HTTP 414 URI Too Long — Request URL Exceeds Server Limit

HTTP 414 URI Too Long occurs when the URL exceeds the server's maximum length, typically due to excessive query parameters or misconfigured redirects. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Most servers limit URL length to 2,048-8,192 characters. nginx defaults to 4,096 characters for the URI. Apache defaults to 8,190 characters. GET requests encode all data in the URL, which can exceed limits. Redirect loops can append parameters until the URL exceeds the limit. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: GET request with too many or too long query parameters. Redirect loop appending parameters on each iteration. Form using GET method with large data payload. Base64-encoded data passed in the URL. Server configured with a very low URI length limit. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Convert GET requests with large data to POST requests (data goes in the body). Check for redirect loops that accumulate query parameters. Increase server URI limit: nginx: large_client_header_buffers 4 16k; Apache: LimitRequestLine 16384. Shorten URLs by using path parameters instead of query strings where possible. If passing large data, use request body instead of URL parameters. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

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