Change webcal:// to http://

What clients don't pick up on the webcal link? I know that both OS X and KDE deal with it properly. Would such clients still behave the same with an http link?

Firefox on Windows doesn't know what to do with webcal links by default. However, setting the content type is enough for it to at least try to spawn your iCalendar-associated application. I second killing the webcal substitution, unless those browsers that do understand it don't understand the content type header correctly. Attached patch removes the call.

This change is a bit of a problem for me. I'm converting our Macintosh Users Group site to Drupal and a webcal link works much better, when its clicked iCal auto-launches and prompts to subscribe to the feed. With "http" the link instead downloads as an .ics document.

I can edit the module source code back to webcal but would it make sense to make this a module setting rather than hard-coding it one way or the other?

Its being served as text/calendar which I believe is correct. Here are the headers:

HTTP/1.1 200 OK
Date: Tue, 13 Feb 2007 19:40:43 GMT
Server: Apache/1.3.37 (Unix) mod_fastcgi/2.4.2 mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 FrontPage/5.0.2.2635.SR1.2 mod_ssl/2.8.28 OpenSSL/0.9.7a PHP-CGI/0.1b
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Content-Disposition: attachment; filename="calendar.ics";
Expires: Sun, 19 Nov 1978 05:00:00 GMT
X-Powered-By: PHP/4.4.4
Set-Cookie: PHPSESSID=d2b95084543c16ed14268145eef60f49; expires=Thu, 08 Mar 2007 23:14:03 GMT; path=/; domain=.acamug.org
Cache-Control: max-age=1209600
Expires: Tue, 27 Feb 2007 19:40:43 GMT
Last-Modified: Tue, 13 Feb 2007 19:40:43 GMT
Connection: close
Content-Type: text/calendar; charset=utf-8

The problem is that, even with the correct MIME type, with the http: protocol Safari will download the calendar file then launch iCal with the downloaded file rather than the original URL. The only way to pass the URL directly to iCal so it can subscribe to the feed is to use the webcal: protocol.