diff --git a/internal/frontend/urlinfo.go b/internal/frontend/urlinfo.go
index f523e22..9737184 100644
--- a/internal/frontend/urlinfo.go
+++ b/internal/frontend/urlinfo.go
@@ -182,7 +182,7 @@
 // isSupportedVersion reports whether the version is supported by the frontend.
 func isSupportedVersion(fullPath, requestedVersion string) bool {
 	if _, ok := internal.DefaultBranches[requestedVersion]; ok {
-		return !stdlib.Contains(fullPath)
+		return !stdlib.Contains(fullPath) || requestedVersion == "master"
 	}
 	return requestedVersion == internal.LatestVersion || semver.IsValid(requestedVersion)
 }
diff --git a/internal/frontend/urlinfo_test.go b/internal/frontend/urlinfo_test.go
index a93a5e9..d876db8 100644
--- a/internal/frontend/urlinfo_test.go
+++ b/internal/frontend/urlinfo_test.go
@@ -218,7 +218,7 @@
 		{"net/http", "v1.2.3", true}, // isSupportedVersion expects the goTag is already converted to semver
 		{"net/http", "v1.2.3.bad", false},
 		{"net/http", "latest", true},
-		{"net/http", "master", false},
+		{"net/http", "master", true},
 		{"net/http", "main", false},
 	}
 	for _, test := range tests {
diff --git a/internal/frontend/versions.go b/internal/frontend/versions.go
index 29da4d5..8fe7e7f 100644
--- a/internal/frontend/versions.go
+++ b/internal/frontend/versions.go
@@ -276,6 +276,9 @@
 // displayVersion returns the version string, formatted for display.
 func displayVersion(v string, modulePath string) string {
 	if modulePath == stdlib.ModulePath {
+		if strings.HasPrefix(v, "v0.0.0") {
+			return strings.Split(v, "-")[2]
+		}
 		return goTagForVersion(v)
 	}
 	return formatVersion(v)