状态码太多，记住几个常见得就好，还有就是记住不同数字开头，大致是哪方面出错，然后其他的就查好了

• http_status_bad_request (400)
  the request could not be processed by the server due to invalid syntax.
  因为语法不能被服务器处理

• http_status_denied (401)
  the requested resource requires user authentication.
  请求资源命令必须被验证（拒绝访问）

• http_status_payment_req (402)
  not currently implemented in the http protocol.
  没有完全实现http协议

• http_status_forbidden (403)
  the server understood the request, but is refusing to fulfill it.
  服务器理解了请求，但是拒绝完成他

• http_status_not_found (404)
  the server has not found anything matching the requested uri (uniform resource identifier).
  没有找到任何被指定的uri

• http_status_bad_method (405)
  the http verb used is not allowed.
  http动作不被允许

• http_status_none_acceptable (406)
  no resp acceptable to the client were found.
  应答没有被客户接受

• http_status_proxy_auth_req (407)
  proxy authentication required.
  代理必须被验证

• http_status_request_timeout (408)
  the server timed out waiting for the request.
  服务器在等待请求时中止了

• http_status_conflict (409)
  the request could not be completed due to a c with the current state of the resource. the user should resubmit with more information.
  请求不能被完成，问题是资源冲突。用户应该进行调整

• http_status_gone (410)
  the requested resource is no l available at the server, and no forwarding address is known.
  请求的资源在服务器上不再可用，而且没有转发地址

• http_status_length_required (411)
  the server refuses to accept the request without a defined c length.
  服务器拒绝接受没有定义目录大小的请求

• http_status_precond_failed (412)
  the prec given in or more of the request header fields evaluated to false when it was tested on the server.
  当在服务器上测试请求头文件放弃一个或者多个请求的条件

• http_status_request_too_large (413)
  the server is refusing to process a request because the request entity is larger than the server is willing or able to process.
  服务器拒绝处理请求，原因是请求的大小超过服务器能够处理的大小

• http_status_uri_too_long (414)
  the server is refusing to service the request because the request uri (uniform resource identifier) is l than the server is willing to interpret.
  服务器拒绝服务，原因是请求的uri超过了服务器能够揭示的长度

• http_status_unsupported_media (415)
  the server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method.
  服务器拒绝服务，原因是请求格式不被支持