HTTP 414 URI Too Long

In short: The requested address is longer than the server processes.

In more detail: Servers and proxies limit the length of the URL, often to about 8 KB (nginx: 8 KB, others less). Overlong addresses usually come from huge query strings, for example when a lot of data is passed via GET.

In Depth

When it occurs

• A form with very many fields that sends via GET instead of POST.
• An endless redirect loop that keeps appending more parameters.

What you can do

1. As a user: shorten the address or open the page again from the home page.
2. Developers: send large amounts of data via POST and check redirects for loops.

See also: HTTP Status Codes Overview, HTTP