CL_HTTP_CLIENT, Typo3/Mittwald server

Question

We are using CL_HTTP_CLIENT to access a service on the web (another part of the same project). In other words, the SAP-system acts as a client.
The "other side" is using Typo3/Mittwald technology (German).
If I understand correctly, Typo3 is a PHP-based CMS, running on the Mittwald HTTPD. In our case, it is hosted at the Typo3/Mittwald corporation
Does anybody have experience with a similar situation?

Answer 1

The small success I reported in my posting of the 6th of March has made me think.
It’s probably a matter of 2 requests.
In “normal” interactive use (a human user and a web browser) I think the following happens:
Request 1 is a simple GET.
The response to request 1 has:
a status 403
a body containing an HTML with a log-in form
a cookie
The user executes the HTML, fills in the form and submits. This sets off request 2.
Request 2 is a POST. It has:
user-ID and password in form fields “name” and “pass”
a Referer (because it comes from a web page)
a cookie (the cookie received in the response to request 1)
      The response to request 2 has:
a status 200 (we hope)
a body containing the XML
In my calls from SAP (CL_HTTP_CLIENT) so far we only have one exchange:
Request 1 is a POST. It has:
user-ID and password in form fields “name” and “pass”
a Referer (because I fake it)
NO cookie
      The response to request 1 has:
a status 200 (yeah!)
a body containing an HTML with a log-in form and the “Welcome to Drupal” stuff
My guess is that the system gets confused (possibly because the request does NOT contain a cookie). Authentication succeeds, but we get the wrong content.