CalDAV Gateway

Standardized CalDAV endpoints for calendars whose native servers are non-standard.

WeCom (企业微信) — two-way
https://wecom.caldav.shaolinzhang.com
Normalizes WeCom's REPORT/Depth quirks. Use your WeCom CalDAV username & password.

Lark (飞书 / larksuite) — two-way via API bridge
https://lark.caldav.shaolinzhang.com
Backed by the Lark Calendar API (native Lark CalDAV is read-only). Requires one-time OAuth.

Private infrastructure. Endpoints require authentication.