The file /etc/profile.d/profile.sh sets /some/ of the proxy environment variables, but sets them in lower-case for the key names. Unfortunately, many programs expect them in upper case. So, could the following change to the profile.sh script be made (apply same logical change for gopher, https, etc...):

Instead of:

        HTTP_PROXY=*)
            http_proxy="${val}"
            export http_proxy

use:
        HTTP_PROXY=*)
            http_proxy="${val}"
            export http_proxy
            HTTP_PROXY="${val}"
            export HTTP_PROXY

and then later:

f test "$PROXY_ENABLED" != "yes" ; then
    unset http_proxy https_proxy ftp_proxy gopher_proxy no_proxy
    unset HTTP_PROXY HTTPS_PROXY FTP_PROXY GOPHER_PROXY NO_PROXY
unset PROXY_ENABLED