(Vercel error today) TypeError: Failed to execute 'fetch' on 'window': …with a request object that has already been used

Aug 20, 4:03 AMSolvedClosed#nextjs

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I'm getting this error when using React Toolkit on POST requests. No changes were made to my application and all was working. Some change was made by Vercel today regarding fetch() or something related that is causing this.

Can be reproduced by trying a POST request with react toolkit.

Vercel StaffAccepted answer

Hi! I'll link the GitHub issue that you opened at Posthog just to track it here too, in case other folks have the same issue: https://github.com/PostHog/posthog/issues/24471

The fix was apparently released in posthog-js@1.157.1 (GitHub comment).

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(Vercel error today) TypeError: Failed to execute 'fetch' on 'window': …with a request object that has already been used - Help - Vercel Community

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