How would I change my httpmodule or IIS to handle an entry whereby I type:

/mycategory/
or
/mycategory/2007/05/05/

normally it will treat this as a directory, and look for:
/mycategory/default.aspx
or
/mycategory/2007/05/05/default.aspx

Obvsiously it is all dynamic, so this woudln't work.
If I add to IIS .*, then it will process EVERYTHING, which I do not want.

Thanks,
Mick
 

You need a mod_rewrite like url rewriting tool such as IIS Mod-Rewrite, IIS Rewrite, or IIRF. I strongly recommend IIS Mod-Rewrite, but IIRF is an acceptable free solution.

You can convert an incoming url from

/mycategory/2007/05/05

to

/default.aspx?cat=mycategory&year=2007&month=05&day=05

by using the following rewrite configuration:

RewriteEngine On
RewriteRule ^/([^/]+)/?([0-9]*)/?([0-9]*)/?([0-9]*)/?  /default.aspx?cat=$1&year=$2&month=$3&day=$4 [L,QSA]

Hope this helps

You can use a HttpModule to intercept all the requests coming in for a specific directory in your case "mycategory/2007/05/05" and change the URL on the fly so that it points to the page which will process the request.