414 URI Too Long: HTTP Status Code Meaning, Causes, and Fixes

What 414 URI Too Long means

414 URI Too Long means the request line (the URL with all query parameters) exceeds the server's parsing buffer. Typical limits are 4KB-8KB. This usually happens when GET requests are used to send what should be a POST body: large lists in query strings, encoded binary data in URLs, or query-string explosion from chained tracking parameters. The fix is almost always to switch to POST.

When servers should return it: Return 414 when the request URI exceeds the server's configured maximum.

Common causes

Massive query strings (hundreds of parameters)
Base64-encoded data in URL parameters
Tracking parameter sprawl (UTM + Google + Facebook + custom)
GET request being used where POST should be

How to fix 414 URI Too Long

Move data from query string to POST body
For search APIs, accept POST with JSON body for complex queries
Increase server limit (Nginx: large_client_header_buffers)
Strip unnecessary tracking parameters

Example response

HTTP/2 414
content-type: text/plain
URI too long

Related status codes

Frequently Asked Questions

What is the typical URL length limit?

IE caps at 2KB, modern browsers handle 8KB+, most servers default to 4-8KB.

Should search use GET or POST?

Use GET for short queries (cacheable, bookmarkable). Use POST for very large or sensitive search bodies.

More references

For a one-page reference of all HTTP status codes, see the HTTP cheat sheet. For testing API responses, try the API Tester tool. For inspecting responses on the command line, the curl cheat sheet covers the most common flags.