Fix graphql endpoint flow. Replaced fetch for host override.

[NorOldBurden]

No description provided.

[pyramation]

this looks like the OLD naming!

[yyyyaaa]

I have a few questions:
The PR could have simply been:

1. Add headers to GenerateOptions interface
2. Pass options.headers through to fetchSchema()
3. Add CLI --header parsing
   Why did we remove fetch here? fetch is supported anywhere and simply works.

Was there a specific bug with fetch (SSL issues, proxy problems, Node version compatibility)?

[yyyyaaa]

Was Host header override the specific issue you hit? Can you share the error or scenario? I need to know the exact scenario that's not working that you run into here. Plz provide some steps to reproduce

[NorOldBurden]

Was Host header override the specific issue you hit? Can you share the error or scenario? I need to know the exact scenario that's not working that you run into here. Plz provide some steps to reproduce

As I showed back in the meeting
https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_request_header
The fetch doesn't support for the list forbidden list override where host is one of them.