生产环境常见的HTTP状态码列表-转自（老男孩）
200 - OK，服务器成功返回网页
- Standard response for successful HTTP requests.301 - Moved Permanently（永久跳转），请求的网页已永久跳转到新位置。
- This and all future requests should be directed to the given.403 - Forbidden（禁止访问）,服务器拒绝请求
- forbidden request (matches a deny filter) => HTTP 403 - The request was a legal request, but the server is refusing to respond to it.404 - Not Found,服务器找不到请求的页面。
- The requested resource could not be found but may be available again in the future.500 - Internal Server Error（内部服务器错误）
- internal error in haproxy => HTTP 500 - A generic error message, given when no more specific message is suitable.502 - Bad Gateway（坏的网关）,一般是网关服务器请求后端服务时，后端服务没有按照http协议正确返回结果。
- the server returned an invalid or incomplete response => HTTP 502 - The server was acting as a gateway or proxy and received an invalid response from the upstream server.503 - Service Unavailable（服务当前不可用）,可能因为超载或停机维护。
- no server was available to handle the request => HTTP 503 - The server is currently unavailable (because it is overloaded or down for maintenance).504 - Gateway Timeout（网关超时）,一般是网关服务器请求后端服务时，后端服务没有在特定的时间内完成服务。
- the server failed to reply in time => HTTP 504 - The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.