I'm running htdig 3.1.6 on Suse-linux in local_url
mode, so no apache is running.
If an filename is encountered that contain a space
character, htdig wants to read the file without this
start_url: http://localhost/Linux NetMag
results in a failed read of /home/berni/LinuxNetMagfax.html
This problem occures also if start_url reads an
index.html listing this space-filename.
I also tried double-quoting the attribute-value,
replacing the space by "\ ", "\\ ", "&nbsp;".