When executing a query through javascript I get a CORS error:
Access to fetch at 'http://access.mainnet.nodes.onflow.org:9000/v1/scripts?block_height=sealed' from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
This error happens when querying from testnet and mainnet. Also happens from localhost or from a site running in Vercel.
The rpcs I tried:
https://access-testnet.onflow.org/
http://access.devnet.nodes.onflow.org:9000/
http://flow-testnet.g.alchemy.com:443/
(also tried their mainnet counterparts)
