Encoded URL
http%3A%2F%2Fwww.foo.com%2Findex.php%3Fid%3Dqwerty
Use this command to decode the URL
echo "http%3A%2F%2Fwww.foo.com%2Findex.php%3Fid%3Dqwerty" | sed -e "s/%\\([0-9A-F][0-9A-F]\\)/\\\\\\\\\\x\\1/g" | xargs -0 echo -e
Decoded URL (result of command)