HTTP Status Code 421
The status code 421, also known as "Misdirected Request," is an error code used in communication between web servers and clients (like your web browser). It indicates that the server understood your request perfectly well, but it cannot process it for some reason. Here's a breakdown of what a 421 status code means:
- Server understands the request: The server isn't confused about what you're trying to do.
- Server can't process the request: There's a configuration issue or some other problem preventing the server from fulfilling your request.
- Possible causes: This error can happen due to misconfigured servers, issues with HTTP/2 connection reuse, or a load balancer sending a request to the wrong server.
Typically, you won't see this error message directly on a webpage you visit. But, if you're encountering trouble loading a webpage and come across an error code, it's possible a 421 error might be behind the scenes.
Other 4xx Status Codes
- 400 Bad Request
- 401 Unauthorized
- 402 Payment Required
- 403 Forbidden
- 404 Not Found
- 405 Method Not Allowed
- 406 Not Acceptable
- 407 Proxy Authentication Required
- 408 Request Timeout
- 409 Conflict
- 410 Gone
- 411 Length Required
- 412 Precondition Failed
- 413 Payload Too Large
- 414 URI Too Long
- 415 Unsupported Media Type
- 416 Range Not Satisfiable
- 417 Expectation Failed
- 418 I'm a teapot
- 421 Misdirected Request
- 422 Unprocessable Entity
- 423 Locked
- 424 Failed Dependency
- 425 Too Early
- 426 Upgrade Required
- 428 Precondition Required
- 429 Too Many Requests
- 431 Request Header Fields Too Large
- 451 Unavailable For Legal Reasons
