IT Toolbox
Error code

HTTP 431 — Request Header Fields – Large

Query headers exceed a server or proxy limit.

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HTTP 431. — Request Header Fields — Large.

Domain : Web.Priority: Medium

What does this error mean?

Query headers exceed a server or proxy limit.

Probable causes

  • large cookies.
  • Matt Auth.
  • proxy.

Verification and resolution

  1. Test new session.
  2. measuring headers.
  3. control server limit.
Precaution: Delete all cookies can mask an application problem.

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Quick diagnostic.

To diagnose HTTP code 431 in the Web domain, start with the following check: Test session new. Then compare the result to this probable cause: large cookies. Store context and the time of appearance to compare behavior before and after correction. Priority level indicated: Average.

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