502
HTTP 502 Bad Gateway
5xx Server Error
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Tailwind
5xx Server Error
RFC 7231, Section 6.6.3
What is HTTP 502 Bad Gateway?
The 502 (Bad Gateway) status code indicates that the server, while acting as a gateway or proxy, received an invalid response from an upstream server. This commonly occurs when a web server (like Nginx) receives an invalid or no response from an application server (like PHP-FPM, uWSGI, or a reverse proxy target).
Common Use Cases
- Application server crash behind reverse proxy
- Upstream service timeout
- PHP-FPM process unavailability
- Load balancer with unhealthy backend