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Configuring Auto-Discovery for CalDAV and CardDAV

In order to simplify the configuration of CalDAV and CalDAV clients, service discovery can be configured according to RFC 6764 which suggests means of adding DNS records and well-known URIs to the primary domain.

Defining well-known URIs for iRony

Well-known URIs are used when setting up CalDAV and CardDAV clients to automatically detect the service configuration, mainly the server URI. So when configuring a CalDAV client for the account sample@example.org, the client will take the domain part of the account name and send a HTTP(S) request to https://example.org/.well-known/caldav which is expected to redirect to the service URL using a HTTP mechanisms, e.g. with a 301 Moved Permanently response.

The sample Apache config file packaged with iRony already contains rewrite rules pointing to the /iRony/ path. If the service is installed at a different path, adjust the two rewrite rules accordingly:

RewriteRule ^.well-known/caldav   /<path-to-iRony>/ [L,R=301]
RewriteRule ^.well-known/carddav  /<path-to-iRony>/ [L,R=301]

There are good reasons to run the CalDAV and CardDAV service at root level of your web server. Especially to make it work with the Mac OS X 10.6 Addressbook this is a must [1].

Assuming iRony is set up at root on dav.example.org the well-known URIs have to be configured for the host serving example.org and redirecting to the fully qualified location of the iRony service.

RewriteEngine On
RewriteBase /
RewriteRule ^.well-known/caldav   https://dav.example.org/ [L,R=301]
RewriteRule ^.well-known/carddav  https://dav.example.org/ [L,R=301]

SRV Service Labels and Service TXT Records

Beside the well-known URIs, it’s also recommended to add DNS entries for the service discovery protocol as described in RFC 6764, Chapters 3. and 4.

Footnotes

[1]https://code.google.com/p/sabredav/wiki/OSXAddressbook