skip json for known URL

__tests__/setup-go.test.ts

@@ -1141,7 +1141,7 @@ use .
       expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
     });
 
-    it('falls back to direct download when version listing is unavailable', async () => {
+    it('skips version listing for known direct-download URL (aka.ms)', async () => {
       os.platform = 'linux';
       os.arch = 'x64';
 
@@ -1151,11 +1151,6 @@ use .
       inputs['go-version'] = versionSpec;
       inputs['go-download-base-url'] = customBaseUrl;
 
-      // Simulate JSON API not being available (like aka.ms)
-      getSpy.mockImplementationOnce(() => {
-        throw new Error('Not a JSON endpoint');
-      });
-
       findSpy.mockImplementation(() => '');
       dlSpy.mockImplementation(async () => '/some/temp/path');
       const toolPath = path.normalize('/cache/go/1.25.0/x64');
@@ -1166,17 +1161,18 @@ use .
 
       const expPath = path.join(toolPath, 'bin');
       expect(logSpy).toHaveBeenCalledWith(
-        'Version listing not available from custom URL. Constructing download URL directly.'
+        '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', async () => {
+    it('constructs correct direct download URL for windows (aka.ms)', async () => {
       os.platform = 'win32';
       os.arch = 'x64';
 
@@ -1187,11 +1183,6 @@ use .
       inputs['go-download-base-url'] = customBaseUrl;
       process.env['RUNNER_TEMP'] = 'C:\\temp\\';
 
-      // Simulate JSON API not being available
-      getSpy.mockImplementationOnce(() => {
-        throw new Error('Not a JSON endpoint');
-      });
-
       findSpy.mockImplementation(() => '');
       dlSpy.mockImplementation(async () => 'C:\\temp\\some\\path');
       extractZipSpy.mockImplementation(() => 'C:\\temp\\some\\other\\path');
@@ -1200,6 +1191,7 @@ use .
 
       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',
@@ -1409,11 +1401,6 @@ use .
       inputs['go-version'] = versionSpec;
       inputs['go-download-base-url'] = customBaseUrl;
 
-      // Simulate JSON API not being available (like aka.ms)
-      getSpy.mockImplementationOnce(() => {
-        throw new Error('Not a JSON endpoint');
-      });
-
       findSpy.mockImplementation(() => '');
       dlSpy.mockImplementation(async () => '/some/temp/path');
       extractTarSpy.mockImplementation(async () => '/some/other/temp/path');

dist/setup/index.js

@@ -77063,6 +77063,10 @@ 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';
 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'];
 function getGo(versionSpec_1, checkLatest_1, auth_1) {
     return __awaiter(this, arguments, void 0, function* (versionSpec, checkLatest, auth, arch = os_1.default.arch(), goDownloadBaseUrl) {
         var _a;
@@ -77120,15 +77124,22 @@ function getGo(versionSpec_1, checkLatest_1, auth_1) {
             //
             // Download from custom base URL
             //
-            try {
-                info = yield getInfoFromDist(versionSpec, arch, customBaseUrl);
-            }
-            catch (_b) {
-                core.info('Version listing not available from custom URL. Constructing download URL directly.');
-            }
-            if (!info) {
+            const skipVersionListing = NO_VERSION_LISTING_BASE_URLS.some(url => customBaseUrl.toLowerCase() === url.toLowerCase());
+            if (skipVersionListing) {
+                core.info('Skipping version listing for known direct-download URL. Constructing download URL directly.');
                 info = getInfoFromDirectDownload(versionSpec, arch, customBaseUrl);
             }
+            else {
+                try {
+                    info = yield getInfoFromDist(versionSpec, arch, customBaseUrl);
+                }
+                catch (_b) {
+                    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 custom download URL');
                 downloadPath = yield installGoVersion(info, auth, arch, toolCacheName);

src/installer.ts

@@ -23,6 +23,11 @@ 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
@@ -132,15 +137,26 @@ export async function getGo(
     //
     // Download from custom base URL
     //
-    try {
-      info = await getInfoFromDist(versionSpec, arch, customBaseUrl);
-    } catch {
+    const skipVersionListing = NO_VERSION_LISTING_BASE_URLS.some(
+      url => customBaseUrl.toLowerCase() === url.toLowerCase()
+    );
+
+    if (skipVersionListing) {
       core.info(
-        'Version listing not available from custom URL. Constructing download URL directly.'
+        'Skipping version listing for known direct-download URL. Constructing download URL directly.'
       );
-    }
-    if (!info) {
       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 {