Function Negotiate

transport/spdy/spdy.go:80–94

Negotiate opens a connection to a remote server and attempts to negotiate a SPDY connection. Upon success, it returns the connection and the protocol selected by the server. The client transport must use the upgradeRoundTripper - see RoundTripperFor.

(upgrader Upgrader, client *http.Client, req *http.Request, protocols ...string)

// a SPDY connection. Upon success, it returns the connection and the protocol selected by
// the server. The client transport must use the upgradeRoundTripper - see RoundTripperFor.
func Negotiate(upgrader Upgrader, client *http.Client, req *http.Request, protocols ...string) (httpstream.Connection, string, error) {
	for i := range protocols {
		req.Header.Add(httpstream.HeaderProtocolVersion, protocols[i])
	}
	resp, err := client.Do(req)
	if err != nil {
		return nil, "", fmt.Errorf("error sending request: %v", err)
	}
	defer resp.Body.Close()
	conn, err := upgrader.NewConnection(resp)
	if err != nil {
		return nil, "", err
	}
	return conn, resp.Header.Get(httpstream.HeaderProtocolVersion), nil
}