nmrao : I don't think you can see it on readyapi. I used wireshark to dump it. It's a specific http method to join https servers trough proxies.
Samy : Ok, no support of the connect method thanks ! The second wireshark dump shows exactly what happened when readyapi trying a post to an https server with a proxy, I cut the proxy response. This attempt is a failure if it was the question.
The thing is I could see the expected User-Agent as posted earlier along with screen shot and could not reproduce the problem mentioned by you i.e., neither two User-Agents nor incorrect User-Agent value. All I can see the expected only using both http and https.