Plugin API, HTTP path is always /

[i-am-kenny]

Describe the bug
When inspecting the HTTP request from within a plugin, the URL path is always /

To Reproduce
Steps to reproduce the behavior:

1. Use v0.1.0-alpha.9
2. Create a simple plugin
3. Add a hook for the router_service that prints out the URL path

fn router_service(
    &mut self,
    service: BoxService<RouterRequest, RouterResponse, BoxError>,
) -> BoxService<RouterRequest, RouterResponse, BoxError> {
    ServiceBuilder::new()
        .map_request(|req: RouterRequest| {
        	println!("{}", req.context.request.url().path());

        	req
        })
        .service(service)
        .boxed()
}

4. Make GraphQL requests to the server with varying paths URL /, /graphql/foo, graphql/bar
5. Note that it is always / regardless of the request path

Expected behavior
I would expect requests that go to host.com/graphql/foo would have a path value of /graphql/foo in the url struct.

Additional context
We include the operation name in our URL path, so being able to validate that the operation name in the path matches the operation name in the body would be helpful.