414 URI Too Long

HTTP 414 URI Too Long indicates the URI requested by the client is longer than the server is willing to interpret. Often caused by overlong query strings or buggy clients sending POST data as GET.

Extremely long query strings, infinite redirect loops accumulating query params, or attacks attempting to overflow URL parsers.

• Query string with hundreds of params
• Infinite redirect appending tracking params
• Form mistakenly using GET instead of POST
• Buffer overflow attempt

• Convert GET to POST when sending large data
• Trim unnecessary query parameters
• Detect and break redirect loops
• Increase server URL buffer size if legitimate (Nginx large_client_header_buffers)

HTTP/1.1 414 URI Too Long
Connection: close