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

No response

Steps To Reproduce

No response

What Wagmi package(s) are you using?

wagmi

Wagmi Package(s) Version(s)

wagmi@2.12.25

Viem Version

viem@2.21.35

TypeScript Version

typescript@5

Anything else?

No response

[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.