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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →HTTP 414 means a server is refusing a request because the target URI—the address identifying the requested resource—is longer than that server is willing to interpret. The fix depends on what created the long request and which part of the network returned the error: visitors can try a shorter or intended link, while site operators should inspect the request and redirect chain before changing a limit.
What does HTTP 414 mean?
The current standardized name is URI Too Long. Older software and error pages may call it “Request-URI Too Long” or “Request-URI Too Large.” In RFC 9110 §15.5.15, the IETF defines 414 as the server refusing to service a request because its target URI is longer than the server is willing to interpret: RFC 9110 §15.5.15.
This is about the request target, not by itself the size of data in the request body. A 414 therefore points to an overlong URI or request line; it is different from a failure caused solely by an oversized upload body.
Why might you get a 414 error?
RFC 9110 describes 414 as rare and identifies several possible situations. A long address is not automatically evidence of an attack; reproduce the failure and inspect what the client actually sent.
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- Too much data was put in the URL. A form intended to submit data with POST may accidentally use GET, placing its fields in the query string. A large set of fields can make the resulting address too long. See RFC 9110 §15.5.15 and MDN’s 414 reference.
- A redirect loop keeps extending the address. Misconfigured redirect rules can repeatedly add a path component or query parameter, producing a longer request at each step. The standard lists an infinite redirect loop as a possible cause: RFC 9110 §15.5.15.
- A server or intermediary rejected the request under its policy. The client, a proxy, CDN, load balancer, web server, or application may be the component that refuses the target. The 414 definition is relative to what that server is willing to interpret.
- Suspicious traffic may be involved. The standard mentions an attack exploiting potential security holes as another possible situation. Treat that as one possibility to investigate, not the default explanation.
How to troubleshoot a 414 response
If you are visiting a website
- Try the site’s intended form, button, or link rather than copying and editing a long address manually.
- If the workflow permits it, remove unnecessary query parameters and retry. Do not remove parameters that the site needs to complete the action.
- If the error persists, tell the site owner what action produced it and share the failing URL or redirect behavior through an appropriate support channel. Redact credentials, personal information, and private tokens before sharing.
If you operate the website or service
- Reproduce and capture the exact request. Record the method, full path and query string, and the sequence of redirects. Avoid exposing secrets in logs or tickets.
- Find the component that sent 414. Trace the request through any browser-facing proxy, CDN, load balancer, web server, and application. Check response headers, access and error logs, and the behavior of each hop. Change the limit only on the component that rejected the request.
- Check how the URL was constructed. If a form or client intended to submit a body but sent GET with a large query, correct the method and request construction. Reduce unnecessary URL-carried state where practical.
- Inspect redirects in order. Look for a rule that repeatedly adds a path prefix, suffix, or query component. Repair the rule or loop rather than accommodating an ever-growing target.
- Investigate suspicious requests when warranted. If the request is unexplained, assess relevant logs and security signals. A 414 alone does not establish malicious activity.
- Adjust a request-target limit only when needed. If a legitimate application request requires a longer URI, consult the documentation for the component that returned 414, select a value appropriate to that deployment, and test through the same network path.
Is there a universal URL length limit?
No universal accepted-URL cutoff follows from the 414 definition. RFC 9112 §3.1 recommends that HTTP senders and recipients support, at a minimum, request-line lengths of 8000 octets: RFC 9112 §3.1. That is a protocol support recommendation, not a guarantee that every browser, intermediary, server, or end-to-end deployment path accepts every request of that length. Limits and encoding behavior can differ across the path.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to address 414 in NGINX
NGINX documents the large_client_header_buffers directive for setting the number and size of buffers used to read large request headers. A request line must fit in one buffer; if it does not, NGINX returns 414. A request-header field that exceeds one buffer instead results in 400. The documented default is large_client_header_buffers 4 8k;, and the directive is available in http and server contexts: NGINX core module documentation.
The request-line ceiling is the size of an individual buffer, not the combined capacity of all buffers. For example, large_client_header_buffers 4 16k; illustrates a larger per-buffer size; it is not a universal recommendation or a tested setting. Choose values based on legitimate request requirements and deployment constraints, then validate the effective configuration and test through the same path that produced the error. NGINX defaults can vary by release or configuration, so verify the documentation for the version in use. For another server or intermediary, use that product’s own documentation rather than applying an NGINX directive.
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