Description: this article is talking about some common HTTP error we might meet
302
临时重定向
304
客户端申请的资源存在，但是条件不满足
400
The server cannot or will not process the request due to something that is perceived to be a client error
401
unanuthorized client error status response code indicates that the request has not been applied because it lack vaild authentication credentials for thr target resource
403
Forbidden client error status response code indicates that the server understood the request but refuses to authorize it .
404
the server can’t find the requested resources
405
method not allowed response status code indicates that the request method is known by the server but it not supported by the target resource
500
the server encountered an unexpected condition that prevented it from fulfilling the request.
