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Temporary Chat Refresh Causes “Page Not Found” with HTTP 431 Error (Session Not Restored)

OpenAI Developer Community April 6, 2026
Source

When using a temporary chat session, refreshing the browser results in a “Page Not Found” error instead of restoring the session or loading a new temporary chat interface.

Steps to Reproduce:

  1. Open a temporary chat session

  2. Start chatting

  3. Click the browser refresh button

  4. Observe the result

Expected Behavior

After refreshing, the application should either:

  • Restore the existing temporary chat session, or

  • Redirect to a new/default temporary chat screen

Actual Behavior

The page fails to load and displays:

  • “Page Not Found” or “This page isn’t working”

  • HTTP ERROR 431

Environment Details:

  • Device: MacBook Pro (M1)

  • OS: macOS

  • Browser: Google Chrome

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