Is Custom HTTP headers available on Sailfish OS OpenVPN?

Is Custom HTTP headers working on Sailfish os OpenVPN?
i need it.

The openvpn binary on 3.4+ (at least) does support http-proxy connection types, and you can set custom headers with http-proxy-option. So basically: yes. But I don’t know whether this works via the GUI.

First, I wanted to start a rant about mixing up network layer matters with protocol layer matters, but I was wrong: this is actually an OpenVPN feature I didn’t know about! Funnily enough, in the past, I built something similar, imitating an IMAP session over which OpenVPN was tunneled. Nice to see that this has meanwhile been built into OpenVPN for convenience, and thank you, @rpntech, for pointing me to that!