Implement CalDAV/Card Service Discovery via SRV records (RFC 6764)
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This will allow services that provide SRV records for CalDAV and CardDAV to be detected automatically by domain name.
For instance, if a user enters "icloud.com" as the host name, the corresponding services can be detected:
$ host -t SRV _caldavs._tcp.icloud.com _caldavs._tcp.icloud.com has SRV record 0 0 443 caldav.icloud.com. $ host -t SRV _carddavs._tcp.icloud.com _carddavs._tcp.icloud.com has SRV record 0 0 443 contacts.icloud.com.The advantage is that when CalDAV and CardDAV services are on different servers (like on iCloud), they can be used in one account when SRV services discovery is used.
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A quick investigation which services provide CalDAV/CardDAV SRV records (alphabetically):
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Implemented with and 2f5622edaf84a15f239c6bdaa483ca3da40b8958 and 2e6a3efd253a986cf177f812d47b64f0e611f1e0.