=14.0"
-      }
-    },
    "node_modules/@azure/abort-controller": {
      "version": "1.1.0",
      "resolved": "https://registry.npmjs.org/@azure/abort-controller/-/abort-controller-1.1.0.tgz",
@@ -1097,15 +1019,6 @@
        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
      }
    },
-    "node_modules/@fastify/busboy": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/@fastify/busboy/-/busboy-2.1.1.tgz",
-      "integrity": "sha512-vBZP4NlzfOlerQTnba4aqZoMhE/a9HY7HRqoOPaETQcSQuWEIyZMHGfVu6w9wGtGK5fED5qRs2DteVCjOH60sA==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=14"
-      }
-    },
    "node_modules/@humanwhocodes/config-array": {
      "version": "0.13.0",
      "resolved": "https://registry.npmjs.org/@humanwhocodes/config-array/-/config-array-0.13.0.tgz",
@@ -1996,9 +1909,9 @@
      }
    },
    "node_modules/@typescript-eslint/typescript-estree/node_modules/brace-expansion": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.2.tgz",
-      "integrity": "sha512-Jt0vHyM+jmUBqojB7E1NIYadt0vI0Qxjxd2TErW94wDz+E2LAm5vKMXXwg6ZZBTHPuUlDgQHKXvjGBdfcF1ZDQ==",
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.3.tgz",
+      "integrity": "sha512-MCV/fYJEbqx68aE58kv2cA/kiky1G8vux3OR6/jbS+jIMe/6fJWa0DTzJU7dqijOWYwHi1t29FlfYI9uytqlpA==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
@@ -2385,9 +2298,9 @@
      }
    },
    "node_modules/brace-expansion": {
-      "version": "1.1.12",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
-      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
+      "version": "1.1.13",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.13.tgz",
+      "integrity": "sha512-9ZLprWS6EENmhEOpjCYW2c8VkmOvckIJZfkr7rBW6dObmfgJ/L1GpSYW5Hpo9lDz4D1+n0Ckz8rU7FwHDQiG/w==",
      "license": "MIT",
      "dependencies": {
        "balanced-match": "^1.0.0",
@@ -3402,21 +3315,9 @@
      "license": "MIT"
    },
    "node_modules/fast-xml-builder": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/fast-xml-builder/-/fast-xml-builder-1.0.0.tgz",
-      "integrity": "sha512-fpZuDogrAgnyt9oDDz+5DBz0zgPdPZz6D4IR7iESxRXElrlGTRkHJ9eEt+SACRJwT0FNFrt71DFQIUFBJfX/uQ==",
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/NaturalIntelligence"
-        }
-      ],
-      "license": "MIT"
-    },
-    "node_modules/fast-xml-parser": {
-      "version": "5.4.1",
-      "resolved": "https://registry.npmjs.org/fast-xml-parser/-/fast-xml-parser-5.4.1.tgz",
-      "integrity": "sha512-BQ30U1mKkvXQXXkAGcuyUA/GA26oEB7NzOtsxCDtyu62sjGw5QraKFhx2Em3WQNjPw9PG6MQ9yuIIgkSDfGu5A==",
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/fast-xml-builder/-/fast-xml-builder-1.1.4.tgz",
+      "integrity": "sha512-f2jhpN4Eccy0/Uz9csxh3Nu6q4ErKxf0XIsasomfOihuSUa3/xw6w8dnOtCDgEItQFJG8KyXPzQXzcODDrrbOg==",
      "funding": [
        {
          "type": "github",
@@ -3425,8 +3326,24 @@
      ],
      "license": "MIT",
      "dependencies": {
-        "fast-xml-builder": "^1.0.0",
-        "strnum": "^2.1.2"
+        "path-expression-matcher": "^1.1.3"
+      }
+    },
+    "node_modules/fast-xml-parser": {
+      "version": "5.5.11",
+      "resolved": "https://registry.npmjs.org/fast-xml-parser/-/fast-xml-parser-5.5.11.tgz",
+      "integrity": "sha512-QL0eb0YbSTVWF6tTf1+LEMSgtCEjBYPpnAjoLC8SscESlAjXEIRJ7cHtLG0pLeDFaZLa4VKZLArtA/60ZS7vyA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "fast-xml-builder": "^1.1.4",
+        "path-expression-matcher": "^1.4.0",
+        "strnum": "^2.2.3"
      },
      "bin": {
        "fxparser": "src/cli/cli.js"
@@ -3511,9 +3428,9 @@
      }
    },
    "node_modules/flatted": {
-      "version": "3.3.3",
-      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.3.3.tgz",
-      "integrity": "sha512-GX+ysw4PBCz0PzosHDepZGANEuFCMLrnRTiEy9McGjmkCQYwRq4A/X786G/fjM/+OjsWSU1ZrY5qyARZmO/uwg==",
+      "version": "3.4.2",
+      "resolved": "https://registry.npmjs.org/flatted/-/flatted-3.4.2.tgz",
+      "integrity": "sha512-PjDse7RzhcPkIJwy5t7KPWQSZ9cAbzQXcafsetQoD7sOJRQlGikNbx7yZp2OotDnJyrDcbyRq3Ttb18iYOqkxA==",
      "dev": true,
      "license": "ISC"
    },
@@ -3730,9 +3647,9 @@
      "license": "MIT"
    },
    "node_modules/handlebars": {
-      "version": "4.7.8",
-      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.7.8.tgz",
-      "integrity": "sha512-vafaFqs8MZkRrSX7sFVUdo3ap/eNiLnb4IakshzvP56X5Nr1iGKAIqdX6tMlm6HcNRIkr6AxO5jFEoJzzpT8aQ==",
+      "version": "4.7.9",
+      "resolved": "https://registry.npmjs.org/handlebars/-/handlebars-4.7.9.tgz",
+      "integrity": "sha512-4E71E0rpOaQuJR2A3xDZ+GM1HyWYv1clR58tC8emQNeQe3RH7MAzSbat+V0wG78LQBo6m6bzSG/L4pBuCsgnUQ==",
      "dev": true,
      "license": "MIT",
      "dependencies": {
@@ -4897,9 +4814,9 @@
      }
    },
    "node_modules/lodash": {
-      "version": "4.17.23",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.23.tgz",
-      "integrity": "sha512-LgVTMpQtIopCi79SJeDiP0TfWi5CNEc/L/aRdTh3yIvmZXTnheWpKjSZhnvMl8iXbC1tFg9gdHHDMLoV7CnG+w==",
+      "version": "4.18.1",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.18.1.tgz",
+      "integrity": "sha512-dMInicTPVE8d1e5otfwmmjlxkZoUpiVLwyeTdUsi/Caj/gfzzblBcCE5sRHV/AsjuCmxWrte2TNGSYuCeCq+0Q==",
      "dev": true,
      "license": "MIT"
    },
@@ -5302,6 +5219,21 @@
        "node": ">=8"
      }
    },
+    "node_modules/path-expression-matcher": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/path-expression-matcher/-/path-expression-matcher-1.4.0.tgz",
+      "integrity": "sha512-s4DQMxIdhj3jLFWd9LxHOplj4p9yQ4ffMGowFf3cpEgrrJjEhN0V5nxw4Ye1EViAGDoL4/1AeO6qHpqYPOzE4Q==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
    "node_modules/path-is-absolute": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
@@ -5347,9 +5279,9 @@
      "license": "ISC"
    },
    "node_modules/picomatch": {
-      "version": "2.3.1",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.1.tgz",
-      "integrity": "sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==",
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.3.2.tgz",
+      "integrity": "sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA==",
      "dev": true,
      "license": "MIT",
      "engines": {
@@ -6043,9 +5975,9 @@
      }
    },
    "node_modules/strnum": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.1.2.tgz",
-      "integrity": "sha512-l63NF9y/cLROq/yqKXSLtcMeeyOfnSQlfMSlzFt/K73oIaD8DGaQWd7Z34X9GPiKqP5rbSh84Hl4bOlLcjiSrQ==",
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.2.3.tgz",
+      "integrity": "sha512-oKx6RUCuHfT3oyVjtnrmn19H1SiCqgJSg+54XqURKp5aCMbrXrhLjRN9TjuwMjiYstZ0MzDrHqkGZ5dFTKd+zg==",
      "funding": [
        {
          "type": "github",
@@ -6138,9 +6070,9 @@
      }
    },
    "node_modules/tinyglobby/node_modules/picomatch": {
-      "version": "4.0.3",
-      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
-      "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.4.tgz",
+      "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
      "dev": true,
      "license": "MIT",
      "engines": {
@@ -6329,9 +6261,9 @@
      }
    },
    "node_modules/undici": {
-      "version": "6.23.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-6.23.0.tgz",
-      "integrity": "sha512-VfQPToRA5FZs/qJxLIinmU59u0r7LXqoJkCzinq3ckNJp3vKEh7jTWN589YQ5+aoAC/TGRLyJLCPKcLQbM8r9g==",
+      "version": "6.24.1",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.24.1.tgz",
+      "integrity": "sha512-sC+b0tB1whOCzbtlx20fx3WgCXwkW627p4EA9uM+/tNNPkSS+eSEld6pAs9nDv7WbY1UUljBMYPtu9BCOrCWKA==",
      "license": "MIT",
      "engines": {
        "node": ">=18.17"
--- a/package.json
+++ b/package.json
@@ -28,13 +28,13 @@
  "author": "GitHub",
  "license": "MIT",
  "dependencies": {
-    "@actions/cache": "^5.0.1",
-    "@actions/core": "^1.11.1",
-    "@actions/exec": "^1.1.1",
-    "@actions/glob": "^0.5.0",
-    "@actions/http-client": "^4.0.0",
-    "@actions/io": "^1.0.2",
-    "@actions/tool-cache": "^2.0.2",
+    "@actions/cache": "^5.0.5",
+    "@actions/core": "^2.0.3",
+    "@actions/exec": "^2.0.0",
+    "@actions/glob": "^0.5.1",
+    "@actions/http-client": "^3.0.2",
+    "@actions/io": "^2.0.0",
+    "@actions/tool-cache": "^3.0.1",
    "semver": "^7.7.3"
  },
  "devDependencies": {
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -4,6 +4,8 @@ import * as path from 'path';
 import * as semver from 'semver';
 import * as httpm from '@actions/http-client';
 import * as sys from './system';
+import crypto from 'crypto';
+import cp from 'child_process';
 import fs from 'fs';
 import os from 'os';
 import {StableReleaseAlias, isSelfHosted} from './utils';
@@ -15,11 +17,17 @@ const MANIFEST_REPO_OWNER = 'actions';
 const MANIFEST_REPO_NAME = 'go-versions';
 const MANIFEST_REPO_BRANCH = 'main';
 const MANIFEST_URL = `https://raw.githubusercontent.com/${MANIFEST_REPO_OWNER}/${MANIFEST_REPO_NAME}/${MANIFEST_REPO_BRANCH}/versions-manifest.json`;
+const DEFAULT_GO_DOWNLOAD_BASE_URL = 'https://go.dev/dl';

 type InstallationType = 'dist' | 'manifest';

 const GOLANG_DOWNLOAD_URL = 'https://go.dev/dl/?mode=json&include=all';

+// Base URLs known to not serve a version listing JSON endpoint.
+// For these URLs we skip the getInfoFromDist() call entirely and construct
+// the download URL directly, avoiding a guaranteed-404 HTTP request.
+const NO_VERSION_LISTING_BASE_URLS = ['https://aka.ms/golang/release/latest'];
+
 export interface IGoVersionFile {
  filename: string;
  // darwin, linux, windows
@@ -44,15 +52,23 @@ export async function getGo(
  versionSpec: string,
  checkLatest: boolean,
  auth: string | undefined,
-  arch: Architecture = os.arch() as Architecture
+  arch: Architecture = os.arch() as Architecture,
+  goDownloadBaseUrl?: string
 ) {
  let manifest: tc.IToolRelease[] | undefined;
  const osPlat: string = os.platform();
+  const customBaseUrl = goDownloadBaseUrl?.replace(/\/+$/, '');

  if (
    versionSpec === StableReleaseAlias.Stable ||
    versionSpec === StableReleaseAlias.OldStable
  ) {
+    if (customBaseUrl) {
+      throw new Error(
+        `Version aliases '${versionSpec}' are not supported with a custom download base URL. Please specify an exact Go version.`
+      );
+    }
+
    manifest = await getManifest(auth);
    let stableVersion = await resolveStableVersionInput(
      versionSpec,
@@ -76,24 +92,38 @@ export async function getGo(
  }

  if (checkLatest) {
-    core.info('Attempting to resolve the latest version from the manifest...');
-    const resolvedVersion = await resolveVersionFromManifest(
-      versionSpec,
-      true,
-      auth,
-      arch,
-      manifest
-    );
-    if (resolvedVersion) {
-      versionSpec = resolvedVersion;
-      core.info(`Resolved as '${versionSpec}'`);
+    if (customBaseUrl) {
+      core.info(
+        'check-latest is not supported with a custom download base URL. Using the provided version spec directly.'
+      );
    } else {
-      core.info(`Failed to resolve version ${versionSpec} from manifest`);
+      core.info(
+        'Attempting to resolve the latest version from the manifest...'
+      );
+      const resolvedVersion = await resolveVersionFromManifest(
+        versionSpec,
+        true,
+        auth,
+        arch,
+        manifest
+      );
+      if (resolvedVersion) {
+        versionSpec = resolvedVersion;
+        core.info(`Resolved as '${versionSpec}'`);
+      } else {
+        core.info(`Failed to resolve version ${versionSpec} from manifest`);
+      }
    }
  }

+  // Use a distinct tool cache name for custom downloads to avoid
+  // colliding with the runner's pre-installed Go
+  const toolCacheName = customBaseUrl
+    ? customToolCacheName(customBaseUrl)
+    : 'go';
+
  // check cache
-  const toolPath = tc.find('go', versionSpec, arch);
+  const toolPath = tc.find(toolCacheName, versionSpec, arch);
  // If not found in cache, download
  if (toolPath) {
    core.info(`Found in cache @ ${toolPath}`);
@@ -103,49 +133,93 @@ export async function getGo(
  let downloadPath = '';
  let info: IGoVersionInfo | null = null;

-  //
-  // Try download from internal distribution (popular versions only)
-  //
-  try {
-    info = await getInfoFromManifest(versionSpec, true, auth, arch, manifest);
-    if (info) {
-      downloadPath = await installGoVersion(info, auth, arch);
-    } else {
-      core.info(
-        'Not found in manifest.  Falling back to download directly from Go'
-      );
-    }
-  } catch (err) {
-    if (
-      err instanceof tc.HTTPError &&
-      (err.httpStatusCode === 403 || err.httpStatusCode === 429)
-    ) {
-      core.info(
-        `Received HTTP status code ${err.httpStatusCode}.  This usually indicates the rate limit has been exceeded`
-      );
-    } else {
-      core.info((err as Error).message);
-    }
-    core.debug((err as Error).stack ?? '');
-    core.info('Falling back to download directly from Go');
-  }
+  if (customBaseUrl) {
+    //
+    // Download from custom base URL
+    //
+    const skipVersionListing = NO_VERSION_LISTING_BASE_URLS.some(
+      url => customBaseUrl.toLowerCase() === url.toLowerCase()
+    );

-  //
-  // Download from storage.googleapis.com
-  //
-  if (!downloadPath) {
-    info = await getInfoFromDist(versionSpec, arch);
-    if (!info) {
-      throw new Error(
-        `Unable to find Go version '${versionSpec}' for platform ${osPlat} and architecture ${arch}.`
+    if (skipVersionListing) {
+      core.info(
+        'Skipping version listing for known direct-download URL. Constructing download URL directly.'
      );
+      info = getInfoFromDirectDownload(versionSpec, arch, customBaseUrl);
+    } else {
+      try {
+        info = await getInfoFromDist(versionSpec, arch, customBaseUrl);
+      } catch {
+        core.info(
+          'Version listing not available from custom URL. Constructing download URL directly.'
+        );
+      }
+      if (!info) {
+        info = getInfoFromDirectDownload(versionSpec, arch, customBaseUrl);
+      }
    }

    try {
-      core.info('Install from dist');
-      downloadPath = await installGoVersion(info, undefined, arch);
+      core.info('Install from custom download URL');
+      downloadPath = await installGoVersion(info, auth, arch, toolCacheName);
    } catch (err) {
-      throw new Error(`Failed to download version ${versionSpec}: ${err}`);
+      const downloadUrl = info?.downloadUrl || customBaseUrl;
+      if (err instanceof tc.HTTPError && err.httpStatusCode === 404) {
+        throw new Error(
+          `The requested Go version ${versionSpec} is not available for platform ${osPlat}/${arch}. ` +
+            `Download URL returned HTTP 404: ${downloadUrl}`
+        );
+      }
+      throw new Error(
+        `Failed to download Go ${versionSpec} for platform ${osPlat}/${arch} ` +
+          `from ${downloadUrl}: ${err}`
+      );
+    }
+  } else {
+    //
+    // Try download from internal distribution (popular versions only)
+    //
+    try {
+      info = await getInfoFromManifest(versionSpec, true, auth, arch, manifest);
+      if (info) {
+        downloadPath = await installGoVersion(info, auth, arch);
+      } else {
+        core.info(
+          'Not found in manifest.  Falling back to download directly from Go'
+        );
+      }
+    } catch (err) {
+      if (
+        err instanceof tc.HTTPError &&
+        (err.httpStatusCode === 403 || err.httpStatusCode === 429)
+      ) {
+        core.info(
+          `Received HTTP status code ${err.httpStatusCode}.  This usually indicates the rate limit has been exceeded`
+        );
+      } else {
+        core.info((err as Error).message);
+      }
+      core.debug((err as Error).stack ?? '');
+      core.info('Falling back to download directly from Go');
+    }
+
+    //
+    // Download from storage.googleapis.com
+    //
+    if (!downloadPath) {
+      info = await getInfoFromDist(versionSpec, arch);
+      if (!info) {
+        throw new Error(
+          `Unable to find Go version '${versionSpec}' for platform ${osPlat} and architecture ${arch}.`
+        );
+      }
+
+      try {
+        core.info('Install from dist');
+        downloadPath = await installGoVersion(info, undefined, arch);
+      } catch (err) {
+        throw new Error(`Failed to download version ${versionSpec}: ${err}`);
+      }
    }
  }

@@ -229,20 +303,26 @@ async function cacheWindowsDir(
 async function addExecutablesToToolCache(
  extPath: string,
  info: IGoVersionInfo,
-  arch: string
+  arch: string,
+  toolName: string = 'go'
 ): Promise<string> {
-  const tool = 'go';
  const version = makeSemver(info.resolvedVersion);
  return (
-    (await cacheWindowsDir(extPath, tool, version, arch)) ||
-    (await tc.cacheDir(extPath, tool, version, arch))
+    (await cacheWindowsDir(extPath, toolName, version, arch)) ||
+    (await tc.cacheDir(extPath, toolName, version, arch))
  );
 }

+export function customToolCacheName(baseUrl: string): string {
+  const hash = crypto.createHash('sha256').update(baseUrl).digest('hex');
+  return `go-${hash.substring(0, 8)}`;
+}
+
 async function installGoVersion(
  info: IGoVersionInfo,
  auth: string | undefined,
-  arch: string
+  arch: string,
+  toolName: string = 'go'
 ): Promise<string> {
  core.info(`Acquiring ${info.resolvedVersion} from ${info.downloadUrl}`);

@@ -260,13 +340,48 @@ async function installGoVersion(
    extPath = path.join(extPath, 'go');
  }

+  // For custom downloads, detect the actual installed version so the cache
+  // key reflects the real patch level (e.g. input "1.20" may install 1.20.14).
+  if (toolName !== 'go') {
+    const actualVersion = detectInstalledGoVersion(extPath);
+    if (actualVersion && actualVersion !== info.resolvedVersion) {
+      core.info(
+        `Requested version '${info.resolvedVersion}' resolved to installed version '${actualVersion}'`
+      );
+      info.resolvedVersion = actualVersion;
+    }
+  }
+
  core.info('Adding to the cache ...');
-  const toolCacheDir = await addExecutablesToToolCache(extPath, info, arch);
+  const toolCacheDir = await addExecutablesToToolCache(
+    extPath,
+    info,
+    arch,
+    toolName
+  );
  core.info(`Successfully cached go to ${toolCacheDir}`);

  return toolCacheDir;
 }

+function detectInstalledGoVersion(goDir: string): string | null {
+  try {
+    const goBin = path.join(
+      goDir,
+      'bin',
+      os.platform() === 'win32' ? 'go.exe' : 'go'
+    );
+    const output = cp.execFileSync(goBin, ['version'], {encoding: 'utf8'});
+    const match = output.match(/go version go(\S+)/);
+    return match ? match[1] : null;
+  } catch (err) {
+    core.debug(
+      `Failed to detect installed Go version: ${(err as Error).message}`
+    );
+    return null;
+  }
+}
+
 export async function extractGoArchive(archivePath: string): Promise<string> {
  const platform = os.platform();
  let extPath: string;
@@ -384,14 +499,23 @@ export async function getInfoFromManifest(

 async function getInfoFromDist(
  versionSpec: string,
-  arch: Architecture
+  arch: Architecture,
+  goDownloadBaseUrl?: string
 ): Promise<IGoVersionInfo | null> {
-  const version: IGoVersion | undefined = await findMatch(versionSpec, arch);
+  const dlUrl = goDownloadBaseUrl
+    ? `${goDownloadBaseUrl}/?mode=json&include=all`
+    : GOLANG_DOWNLOAD_URL;
+  const version: IGoVersion | undefined = await findMatch(
+    versionSpec,
+    arch,
+    dlUrl
+  );
  if (!version) {
    return null;
  }

-  const downloadUrl = `https://go.dev/dl/${version.files[0].filename}`;
+  const baseUrl = goDownloadBaseUrl || DEFAULT_GO_DOWNLOAD_BASE_URL;
+  const downloadUrl = `${baseUrl}/${version.files[0].filename}`;

  return <IGoVersionInfo>{
    type: 'dist',
@@ -401,9 +525,43 @@ async function getInfoFromDist(
  };
 }

+export function getInfoFromDirectDownload(
+  versionSpec: string,
+  arch: Architecture,
+  goDownloadBaseUrl: string
+): IGoVersionInfo {
+  // Reject version specs that can't map to an artifact filename
+  if (/[~^>=<|*x]/.test(versionSpec)) {
+    throw new Error(
+      `Version range '${versionSpec}' is not supported with a custom download base URL ` +
+        `when version listing is unavailable. Please specify an exact version (e.g., '1.25.0').`
+    );
+  }
+
+  const archStr = sys.getArch(arch);
+  const platStr = sys.getPlatform();
+  const extension = platStr === 'windows' ? 'zip' : 'tar.gz';
+  // Ensure version has the 'go' prefix for the filename
+  const goVersion = versionSpec.startsWith('go')
+    ? versionSpec
+    : `go${versionSpec}`;
+  const fileName = `${goVersion}.${platStr}-${archStr}.${extension}`;
+  const downloadUrl = `${goDownloadBaseUrl}/${fileName}`;
+
+  core.info(`Constructed direct download URL: ${downloadUrl}`);
+
+  return <IGoVersionInfo>{
+    type: 'dist',
+    downloadUrl: downloadUrl,
+    resolvedVersion: versionSpec.replace(/^go/, ''),
+    fileName: fileName
+  };
+}
+
 export async function findMatch(
  versionSpec: string,
-  arch: Architecture = os.arch() as Architecture
+  arch: Architecture = os.arch() as Architecture,
+  dlUrl: string = GOLANG_DOWNLOAD_URL
 ): Promise<IGoVersion | undefined> {
  const archFilter = sys.getArch(arch);
  const platFilter = sys.getPlatform();
@@ -412,7 +570,7 @@ export async function findMatch(
  let match: IGoVersion | undefined;

  const candidates: IGoVersion[] | null = await module.exports.getVersionsDist(
-    GOLANG_DOWNLOAD_URL
+    dlUrl
  );
  if (!candidates) {
    throw new Error(`golang download url did not return results`);
--- a/src/main.ts
+++ b/src/main.ts
@@ -34,11 +34,21 @@ export async function run() {

      const checkLatest = core.getBooleanInput('check-latest');

+      const goDownloadBaseUrl =
+        core.getInput('go-download-base-url') ||
+        process.env['GO_DOWNLOAD_BASE_URL'] ||
+        undefined;
+
+      if (goDownloadBaseUrl) {
+        core.info(`Using custom Go download base URL: ${goDownloadBaseUrl}`);
+      }
+
      const installDir = await installer.getGo(
        versionSpec,
        checkLatest,
        auth,
-        arch
+        arch,
+        goDownloadBaseUrl
      );

      const installDirVersion = path.basename(path.dirname(installDir));