GraphQLHTTPMiddleware - Support Content-Type application/x-www-form-urlencoded? #178
Description
I stumbled on this while testing out some GraphQL calls via Powershell against different APIs. express-graphql supports POSTs with content-type application/x-www-form-urlencoded, but this library does not. Is there any desire to add this support? I'm conflicted because while this content type appears nowhere in the official spec or on the GraphQL learn site, express-graphql does have GraphQL's endorsement. I can work on a PR if you want this.