net/http: HTTPS proxies support

[ailg]

net/http supports HTTP proxies, where HTTPS is achieved with CONNECT. It would be nice to add support for HTTPS proxies (https://www.chromium.org/developers/design-documents/secure-web-proxy), where the client first establishes a TLS connection to the proxy.

http://tip.golang.org/src/net/http/transport.go?#L754

// Note: no support to https to the proxy yet.

Maybe Transport.DialTLS (http://godoc.org/net/http#Transport) could be used for that. Currently it says:

// DialTLS specifies an optional dial function for creating
// TLS connections for non-proxied HTTPS requests.

[ianlancetaylor]

CC @bradfitz

[gopherbot]

Change https://golang.org/cl/54770 mentions this issue: net/http: HTTPS proxies support

[gopherbot]

Change https://golang.org/cl/68550 mentions this issue: net/http: HTTPS proxies support