Bad Message 431: Causes, Fixes, and Prevention for Request Header Fields Too Large

At 1Byte, we treat “bad message 431” as a small error with outsized consequences: it can stop logins, break checkout flows, and turn a perfectly healthy app into a support-ticket factory. When a browser shows this message, it’s rarely “random.” Instead, it’s the network stack doing exactly what it was designed to do—refuse a request whose headers have become too heavy to carry safely.

Behind the scenes, request headers are where modern web apps stash identity, state, routing hints, A/B test assignments, analytics IDs, and a surprising amount of accidental cruft. Under light traffic, sloppy header hygiene is mostly invisible; under...

Source: https://blog.1byte.com/bad-message-431/

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