Added a newServePath() func that is a special variant of newPath that is used in ServeHTTP (it lacks an unnecessary check for * catch-all symbol).

httpr.go

@@ -36,9 +36,21 @@ func newPath(path string) (path, error) {
 	return parts, nil
 }
 
+// newServePath is a reduced version of newPath for ServeHTTP.
+func newServePath(path string) (path, error) {
+	pathLen := len(path)
+
+	if path[0] != '/' {
+		return nil, errors.New("path should start with a slash symbol \"/\"")
+	}
+
 	path = strings.ReplaceAll(path, "//", "/")
 
-	parts := strings.Split(strings.TrimSuffix(path, "/"), "/")
+	if path[pathLen-1] == '/' {
+		path = path[:pathLen-1]
+	}
+
+	parts := strings.Split(path, "/")
 
 	parts[0] = "/"
 
@@ -179,7 +191,7 @@ func (rr *Router) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	path, err := newPath(r.URL.Path)
+	path, err := newServePath(r.URL.Path)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusNotAcceptable)
 		return