Forum OpenACS Q&A: The filter does not work

Hi!
I met problem when I tried to create my own filters. I add my own
filter in the /tcl/ad-security.tcl file, using the same style the
other filters use.

ad_register_filter trace GET /world.* ad_add_cookie

proc_doc ad_add_cookie{conn args why} {

set db [ns_db gethandle]
if ![catch {ns_db dml "insert into user_tracking values
(22 ,'wuwuu..')"} errmsg ] {}

ns_db releasehandle $db
return filter_ok

}

There is no error msg in log when I start aolserver by ./bin/nsd -kt
nsd.tcl. And have: [02/Oct/2001:17:07:31][20271.1024][-main-] Notice:
Registering trace filter ad_add_cookie for GET /world.html with
priority 10000

But when I access that page, seems the filter function does not work,
for I cannot see any change in the db.

what's the possible problem? How can I check whether it works?

Thanks

--Xian

My guess is that a higher-priority filter is running and is catching the request before your filter gets it.  The docs on ad_register_filter mention a priority level, try bumping up the priority on your filter.  Alternatively, since the request processor be default does things with .tcl, .adp, and .html, try naming your file with a different extension, and modify the filter to catch that.  For instance, register a filter for *.xhdp and name your file world.xhdp .