Basic Authentication within a POST-request using HTTPClient

Hey, I want to call a service with HTTPpost behind a BasicAuth using HTTPClient like this:

client = HTTPClient.new body = { ... } client.set_auth(domain, user, password) client.post (domain, body)

Receive a 401! If I try it with GET, it's perfectly working, so I know the user/ password is correct.

It seems, using POST, the set_auth-method is not called.

Does anyone has an idea or solved this problem?

thx g