Hi,
Thanks for reaching out.
In many cases, you can have CORS issues when your Query is big,
For now, queries are passed in the request header, and there is a limit in the number of characters passed in the URL. For more please check this issue.
A workaround this can be by using GraphQL minifier tool such as https://www.npmjs.com/package/gqlmin where it strips the indentations from the query.
Please let us know if that works for you,
Fares