HTTP 400 Bad Request vs 504 Gateway Timeout
HTTP 400 (Bad Request) is a 4xx Client Error response, while 504 (Gateway Timeout) is a 5xx Server Error response. 400 indicates that the server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing. In contrast, 504 means that the server, acting as a gateway or proxy, did not receive a timely response from the upstream server.
Description
The server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing.
When You See It
When sending malformed JSON, missing required fields, or invalid query parameters.
How to Fix
Check the request body format, validate all required fields, and ensure proper encoding.
Description
The server, acting as a gateway or proxy, did not receive a timely response from the upstream server.
When You See It
When an upstream server is too slow to respond within the proxy's timeout window.
How to Fix
Increase proxy timeout settings. Optimize upstream server performance. Check for long-running queries.
Key Differences
400 is a 4xx Client Error response, while 504 is a 5xx Server Error response.
HTTP 400: The server cannot process the request due to malformed syntax, invalid request message framing, or deceptive request routing.
HTTP 504: The server, acting as a gateway or proxy, did not receive a timely response from the upstream server.
You encounter 400 when when sending malformed JSON, missing required fields, or invalid query parameters.
You encounter 504 when when an upstream server is too slow to respond within the proxy's timeout window.
When to Use Which
For 400 (Bad Request): Check the request body format, validate all required fields, and ensure proper encoding. For 504 (Gateway Timeout): Increase proxy timeout settings. Optimize upstream server performance. Check for long-running queries.