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504
Server Error

504 Gateway Timeout

The server did not receive a timely response from the upstream server.

Definition (RFC 9110)

HTTP status code 504 504 Gateway Timeout is defined in RFC 9110 (HTTP Semantics), Section 15.6.5 — the current authoritative specification for HTTP semantics, published June 2022, which obsoletes the older RFC 7231 and RFC 2616.

Description

The 504 Gateway Timeout status code indicates that the server, while acting as a gateway or proxy, did not receive a timely response from an upstream server needed to complete the request.

Common Causes

  • Upstream server is slow
  • Long-running database query
  • Network issues between proxy and upstream
  • Proxy timeout too short

How to Fix

  • Increase proxy timeout values
  • Optimize upstream server performance
  • Check network connectivity
  • Implement request queuing for long operations

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Related Status Codes

500
500 Internal Server Error
The server encountered an unexpected condition that prevented it from fulfilling the request.
 501
501 Not Implemented
The server does not support the functionality required to fulfill the request.
 502
502 Bad Gateway
The server received an invalid response from an upstream server.
 503
503 Service Unavailable
The server is temporarily unable to handle the request.
 505
505 HTTP Version Not Supported
The server does not support the HTTP protocol version used in the request.
 507
507 Insufficient Storage
The server cannot store the representation needed to complete the request (WebDAV).

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