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This article mainly explains "what error codes are in Ajax". The explanation in this article is simple and clear, easy to learn and understand. Please follow the ideas of Xiaobian and go deep into it slowly to study and learn "what error codes are in Ajax" together!

Ajax error codes include: 400 (error request), 401 (unauthorized), 403, 404, 405, 406, 407, 408 (request timeout), 409, 410, 411, 412, 500 (internal server error), 502 (error gateway), 503 (server unavailable), 504 (gateway timeout), etc.

Operating environment of this tutorial: Windows 7 system, Javascript version 1.8.5, Dell G3 computer.

AJAX error codes are

4xx (request error)

These status codes indicate that the request may be in error, preventing the server from processing

400 (Bad Request): The server does not understand the syntax of the request.

401 (Unauthorized): The request requires authentication; the server may return a secondary response to the page requested after login;

403 (Forbidden): The server rejects the request. If you see this status code when googlebot tries to crawl a valid page on your site (you can see this message on the web crawling page under google webmaster tools diagnostics), it is likely that the server host denied googlebot access;

404 (Not Found):

405 (Method Disabled): Disable the method specified in the request.

406 (Not Accepted): Unable to respond to the requested web page with the requested content characteristics.

407 (Proxy Authorization Required): This status code is similar to 401 (Unauthorized), but specifies that the requester should authorize the use of the proxy. If the server returns this response, it also indicates that the requester should use a proxy;

408 (Request timeout): A timeout occurred while the server was waiting for a request.

409 (Conflict): The server encountered a conflict while completing the request. The server must include information about the conflict in the response. The server may return this code in response to a PUT request that conflicts with the previous request, along with a list of differences between the two requests;

410 (Deleted): The server returns this response if the requested resource has been permanently deleted. This code is similar to the 404 (not found) code, but is sometimes used instead of the 404 code when the resource previously existed and now does not. If the resource has been permanently moved, you should specify the new location of the resource using 301;

411 (Valid Length Required): The server does not accept requests that do not contain a Valid Content Length header field.

412 (Prerequisites not met): The server does not meet one of the prerequisites set by the requester in the request.

413 (Request Entity Too Large): The server cannot process the request because the request entity is too large for the server to handle.

414 (URL too long): The URI requested (usually a URL) is too long for the server to process.

415 (Unsupported media type): The requested format is not supported by the requested page.

416 (Requested range does not meet requirements): If the page cannot provide the requested range, the server will return this status code;

417 (Expectations not met): The server did not meet the requirements of the "Expectations" request header field.

423 (Lock Error)

5XX (Server Error)

These status codes indicate that the server encountered an internal error while processing the request. These errors may be server errors rather than request errors;

500 (Internal Server Error): The server encountered an error and was unable to complete the request.

501 (Not yet implemented): The server does not have the capability to fulfill the request. For example, the server might return this code if it doesn't recognize the request method;

502 (Bad Gateway): The server, acting as a gateway or proxy, received an invalid response from an upstream server.

503 (Server Unavailable): The server is currently unavailable (due to overload or maintenance downtime). Usually, it's temporary.

504 (Gateway timeout): The server is acting as a gateway or proxy, but does not receive requests from upstream servers in a timely manner.

505 (http version not supported): The server does not support the HTTP protocol version used in the request.

Ajax is a technology that allows you to update parts of a web page without having to reload the entire web page, enabling asynchronous updates of the web page by exchanging small amounts of data with the server in the background.

Thank you for reading, the above is the content of "what error codes are in Ajax", after learning this article, I believe that everyone has a deeper understanding of what error codes are in Ajax, and the specific use needs to be verified by practice. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!

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