HTTP 421 Misdirected Request vs 500 Internal Server Error
HTTP 421 (Misdirected Request) is a 4xx Client Error response, while 500 (Internal Server Error) is a 5xx Server Error response. 421 indicates that the request was directed at a server that is unable to produce a response for the combination of scheme and authority in the URI. In contrast, 500 means that the server encountered an unexpected condition that prevented it from fulfilling the request. A generic catch-all for server-side errors.
Description
The request was directed at a server that is unable to produce a response for the combination of scheme and authority in the URI.
When You See It
With HTTP/2 when a connection is reused for a domain the certificate doesn't cover.
How to Fix
Retry the request on a new connection.
Description
The server encountered an unexpected condition that prevented it from fulfilling the request. A generic catch-all for server-side errors.
When You See It
When an unhandled exception occurs, a database connection fails, or server code has a bug.
How to Fix
Check server logs for the stack trace. Common causes: unhandled exceptions, database errors, misconfigurations.
Key Differences
421 is a 4xx Client Error response, while 500 is a 5xx Server Error response.
HTTP 421: The request was directed at a server that is unable to produce a response for the combination of scheme and authority in the URI.
HTTP 500: The server encountered an unexpected condition that prevented it from fulfilling the request. A generic catch-all for server-side errors.
You encounter 421 when with HTTP/2 when a connection is reused for a domain the certificate doesn't cover.
You encounter 500 when when an unhandled exception occurs, a database connection fails, or server code has a bug.
When to Use Which
For 421 (Misdirected Request): Retry the request on a new connection. For 500 (Internal Server Error): Check server logs for the stack trace. Common causes: unhandled exceptions, database errors, misconfigurations.