Squid-2.6.STABLE19 have sslproxy* directives.
Can it support forward proxying https?
Below is part of squid FAQ:
"Unsupported Request Method and Protocol" for ''https'' URLs.
The information here is current for version 2.3
This is correct. Squid does not know what to do with an https URL.
To handle such a URL, Squid would need to speak the SSL protocol.
Unfortunately, it does not (yet).
Normally, when you type an https URL into your browser, one of two
things happens.
* The browser opens an SSL connection directly to the origin server.
* The browser tunnels the request through Squid with the CONNECT
request method.