Unused?: the url tag in the DPI start_send_page command

Everything that sends the start_send_page DPI command also sends a url
attribute with it, but I think this attribute is always ignored.

Dillo processes  the command  in capi.c  but it  does nothing  with it
because the Cache is already set up to receive the following raw data.
So  it doesn't  look at  any attributes.   The only  other thing  that
receives a start_send_page is the view  source DPI and it doesn't look
at any of  the attributes either (it extracts a  url from the previous
tag in the stream, which it then sends back to Dillo to be ignored).

So what is  this attribute for?  Future use?  Or  is it something that
just never got used?

Regards,

Jeremy Henty