This is called "Secure Web Proxy". This is not a standard, but it is supported 
by Chromium and Firefox.
https://www.chromium.org/developers/design-documents/secure-web-proxy

This helps against DPI in some countries like China and Turkmenistan. Actually, 
I'd like to see support too.

https://community.openvpn.net/openvpn/ticket/594

On 03/16/2016 01:14 AM, Jason Haar wrote:
> Yeah, instead of opening a TCP socket to a proxy port (eg 3128) and sending 
> "GET url..." proxy commands, you set up a TLS/TCP socket to a different proxy 
> port
> and then send your proxy commands. squid-3.X supports it and it means we can 
> securely (actually, privately would be a better word) run proxied clients over
> the Internet. So I was thinking that if openvpn supported TLS proxies, then 
> we could run openvpn through a true TLS layer - at the moment if you run 
> openvpn
> on (say) TCP/443, that can be picked up by layer7 firewalls as being 
> non-HTTPS traffic (more correctly, non-TLS traffic). If you encapsulated 
> openvpn inside
> TLS, it would look to the world identical to HTTPS traffic
>
> On Wed, Mar 16, 2016 at 9:07 AM, Gert Doering <g...@greenie.muc.de 
> <mailto:g...@greenie.muc.de>> wrote:
>
>
>
> -- 
> Cheers
>
> Jason Haar
> Information Security Manager, Trimble Navigation Ltd.
> Phone: +1 408 481 8171
> PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1
>
>
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