HTTP 431 Request Header Fields Too Large Error - Meaning & Fix
The HTTP 431 status code means the server cannot process your request because the HTTP headers are excessively long. This issue may arise from either too many headers or a single header being too large. Common culprits include lengthy Referer URLs or excessive cookies.
Main causes
The total size of the request headers exceeds the server's limit.
A single header field's size is too large.
The Referer URL included in the header is excessively long.
The request includes too many cookies, increasing the header size beyond acceptable limits.
# Request example curl -X GET https://sandbox.oxylabs.io/ -H 'Accept: text/html' -H 'Accept-Encoding: gzip, deflate' -H 'User-Agent: Mozilla/5.0'
Try Scraper API with 5K results
Common fixes
Check the server's response for the "Upgrade" header to identify the required protocol.
Modify the client's request to support the protocol specified by the server's "Upgrade" header.
Ensure that the client and server both support the upgraded protocol.
Restart the client application to apply the new protocol settings and retry the request.
# Response example HTTP/1.1 431 Request Header Fields Too Large Content-Type: text/html; charset=UTF-8 Content-Length: 49431 - Headers Too Large
Forget HTTP errors with Scraper API
Web scraper API
Public data delivery from a majority of websites
From
49
Common scraping HTTP error codes
Useful resources
Get the latest news from data gathering world
Scale up your business with Oxylabs®
GET IN TOUCH
General:
hello@oxylabs.ioSupport:
support@oxylabs.ioCareer:
career@oxylabs.io
Certified data centers and upstream providers
Connect with us
Advanced proxy solutions
Resources
Data Collection
Innovation hub
oxylabs.io© 2024 All Rights Reserved