}
	return referer
}

// didTimeout is non-nil only if err != nil.
func (c *Client) send(req *Request, deadline time.Time) (resp *Response, didTimeout func() bool, err error) {
	if c.Jar != nil {
		for _, cookie := range c.Jar.Cookies(req.URL) {
			req.AddCookie(cookie)
		}
	}
	resp, didTimeout, err = send(req, c.transport(), deadline)
	if err != nil {
		return nil, didTimeout, err
	}
	if c.Jar != nil {

function scheduleIdleWork(){if(idleWorkScheduled)return;if(!nativeRequestIdleCallbackSupported()){scheduleRAF();return;}
idleWorkScheduled=true;window.requestIdleCallback(function(deadline,didTimeout){processIdleWork(false,deadline);},{timeout:REQUEST_IDLE_CALLBACK_TIMEOUT_MILLISECONDS});}