需求:
golang实现proxy来做到前端请求某个url后落到proxy上,proxy再发起请求到backend server, 然后为了性能问题, 我需要考虑超时后放弃后端返回,以及提醒http client超时(504)

我的思路:

target, err := url.Parse(backend)  
if err != nil {  
   fmt.Printf("backend %s parse errr : %v\n", backend, err)  
}  
  
reserveProxy := httputil.NewSingleHostReverseProxy(target)  
reserveProxy.Transport = Transport{cfg}  
c.Request.Host = target.Host  
c.Request.URL.Path = newReqpath  
  
reserveProxy.ServeHTTP(c.Writer, c.Request)

proxyTransport := http.Transport{  
   Proxy:                  http.ProxyFromEnvironment,  
   DialContext: (&net.Dialer{  
      Timeout:   3 * time.Second,  
      KeepAlive: 30 * time.Second,  
      Deadline: time.Now().Add(3 * time.Second),  
   }).DialContext,  
  
   ForceAttemptHTTP2:     true,  
   MaxIdleConns:          100,  
   IdleConnTimeout:       90 * time.Second,  
   TLSHandshakeTimeout:   10 * time.Second,  
   ExpectContinueTimeout: 1 * time.Second,  
}  
return proxyTransport.RoundTrip(r)

我试图使用golang自带的reserveproxy来做proxy,并且利用transport的timeout,但是整个请求完全没有超时的作用(模拟一个接口20s,整个proxy就20s返回给http client)

寻找思路:
github issue
stackoverflow

发现有人和我遇到同样的问题,但是没有解决

所以这是不是golang的一个bug,还是我的使用不当?