Ajax status description

 

The readystate attribute has five possible values:
 
0: (not initialized) The send method has not been called
1: (loading) The send method has been called and the request is still being processed.
2: (loaded) The send method has been completed, and the entire response has been received
3: The response is being parsed.
4: (completed) the response has been resolved and is ready for further processing.

Description of the Status attribute of the object XMLHttpRequest: 0 **: not started 1 **: request received, continue processing 2 **: Operation received successfully, analysis, and acceptance 3 **: this request must be further processed. 4 **: The request contains an error syntax or cannot be completed. 5 **: the server fails to execute a fully valid request. 100-the customer must continue to send the request (continue) 101 -- the client requests the server to convert the HTTP protocol version (switching protocols) 200 according to the request -- transaction success (OK) 201 -- prompt to know the URL of the new file (created) 202 -- accept and process, but not complete (accepted) 203 -- the returned information is unknown or incomplete (non-authoritative information) 204 -- the request is received, but the returned information is blank (NO content) 205 -- when the server completes the request, the user agent must reset the currently browsed file (reset content) 206 -- the server has completed some users' GET requests (partial content) 300 -- requested resources can be obtained in multiple places (Multiple choices) 301 -- moved permanently 302 -- request data (found) found at other addresses) 303 -- it is recommended that the customer access other URLs or access methods (see other) 304 -- the client has executed get, but the file has not changed (not modified) 305 -- the requested resource must be obtained from the address specified by the server (use proxy) 306 -- the code used in the previous version of HTTP, in the current version, 307 is no longer used -- temporary redirect 400 -- the requested resource is temporarily deleted (temporary redirect) 401 -- the request is incorrect, such as a syntax error (Bad request) -- The request fails to be authorized (unauthorized) 402 -- retain valid chargeto header response (payment required) 403 -- the request is not allowed (the resource is unavailable due to the permission setting of the file or directory on the server) (Forbidden) 404 -- no file, query, or URL found (the specified resource is not found) 405 -- the method defined by the user in the request-line field is not allowed (method not allowed) 406 -- the requested resource is not accessible (not acceptable) 407 Based on the accept drag sent by the user -- similar to 401, the user must first be authorized on the proxy server (proxy authentication required) 408 -- the client has not completed the request (request timeout) 409 within the user's specified hunger time -- the request cannot be completed due to the current resource status (conflict) 410 -- this resource no longer exists on the server and no further reference address (gone) 411 -- the server rejects the User-Defined Content-Length attribute request (length required) 412 -- one or more request header fields are incorrect in the current request (precondition failed) 413 -- the requested resource is larger than the size allowed by the server (Request Entity too large) 414 -- the requested resource URL is longer than the length allowed by the server (request-URI Too long) 415 -- the requested resource does not support the request project format (unsupported media type) 416 -- The request contains the range request header field. There is no range indication value in the current request resource range, and the request does not contain the IF-range request header field (requested range not suitable) 417 -- the server does not meet the expectation specified by the request's response CT header field. If it is a proxy server, it may be that the next-level server cannot meet the request (expectation failed) 500 -- the server generates an internal error (internal server error) 501 -- the server does not support the requested function (not implemented) 502 -- the server is temporarily unavailable, sometimes to prevent system overload (Bad Gateway) 503 -- server overload or service suspension (unavailable) 504 -- gateway overload. The server uses another gateway or service to respond to the user. The waiting time is long (gateway timeout) 505 -- the server does not support or reject the HTTP Version specified in the request header (HTTP Version Not Supported) 12029 -- an unknown error occurred while processing the request on the server. the status code returned from the server was: 12029 (cause: the network is disconnected. refresh the page)