Access via temporary URL

[wachsylon]

Maybe it is possible to access data via the api having only the temporary url. It seems like the temporary url and an expiration date of this url has to be provided in the header of an request. I will have a deeper look.

[wachsylon]

@d70-t in this pr i added a second authentication by providing other environment variables for temporary urls. these have to be provided as query arguments in the url i.e. params in the session calls.