curl 返回头部和正文

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

"