Clarification for `Accept: */*`

[tobias-tengler]

The spec is pretty clear on what to do if the Accept header is not specified or has a value of either application/graphql-response+json or application/json. It's not so clear to me though, which response Content-Type the server should choose in the case of Accept: */* (especially during the legacy watershed period). It would be great if the spec could clarify this part.