Client error codes
The status codes from this group indicate that an error probably occurred in the client request due to which the server was unable to correctly process the incoming request. In general, your server is OK and he just received an incorrect request, for example, the page has ceased to exist and the web server informs about this message 404 - the page was not found.
|400||The server does not understand the syntax of the request.|
|401||The request requires authentication. Before accessing the resource, the client must be authorized by the server.|
|403||The server rejects the request. Unlike the unauthorized response 401, authentication does not matter.|
|404||The server could not find the requested resource. For example, the server usually returns this particular code if a request is received for a page that is not on the site.|
|408||The request you sent to the website server (for example, a request to load a web page) took longer than the website server was willing to wait. In other words, your connection to the site has expired.|
|410||The server returns this response in the case when the resource requested by the client has been permanently deleted. It is similar to code 404, but is sometimes used instead of 404 for resources that previously existed but are no longer available. If the resource is constantly moved, you must use code 301 to indicate the new location of the resource.|
|429||The client sent too many requests for a certain period of time ("speed limit").|
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