useReadContract not observing access-control-max-age response header

[studiov-dev]

Check existing issues

• I checked there isn't already an issue for the bug I encountered.

Describe the bug

I'm using useReadContract with { query: { refetchInterval: 250 } }.

With every refresh, the browser sends an OPTIONS preflight request. The RPC response headers includes access-control-max-age: 600 .

I would expect that another OPTIONS preflight request would be sent only after 600 seconds.

For a dapp that relies on fast refetches, sending preflight requests unnecessarily hurts performance.

Link to Minimal Reproducible Example

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Steps To Reproduce

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What Wagmi package(s) are you using?

wagmi

Wagmi Package(s) Version(s)

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Viem Version

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TypeScript Version

typescript@5

Anything else?

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[github-actions]

Hello @studiov-dev.

Please provide a minimal reproduction using StackBlitz, TypeScript Playground (for type issues), or a separate minimal GitHub repository.

Minimal reproductions are required as they save us a lot of time reproducing your config/environment and issue, and allow us to help you faster.

Once a minimal reproduction is added, a team member will confirm it works, then re-open the issue.

[github-actions]

This issue has been locked since it has been closed for more than 14 days.

If you found a concrete bug or regression related to it, please open a new bug report with a reproduction against the latest Wagmi version. If you have any questions or comments you can create a new discussion thread.