You should set this property to a file containing
response page for client's request.
wodWebServer always saves content in the file on local
disk. If Filename property isn't set by your code,
wodWebServer creates temporary file in temporary directory,
uses it as storage space, and then deletes the file when
destroyed. Filename is set by wodWebServer only if you
write to Body property,
and Filename wasn't set before that. Since most of the time you will return content
to the client, specifying Filename property will cause
content from the disk to be sent.
You can access contents of this file directly by
reading/writing to a file on disk, or you can use Body property
which is wrapper that loads and saves body for you - but
presents it as String variable.