Support for HTTPS

[tomaka]

This is a long-term issue. Don't expect it to be implemented within a few weeks or months.

[tomaka]

HTTPS is just HTTP over SSL, there is no additional mechanism in the HTTP part itself (the only exception is Strict-Transport-Security which is handled by the library user).
So instead of directly supporting HTTPS I could instead use traits for sockets, and the user chooses whether to use regular sockets or SSL-enabled sockets.

This would require changes in the standard I/O library though, because the Acceptor and Stream traits alone don't allow timeouts.

[tomaka]

This would require changes in the standard I/O library though, because the Acceptor and Stream traits alone don't allow timeouts.

See rust-lang/rust#15802

[tomaka]

Everything should be ok now. We could implement this with an optional dependency towards openssl (disabled by default I guess, because that dependency is usually painful and not needed).