> It seems okay (the ' was converted into %27, but RFC2616 
> says that it should be okay as %27 =always= ')

And all other links are also okay:

HTTrack mirror complete in 3 seconds : 8 links scanned, 7 
files written (463 bytes overall) [1700 bytes received at 
566 bytes/sec], 2.0 requests per connection
(No errors, 0 warnings, 0 messages)