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Cleaned up HTTPS->HTTP proxy code

entered in vim on RPoJ

20190824

Courtesy of Javier on comp.misc (plus a bit I added for /.):

$ cat doit.cgi
#!/bin/bash
#depends on curl and gridsite-clients
#change this to your server
server="rpoa"

ths="http:\/\/$server\/cgi-bin\/doit.cgi\?"
req=$(urlencode -d "$1")
req2="$ths$(urlencode "$req")"
dom=$ths"https:\/\/"$( printf "$1" | awk -F[/:] '{print $4}' )

#print your mime header!
if [ "$req"=="https://slashdot.org/" ]; then
        printf "%s\n\n" "Content-Type: text/html"
fi
curl -sS -I "$req" | \
        printf "%s\n\n" "$(grep "^Content-Type:" | sed 's@text/plain@text/html@')"

#harvest and massage your content, changing hyperlinks to this proxy
curl -sS "$req" | \
  sed "/href=\"[[:alnum:]]/ s@href=\"@href=\"$req2@g;          \
       /href=\"\//          s@href=\"@href=\"https://$dom@g;   \
       /src=\"[[:alnum:]]/  s@src=\"@src=\"$req2@g;            \
       /src=\"\//           s@src=\"@src=\"$dom@g;             \
                            s@"$req2"http@http@g;              \
                            s@https://http://@http://@g"