martin.parter, it worked! Thanks so much, I was going nuts!!!! I also read the issue you pointed to, very interesting. Even if all servers should just work here, it does not seem to be the case in real life (I guess it's something easy to misconfigure) so I agree not setting "Connection: false" by default would make the standard lib more user friendly.

I guess I'll now talk to the maintainers of the upstream library and suggest the following:

* Reading this issue and the one you pointed to.
* Reviewing their server configuration.
* Migrating to http.client, specially if they don't make to fix the server configuration.

This can now be closed, thanks so much again <3