$client = new Client([
      'base_uri' => 'http://httpbin.org','timeout'  => 2.0,]);
   $response = $client->request('GET','',['debug' => true]);
   var_dump($response->getBody()->getContents());

我得到的回应是：

* About to connect() to httpbin.org port 80 (#0)
*   Trying 23.22.14.18...
* Connected to httpbin.org (23.22.14.18) port 80 (#0)
> GET / HTTP/1.1
User-Agent: GuzzleHttp/6.2.0 curl/7.29.0 PHP/5.5.34
Host: httpbin.org

HTTP/1.1 200 OK
Server: Nginx
Date: Mon,06 Jun 2016 06:48:13 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 12150
Connection: keep-alive
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true

* Connection #0 to host httpbin.org left intact
string(0) ""

你可以看到正文是“”但内容长度是正确的.