I figured out that "=" was messing up the
template code, so I substituted it's hex equivalent "%3D" for both
of the equal signs. Some target servers can parse this, and some can not, thus creating
a problem for the users.
To my knowledge this interpretation is incorrect: it is the task of the web browser to
convert %3D back to appropriate symbols, and a correct URL would reach the server either
way. May I ask you for an example?