I'm trying to mirror a subdirectory:

<http://www.site.com/pdf/>*
I ignore the robots.txt file

I get an error "first file can't be found"

I know there are a bunch of pdf files (unknown names and quantity) in this
directory that are linked to from other folders.  When I use my browser to go
this this directory, it redirects me to www.site.com.  I can view a file: 
www.site.com/pdf/file01.pdf

Any ideas on how to mirror this specific directory?  I'm new to HT, so I may
not have provided enough information.

I tried adding a filter +www.site.com/pdf/*.pdf