Find out what the HTTP504 Gateway Timeouterror means, why it occurs in Nginx, Cloudflare, Docker, and Kubernetes, and how to properly diagnose and resolve the issue. The 504 Gateway Timeouterror occurs when a browser's HTTP request to the server doesn't respond in time, preventing it from being completed. How to Fix a 504 Gateway TimeoutError - Lifewire lifewire.com. Learn what a 504 Gateway Timeouterror means, how it differs from other 5xx errors, and how to triage fixes with developers or hosting providers. Encountering a ‘504 Gateway Timeout’ error in Nginx can be frustrating, especially when it disrupts the availability of your web applications. This error indicates that the server, while acting as a gateway or proxy, did not receive a timely response from the upstream server. The HTTP504 Gateway Timeout server error 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. A 504error is a timeout while Nginx is acting as a gateway or proxy. Nginx may be waiting to connect to the upstream, send the request to it, or read the response from it. The exact stage usually appears in the Nginx error log. 504ProxyTimeout: A HTTP status code indicating that the server, acting as a gateway or proxy, did not receive a timely response from an upstream server. The 504error is typically returned by the proxy or gateway after an extended period of waiting for a response from the origin server.