When checking the Accept header the charset is expected to be utf8 not utf-8 #120
Description
Expected Behaviour
A request with the HTTP header:
Accept: application/json; charset=utf-8 is accepted as a GraphQL request
Actual Behaviour
The request is rejected with:
HTTP 406 Not Acceptable Debug Information
I think the check here is wrong and should be looking for utf-8 not utf8.
https://github.com/graphql/graphql-http/blob/v1.22.0/src/handler.ts#L593