func (mux *ServeMux) match(path string) Handler { var h Handler var n = 0 for k, v := range mux.m { if !pathMatch(k, path) { continue } if h == nil || len(k) > n { n = len(k) h = v.h } } return h }
func pathMatch(pattern, path string) bool { if len(pattern) == 0 { // should not happen return false } n := len(pattern) if pattern[n-1] != '/' { return pattern == path } return len(path) >= n && path[0:n] == pattern }
func (mux *ServeMux) handler(r *Request) Handler { mux.mu.RLock() defer mux.mu.RUnlock() // Host-specific pattern takes precedence over generic ones h := mux.match(r.Host + r.URL.Path) if h == nil { h = mux.match(r.URL.Path) } if h == nil { h = NotFoundHandler() } return h }总是会请求一个 "/favicon.ico" 所以总是会出现 "/" 被请求了两次
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