Interface Test finishing 1: HTTP status code

Status code has three numbers, the first number in response to the defined categories, and there are five possible values:
1xx: indication information - indicates a request has been received, processing continues
2xx: Success - indicates that the request has been successfully received, understand, accept
3xx: redirection - to fulfill the request must go a step further
4xx: client error - the request has a syntax error or a request can not be achieved
5xx: server-side error - the server failed to achieve a legitimate request
common status codes , state description, description:
200 the OK // client request was successful
400 Bad request // client requests a syntax error, can not be understood by the server
401 unauthorized // request is not authorized, the status code must WWW-Authenticate header field used with
403 Forbidden // server receives the request, but refused to provide service
404 not Found // requested resource does not exist, eg: enter the wrong the URL of
500 Internal server error // server goes unexpected errors
503 server unavailable // server currently can not handle the client's request, may return to normal after a period of time