5xx Server ErrorHTTP Status Code Reference

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

The server, while acting as a gateway or proxy, did not get a response in time from the upstream server. The backend took too long to respond, and the gateway gave up waiting.

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Common Causes

  • Backend server is too slow to respond
  • Long-running database query or computation
  • Network latency between proxy and backend
  • Upstream server is deadlocked or hung

How to Fix

  1. 1Increase gateway/proxy timeout settings
  2. 2Optimize slow backend operations and database queries
  3. 3Add caching to reduce backend load
  4. 4Break long operations into async jobs returning 202

Example

HTTP 504 Gateway Timeout
GET /api/report HTTP/1.1 → Nginx (proxy, 30s timeout)
→ Backend takes 60s to generate report
→ 504 Gateway Timeout

Related Server Error Codes

500

Internal Server Error

501

Not Implemented

502

Bad Gateway

503

Service Unavailable

505

HTTP Version Not Supported

506

Variant Also Negotiates

507

Insufficient Storage

508

Loop Detected

510

Not Extended

511

Network Authentication Required

Commonly Referenced Status Codes

The most frequently searched HTTP status codes

200OK201Created204No Content301Moved Permanently302Found400Bad Request401Unauthorized403Forbidden404Not Found422Unprocessable Content429Too Many Requests500Internal Server Error502Bad Gateway503Service Unavailable

Related Tools

HTTP Status LookupAPI Request BuildercURL GeneratorHTTP Header ViewerHTTP Header DiffRedirect Checker