golang websocket over https proxy

gistfile1.go

func HttpConnect(proxy, url_ string) (io.ReadWriteCloser, error) {
	p, err := net.Dial("tcp", proxy)
	if err != nil {
		return nil, err
	}

	turl, err := url.Parse(url_)
	if err != nil {
		return nil, err
	}

	req := http.Request{
		Method: "CONNECT",
		URL:    &url.URL{},
		Host:   turl.Host,
	}

	cc := httputil.NewProxyClientConn(p, nil)
	cc.Do(&req)
	if err != nil && err != httputil.ErrPersistEOF {
		return nil, err
	}

	rwc, _ := cc.Hijack()

	return rwc, nil
}

func ProxyDial(url_, protocol, origin string) (ws *websocket.Conn, err error) {
	if os.Getenv("HTTP_PROXY") == "" {
		return websocket.Dial(url_, protocol, origin)
	}

	purl, err := url.Parse(os.Getenv("HTTP_PROXY"))
	if err != nil {
		return nil, err
	}

	config, err := websocket.NewConfig(url_, origin)
	if err != nil {
		return nil, err
	}

	if protocol != "" {
		config.Protocol = []string{protocol}
	}

	client, err := HttpConnect(purl.Host, url_)
	if err != nil {
		return nil, err
	}

	return websocket.NewClient(config, client)
}