使用golang终止IP层的http请求

Question

I am making an http post request to a server using golang. Suppose the server is currently turned off (Means the machine on which the server runs is turned off) then the request is stuck at the IP layer. So my program execution is unable to proceed further. It is unable to proceed to the Application layer. So is there any way in golang to stop this. I am using the following code.

req, err := http.NewRequest("POST", url, bytes.NewReader(b))
       if err != nil {
               return errors.Wrap(err, "new request error")
       }
resp, err := http.DefaultClient.Do(req)
       if err != nil {
               return errors.Wrap(err, "http request error")
       }
       defer resp.Body.Close()

Is there anything that can be added to this, to terminate the request if it doesn't find anything from the IP layer.

Answer 1

The default http Client has no timeout. You can create an explicit http.Client yourself and set the timeout:

var cl = &http.Client{
    Timeout: time.Second * 10,
}

resp, err := cl.Do(req)

if err != nil {
    // err will be set on timeout
    return errors.Wrap(err, "http request error")
}
defer resp.Body.Close()

If the server does not answer any more in the middle of a request, you can handle the timeout.