Proxy Solace Connection with Javascript

Connection error: connect ETIMEDOUT

From your question I assume that it works with other proxies?
I can use our proxy like this:
curl -I --proxy " http://proxy.domain:81 " " https://target.domain:443 `"

`

For the solace.SessionProperties.url I have tried:

wss://target.domain:443%httpc://proxy.domain:81

wss://target.domain:443%http://proxy.domain:81

socks5 seems to be blocked unfortunately. I could not connect with curl.