Code 502

HTTP 502 (Bad Gateway) is a server error status code indicating that the server, acting as a gateway or proxy, received an invalid response from an upstream server. It commonly occurs with load balancers, reverse proxies (like Nginx), or CDN configurations when the backend server is unreachable or returns an error.

HTTP 502 errors are diagnosed through server logs, hosting control panels, and uptime monitoring tools like Pingdom or UptimeRobot. Persistent 502 errors can impact Googlebot crawling, leading to crawl errors in Google Search Console's Coverage report and potential ranking drops.