The 504 Gateway Timeout error occurs when a browser's HTTP request to the server doesn't respond in time, preventing it from being completed. Whatdoes the 504 Gateway Timeout Errormean? Common HTTP504error message variations.Whatdoes the 504 Gateway Timeout Errormean? When you try to load a website in your browser, it sends a request to the webserver that hosts the site. Web APIs: Programming interfaces. Web API reference.The HTTP504 Gateway Timeout servererror response status code indicates that the server, while acting as a gateway or proxy, did not get a response in time from the upstream server in order to complete the request. Learn how to fix the 504 Gateway Timeout error code on yoursite. Simple, easy to follow solutions to bring yoursite back online. AnHTTP504 appears when one server waits too long for a response from another. At some point, the wait ends and a “Gateway Timeout” response is sent out. Usually, the issue isn’t with the website itself, but with an intermediary component, such as Nginx... Learn what anHTTP504 Gateway Timeout errormeans, why upstream servers fail to respond in time, and how to fix it. How to Fix the 504 Gateway Timeout Error in WordPress Site lifewire.com. Explore this detailed guide to find answers, understand the 504 Gateway Timeout meaning, and learn how to fix it without any hassle.