HTTP 504 Gateway Timeout — What It Means & How to Fix It

The HTTP 504 Gateway Timeout status code indicates a server acting as a gateway or proxy did not receive a timely response from the upstream server. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Similar to 502, but specifically a timeout issue rather than an invalid response.. The upstream server is taking too long to respond.. Common with slow database queries, external API calls, or heavy processing.. Proxy timeout settings determine how long to wait before returning 504.. The request may still be processing on the upstream server.. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: The upstream server is processing the request too slowly.. A database query or external API call is taking too long.. Network latency between the proxy and upstream server.. The upstream server is overloaded and cannot respond within the timeout period.. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Retry the request as the upstream server may have been temporarily slow.. If you control the server, optimize slow queries or API calls.. Increase proxy timeout settings if the backend legitimately needs more time.. Check upstream server performance and resource utilization.. Consider implementing async processing for long-running operations.. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our HTTP Status Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.