414URI Too Long
The URL itself is longer than the server is prepared to read.
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Almost always a GET request carrying data that should have been in a POST body, such as a long form submitted by the wrong method, or a query string built in a loop that never stopped growing.
Limits vary by server but sit in the region of a few thousand characters, so a URL long enough to trigger this is usually a bug rather than a legitimate request.
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Status codes
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1xx Informational (4)
2xx Success (10)
3xx Redirection (8)
4xx Client errors (31)
5xx Server errors (16)