gotools/godoc/redirect/redirect.go

// Register registers HTTP handlers that redirect old godoc paths to their new equivalents.
// If mux is nil it uses http.DefaultServeMux.
func Register(mux *http.ServeMux) { … }

func Handler(target string) http.Handler { … }

var validID …

func PrefixHandler(prefix, baseURL string) http.Handler { … }

// Redirect requests from the old "/src/pkg/foo" to the new "/src/foo".
// See http://golang.org/s/go14nopkg
func srcPkgHandler(w http.ResponseWriter, r *http.Request) { … }