Hey thanks so much for responding!

The following code indeed worked.

Req.new(
  url: url,
  connect_options: [
    proxy_headers: [
      {"proxy-authorization", "Basic " <> Base.encode64("user:pass")}
    ],
    proxy: { :http, "my.proxy.com", 22225, [] },
    transport_opts: [ verify: :verify_none ]
  ]
)
|> Req.get()

I’ll make a PR with updated docs. And if I can understand what’s going on with setting http_proxy and https_proxy, I will make a PR for that too when I have a moment. This is a great library! thanks for your efforts on this!

I haven’t tested but this should work:

Req.get!(
  url,
  connect_options: [proxy: {:http, "localhost", 22225, []}],
  proxy_headers: [{"proxy-authorization", "basic " <> Base.encode64("user:pass")}]
)

There is hardly any documentation for this in Req (Req — req v0.6.2) and very scarce in Mint (Mint.HTTP — Mint v1.9.0) so if you get this to work, a PR with docs improvements would be very appreciated. We have an open issue, Support http_proxy and https_proxy environment variables · Issue #394 · wojtekmach/req · GitHub, to support http_proxy and https_proxy env vars so that would probably be even better way to solve this.

If your proxy has some sort of untrusted X509 cert but you want to use it anyway, you can also use :cacertfile instead of verify: :verify_none:

Req.new(
  url: "https://www.google.com/",
  connect_options: [
    proxy_headers: [
      {"proxy-authorization", "Basic " <> Base.encode64("user:pass")}
    ],
    proxy: { :http, "192.168.1.65", 8888, [] },
    transport_opts: [ 
      # verify: :verify_none,
      cacertfile: "/mnt/c/chgeuer/FiddlerRoot.pem"
    ]
  ]
)
|> Req.get!()