added offline mode

pkg/srv/srv.go

@@ -49,7 +49,7 @@ func (fs *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		r.URL.Path = upath
 	}
 	p := path.Clean(upath)
-	d, err := fs.fs.Stat(p)
+	d, offline, err := fs.fs.StatWithOffline(p)
 	if err != nil {
 		msg, code := toHTTPError(err)
 		http.Error(w, msg, code)
@@ -82,7 +82,16 @@ func (fs *FileServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 
 	i := &responseInterceptor{w: w}
+	// TODO implement directory listing cache
+	offline = true
+	if offline {
+		r.Header.Del("If-Modified-Since")
+		r.Header.Del("Cache-Control")
+	}
 	fs.h.ServeHTTP(i, r)
+	if offline {
+		w.Header().Del("Last-Modified")
+	}
 	paths, err := i.GetPaths()
 	if err == io.EOF {
 		w.WriteHeader(i.Status())