Session authentication

Drupal 7 Services 3 Session Authentication with CSRF Token

I really had a bad hour figuring out how Drupal services.module (Version 3.x) session authentication works. The documentation is poor and there are several issues stating out problems.

Finally I was able to find a way out of the Service REST jungle and I'd like to share the results with you (and myself for the future) if we should ever run into the same problems again.