> The problem is that there is no way to tell whether
> foo.gif?x=0 is or is not the same as foo.gif?x=1
> without downloading them.

But sometimes it is done like this
example.com/script?x=0&y=1&z=3
Where parameters x and y control content while z's purpose is just tracking,
individualisation, bugging.

It would be great one could tell httrack to ignore parameters when it comes to
decide whether link
example.com/script?x=0&y=1&originate=3&track=xAul53f
equals 
example.com/script?x=0&y=1&originate=4&track=xAutb3f
without downloading it.

Thanks