AS3 → AS4: reintroduce URL to HTTPGraphQLRequest
Hi 👋 I'm migrating from AS3 to AS4. I see [in the migration guide for GraphQLRequest](https://www.apollographql.com/docs/apollo-server/migration#graphqlrequest) that

> Specifically, the http field is now an HTTPGraphQLRequest type instead of a type based on the Fetch API's Request object. **The HTTPGraphQLRequest object does not contain a URL path**, and its headers field is a Map (with lower-case keys) rather than a Fetch API Headers object.

Removing the `url` property is blocking me from updating, unless I can work around this. That's because I have a plugin that extracts the URL and some other features of the HTTP request in order to perform authentication.

* Why was `url` removed?
* Can `url` be added back?
* Is there some work around I can use?

Thanks in advance!