tsweb: replace NewMux with a more flexible DebugHandler.

Signed-off-by: David Anderson <danderson@tailscale.com>

tsweb/tsweb.go

@@ -37,30 +37,6 @@ func init() {
 // DevMode controls whether extra output in shown, for when the binary is being run in dev mode.
 var DevMode bool
 
-// NewMux returns a new ServeMux with debugHandler registered (and protected) at /debug/.
-func NewMux(debugHandler http.Handler) *http.ServeMux {
-	mux := http.NewServeMux()
-	registerCommonDebug(mux)
-	mux.Handle("/debug/", Protected(debugHandler))
-	return mux
-}
-
-func registerCommonDebug(mux *http.ServeMux) {
-	mux.Handle("/debug/pprof/", Protected(http.DefaultServeMux)) // to net/http/pprof
-	mux.Handle("/debug/vars", Protected(http.DefaultServeMux))   // to expvar
-	mux.Handle("/debug/varz", Protected(http.HandlerFunc(VarzHandler)))
-	mux.Handle("/debug/gc", Protected(http.HandlerFunc(gcHandler)))
-}
-
-func gcHandler(w http.ResponseWriter, r *http.Request) {
-	w.Write([]byte("running GC...\n"))
-	if f, ok := w.(http.Flusher); ok {
-		f.Flush()
-	}
-	runtime.GC()
-	w.Write([]byte("Done.\n"))
-}
-
 func DefaultCertDir(leafDir string) string {
 	cacheDir, err := os.UserCacheDir()
 	if err == nil {