Adding Proxy/CONNECT headers?

[SalmaanP]

I see requests through proxy can be made by setting environment variables HTTP_PROXY & HTTPS_PROXY. This seems to work fine, but is there a way to add CONNECT headers? I can already see user-agent header is added, any way to add custom headers? curl provides an option --proxy-header for this.

example request would be

CONNECT www.example.com:443 HTTP/1.1
Host: www.example.com:443
User-Agent: Go-http-client/1.1
CustomHeader: blah

[na--]

No, unfortunately CONNECT requests / different proxies per request are currently not supported. #1045 is the issue that currently tracks that, though we will probably create a separate overarching issue about custom transports (#1045 (comment)) that would sum up all of the use cases for them.

[SalmaanP]

Makes sense. I've created a small PR specifically for adding proxy headers, let me know if it can be merged standalone without the other features you mentioned.

[mstoykov]

Closing as this is a duplicate of #1045