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HTTP/4xx (Client Error)

414 URI Too Long

The URI requested by the client is longer than the server is willing to interpret.

❓ Why does this happen?

Huge query strings (e.g. serialized filters or base64 data in GET params) exceed the server's URL length limit (often 8 KB).

✅ How to fix it

Move large parameters into a POST body, or raise large_client_header_buffers in Nginx.

Return or handle 414 in your stack

// app/api/resource/route.ts
export function GET() {
  return Response.json(
    { error: "URI Too Long", status: 414 },
    {
      status: 414
    }
  );
}

Live 414 mock endpoint

Point your app, tests, or retry logic at this free public URL to reproduce a real 414 response (CORS enabled, optional ?delay=ms up to 5000).

https://castov.com/api/mock/414

Frequently Asked Questions

What does HTTP Status 414 mean?
The URI requested by the client is longer than the server is willing to interpret.
Why am I getting a 414 status code?
Huge query strings (e.g. serialized filters or base64 data in GET params) exceed the server's URL length limit (often 8 KB).
How do I fix a 414 URI Too Long error?
Move large parameters into a POST body, or raise large_client_header_buffers in Nginx.
How can I test how my app handles a 414 response?
Send a request to https://castov.com/api/mock/414 — it returns a real 414 URI Too Long response with CORS enabled. Add ?delay=2000 to simulate a slow server.

Other 4xx status codes

400401402403404405406407408409410411412413414415416417418421422423425426428429431451499

Browse the full HTTP status codes directory or troubleshoot terminal errors in the Error Fix Encyclopedia.