100-- customers must continue to make requests
101-- client asks the server to convert the HTTP protocol version upon request
200-- trading success
201-- prompted know the new URL file
202-- accept and deal with, but the process is not completed
203-- return uncertain or incomplete information
204-- requests received, but returned information is null
205-- server completes the request, the user agent must reset the current document has been visited
206-- server has completed GET request some users
300-- resource request may be obtained in many
301-- deletion request data
302-- address found in other requested data
303-- advise clients to access the URL or other access methods
304-- client has performed a GET, but the file does not change
305-- resources must be requested from the server specified address
306-- HTTP previous version of code used in the current version is no longer in use
307-- stated delete temporary resource request
400-- Bad Request, such as syntax errors
401-- request authorization failed
402-- effective retention head in response ChargeTo
403-- request is not allowed
404-- not find the file, query or URl
405-- method does not allow the user fields defined in Request-Line
406-- according to Accept sent by the user to drag, the requested resource is not accessible
407-- similar 401, the user must first be authorized on the proxy server
408-- client request is not completed within a user-specified time hungry
409-- on the current status of the resource, the request can not be completed
410-- no longer have this resource on the server and no further reference address
411-- server denies the user-defined attribute request Content-Length
412-- request one or more header fields in the current request error
413-- resource request is larger than the size allowed by the server
414-- resources requested URL is longer than the length allowed by the server
415-- requested resource request is not supported project format
416-- request request including a Range header field is not within the range value indicating the current request resources, the request does not comprise Request If-Range header field
417-- server does not meet a desired value specified by the request Expect header field, if a proxy server may be a server can not satisfy the request
500-- generate an internal server error
501-- server does not support the requested function
502-- server is temporarily unavailable, and sometimes to prevent system overload
503-- server overload or suspend service
504-- overload mark, use another gateway server in response to a user or service, set a longer waiting time value
505-- server does not support or refuses to support the specified HTTP request header version
1xx: class information response indicating receipt of the request and continue processing
2xx: Success response classes process, showing the action was successfully received, understood and accepted
3xx: Redirection response class, in order to complete the specified action, must undergo further processing
4xx: Client error, the client request contains a syntax error or is not executed correctly
5xx: server error, the server can not perform a proper request is correct