502 Bad Gateway — Causes and How to Fix It

502 Bad Gateway appears when a server acting as a gateway or proxy receives an invalid response from an upstream server. The request reaches the gateway, but the backend service fails to respond correctly. As a result, the browser cannot load the page. Quick Fix Reload the page after a few seconds. Clear browser cache

503 Service Unavailable — Causes and Practical Fix

503 Service Unavailable means the server is running but cannot process the request right now. The web server is reachable, but the application or backend service is temporarily unable to respond. This error usually appears during traffic spikes, maintenance, or backend failures. Quick Fix Reload the page after a few seconds. Check server CPU and