Golang：如何用表单请求模拟POST？

Question

I've been scouring the internet and can't find much at all about posting forms in golang tests. This is my attempt at it. I get the error "dial tcp: too many colons in address ::1" though. If I change the address to "http://localhost:8080/" I get "dial tcp 127.0.0.1:8080: connection refused".

I've read that if you put the (IPv6) address in brackets, the brackets will fix the problem, but then I get the error unrecognized protocol.

var addr = "http://::1/"
h := handlers.GetHandler()
server := httptest.NewServer(h)
server.URL = addr
req, err := http.PostForm(addr+"login",
        url.Values{"username": {"lemonparty"}, "password": {"bluewaffle"}})
if err != nil {
    log.Fatal(err)
}

Answer 1

tl;dr the Listener in httptest.Server doesn't use the httptest.Server.URL as the url to listen on. It doesn't care what that value is. It listens on local hosts lowest open port number.

The URL property on httptest.Server is not really doing anything. Change it all you want, just don't send your requests there. Check out this example program https://play.golang.org/p/BsH38WLkrJ

Basically, if I change the servers URL then send the request to the value I set it to it doesn't work, but if I send it to the default value it does.

Also check out the source http://golang.org/src/net/http/httptest/server.go?s=415:1018#L65, as well as the certs at the bottom of the file; clearly hard coded for the lowest open port on local host. If you want to make request to another URL the Listener.