Adjust Page class to incorperate request body

[XiangRongLin]

With #567 I added a quick fix for the new continuations API. Instead of a GET request with headers and query parameters, now a POST request with the same information inside the request body is necessary. In that PR i just added that made that new custom request right inside the Extractor and passed on the continuations key as the id field of Page

This needs to be properly done, by also adding a request body field or something similiar to the Page class

[FireMasterK]

Maybe a Map?

You can technically store everything you need there 🙂

[Stypox]

I don't think a map is a good idea, it would make everything more difficult to understand and to test. I'd go with just a new request-body field in the class.

[XiangRongLin]

Closed by #599