How to unwrap url.Error returned from http.Client?

问题

I'm using net.http.client

After sending the request with

resp, err := Client.Do(req)

I'm getting the error I want to work with.

err.Error() returns an error as string. But I need to work with error as an object. I found the method Unwrap() that seems to be returning an url.Error object, but I'm getting err.Unwrap undefined (type error has no field or method Unwrap)

Sorry for dumb question, I'm totally new to golang.

回答1:

According to the documentation, any error returned from Client.Do will be *url.Error, but since the method signature says (*Response, error), you will have to convert it explicitly before use:

urlErr := err.(*url.Error)
if urlErr.Timeout() {
    // ..
}

来源：https://stackoverflow.com/questions/60150236/how-to-unwrap-url-error-returned-from-http-client