URI Too Long

4xx Client Error

Last updated: July 19, 2026

The URL is longer than the server is willing to interpret.

Description

Usually caused by clients encoding large payloads into query strings. The fix is to use POST with a body instead.

Rare — most servers allow URLs up to 8KB or more. Return 414 if you have strict URL limits.

RFC 9110 §15.5.15

HTTP response

HTTP/1.1 414 URI Too Long
Content-Type: application/json

{"error":"URI Too Long"}

Node.js (Express)

res.status(414).json({ error: "URI Too Long" });

Go (net/http)

w.WriteHeader(http.Status414)

Python (Flask)

return jsonify({"error": "URI Too Long"}), 414

Payload Too Large

The request body is larger than the server is willing or able to process.