Valid Accept header should include `*/*` instead of just `text/html`! about gql

[talentlessguy]

could you please make a PR with the fix? thanks in adv

[MichaelFedora]

I will try sure, I found some better logic;

• see if Accept header exists
• if it does, get the index of application/json, text/html, */*, and text/plain
  1. if application/json, */*, or text/plain is first, run query
  2. if running graphiql, and text/html is first, serve graphiql
  3. if no good Accept header exists, return 400
• if no Accept header, run query

Does this make sense to you? Doesn't need the ?raw=true query param anymore.