[Bug 1931815] [NEW] the %{remote_ip} output format is broken on proxied connections

[Bill Yikes]

Public bug reported:

This is how a Tor user would use cURL to grab a header, and also expect
to be told which IP address was contacted:

curl --ssl --socks4a 127.0.0.1:9050 -L --head -w '(effective URL =>
"%{url_effective} @ %{remote_ip}")' "$target_url"

It's broken because the "remote_ip" is actually just printed as the
127.0.0.1 (likely that of the proxy server not the remote target host).

tested on curl ver 7.52.1

** Affects: curl (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1931815

Title:
  the %{remote_ip} output format is broken on proxied connections

Status in curl package in Ubuntu:
  New

Bug description:
  This is how a Tor user would use cURL to grab a header, and also
  expect to be told which IP address was contacted:

  curl --ssl --socks4a 127.0.0.1:9050 -L --head -w '(effective URL =>
  "%{url_effective} @ %{remote_ip}")' "$target_url"

  It's broken because the "remote_ip" is actually just printed as the
  127.0.0.1 (likely that of the proxy server not the remote target
  host).

  tested on curl ver 7.52.1

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