The sender of the message is the server in the communication chain that was unable to fulfil its function as a gateway, or proxy, as it didn’t receive a response from the next server (or service) within a specific time. This is why the message code also displays the designation ‘Gateway Timeout’. The HTTP 504 response lets the client know that the cause of the failure was due to a timeout during the processing of a request. The server then responds to this with an answer that includes a 504 status code, which for example might include information on a successful processing (HTTP 200), or else information on its failure, in the case of a 504 error. This exchange occurs via notifications through which the client defines a HTTP request. For this reason, HTTP communicates the website’s hypertext, which the client software can in turn convert into text, images, etc. Operating on the application layer, it initiates communication between the client – normally an internet browser – and the corresponding web server hosting the desired content. The Hypertext Transfer Protocol is one of the most important protocols when it comes to the transfer of web content.
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