Throw exception for graphql errors

[acrobat]

I noticed that errors from the graphql api didn't throw errors by our ExceptionThrower plugin. That's because the graphql api return HTTP code 200 even when the api had an error.

The GraphQL spec 6 doesn’t make any mention of HTTP status codes in the case of an error. Additionally, I would suggest that the error you show in your post is an application level error, not an HTTP protocol level error. It’s the same thing as when someone submits a value to an HTML form field that is incorrectly formatted … such as an invalid email address. Your web application returns a 200 HTTP status code because everything is fine at the HTTP protocol level, but displays an error message to the user asking them to supply a valid email address in the form.

See https://git.luolix.topmunity/t/github-api-v4-error-returns-200-status-code/14178/2

So I've adjusted the exception thrower to check HTTP 200 responses for grapql errors, with the early return's in the check function the overhead should be minimal.