头部
string(195) "HTTP/1.1 200 OK Server: openresty/1.7.7.1 Date: Wed, 05 Sep 2018 13:18:33 GMT Content-Type: text/plain; charset=utf-8 Content-Length: 10 Connection: close X-Request-Id: wzlhymuuj36fnjhq "
原文：https://www.cnblogs.com/hehexu/p/9594571.html