Web server error messages
The following 500 group status codes indicate that the server knows that it is in an error state or is unable to complete the request. As a rule, such errors in the normal operation of the site should not be. With a good organization of the site engine (backend), the logic of requests is processed without errors from the server and leads, in the worst case, to errors of the group 400 - client errors.
|500||The server detected something that it did not expect, and could not complete the request. Often this error is associated with incorrect execution of the program code.|
|502||The server received an invalid response from another server in the request chain.|
|503||The server is currently unavailable (due to server overload or because it is disconnected from service). In most cases, this is a temporary condition associated with an increased load.|
|504||The server did not receive a timely response from another server in the chain of requests that it accessed when trying to load a web page or execute another request by the browser.|
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