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HTTP status codes and web errors explained for developers.
Most Common Error Codes
High severity first — the most frequently searched error codes
500
High
Internal Server Error — the server encountered an unexpected condition preventing request fulfillment
5 common causes
502
High
Bad Gateway — the server received an invalid response from an upstream server
4 common causes
503
High
Service Unavailable — the server is temporarily unable to handle requests due to overload
4 common causes
404
Medium
Not Found — the server cannot find the requested resource at the given URL
4 common causes
403
Medium
Forbidden — the server understood the request but refuses to authorize it
4 common causes