请求返回400，怎么提取确切信息？

zncliving

HTTP/1.1 400 Bad Request
Server: nginx/1.6.2
Date: Mon, 14 Sep 2015 11:38:36 GMT
Content-Type: application/json; charset=UTF-8
Connection: keep-alive
X-Powered-By: PHP/5.5.21
Content-Length: 109

{"state":0,"message":"密码错误","error":{"name":"Exception","message":"密码错误","code":110}}

返回的是  远程服务器返回错误: (400) 错误的请求。
请问怎么提取到  {"state":0,"message":"用户不存在","error":{"name":"Exception","message":"用户不存在","code":20101}}  

cload

catch中判断，获取……

站长苏飞

这不是说的密码错误吗