Upstream failure code
A 502 is an HTTP status code indicating a bad gateway error—a server acting as an intermediary received an invalid response from an upstream server.
When you see 502 Bad Gateway in your browser, the website's backend servers aren't communicating properly.
Unlike a 404 (page not found), a 502 suggests the problem is temporary and server-side.
Five hundred units
upstream · downstream · backend · frontend · API · connection · protocol · CDN
IDEA.org / Words / 502
Upstream failure code
A 502 is an HTTP status code indicating a bad gateway error—a server acting as an intermediary received an invalid response from an upstream server.
When you see 502 Bad Gateway in your browser, the website's backend servers aren't communicating properly.
Unlike a 404 (page not found), a 502 suggests the problem is temporary and server-side.
1. HTTP — 500, Five hundred units; 404 (HTTP error code); response (Answer to stimulus); request (Formal act of seeking); header · upstream · downstream · backend · frontend · API · connection · protocol · CDN
2. troubleshooting — refresh, Restore energy or newness; retry (Attempt something again); wait (Delay until later); reload (Fill with ammunition again); patience · workaround · escalate · debug · diagnose · restore · recover · reboot · restart
HTTP response status502 ≠ 200 Number after 199; success · OK · healthy · connected · responsive
fault attribution502 ≠ 403 HTTP access refusal; 404 · bad request · unauthorized · forbidden · your fault
Word data: Linguabase (CC0) · www.idea.org/words/502