What does HTTP status 414 (Uri Too Long) mean?

 
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HTTP_STATUS_REQUEST_TOO_LARGE HTTP_STATUS_UNSUPPORTED_MEDIA

HTTP_STATUS_URI_TOO_LONG

This often happens when large form data is placed in a query string, a redirect loop keeps appending parameters, or an identifier is encoded inefficiently. Proxies can impose smaller limits than the application.

Use a request body for large input where the API supports it, bound redirect state, and inspect the exact request line after all client-side redirects.

Long query strings, redirect loops that repeatedly append parameters, and data incorrectly placed in the URI are common causes. Capture the final request target seen by the server or proxy. Moving data into a request body is appropriate only when the application method and endpoint are designed to accept it.

RFC 9110: HTTP Semantics


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