URI Too Long
What 414 Means
The 414 error on the Nginx Server-Errors indicates uri too long. This typically occurs due to infinite redirect loops appending query parameters.
A 414 error specifically occurs when the URL requested by the client exceeds the `large_client_header_buffers` limit configured in Nginx.
Technical Background
Nginx pre-allocates small memory buffers to read request headers efficiently. If the URL string outgrows these tiny buffers, Nginx throws a 414 to prevent memory corruption.
Standard URLs rarely exceed 2000 characters. If they do, it's typically an architectural flaw.
Common Causes
- Infinite redirect loops appending query parameters
- Extremely massive GET request parameters
- A poorly designed API sending bulk data in the URL
Typical Scenarios
- A web crawler gets caught in a URL loop, appending '?ref=x&ref=y' infinitely.
- A frontend developer mistakenly uses a GET request to pass an entire base64 string instead of a POST.
What to Know
Convert the overly long GET request into a POST request with a payload body, or increase the `large_client_header_buffers` directive.
Frequently Asked Questions
Common questions about Nginx 414 error
It means the web address (URL) you asked for is physically too long for Nginx's memory buffers to process.