414 / Request-URI Too Long

“The URI provided was too long for the server to process.“ — wikipedia

“The server is refusing to service the request because the Request-URI is longer than the server is willing to interpret. This rare condition is only likely to occur when a client has improperly converted a POST request to a GET request with long query information, when the client has descended into a URI "black hole" of redirection (e.g., a redirected URI prefix that points to a suffix of itself), or when the server is under attack by a client attempting to exploit security holes present in some servers using fixed-length buffers for reading or manipulating the Request-URI.“ — ietf

414 / code reference(s)
Rails HTTP Status Symbol
:request_uri_too_long
← return