Silent failure when the server reports an error.

[Stubbs]

Describe the bug
When I make a call to a server, especially a raw query, and I get an error reponse back from the server there's no way to see this in the calling class.

To Reproduce
Steps to reproduce the behavior:
Make a raw call to the GraphQL server with a syntax error for example. The server I'm calling (Invision Community Server) returns an error like this

{
    "errors": [
        {
            "message": "Syntax Error: Expected {, found Name \"MutateForums\"",
            "extensions": {
                "category": "graphql"
            },
            "locations": [
                {
                    "line": 1,
                    "column": 63
                }
            ]
        }
    ]
}

Expected behavior
At the very least I'd like the error to be returned from the get method, but perhaps throw an error I can catch.

Would using Guzzle be an option? As a Laravel client the dependency is already there from Laravel.

Anyway, getting the error back would be a good start.