WebDAV supports conditional requests with the `If` header. Conditional read [is currently implemented](https://github.com/apache/opendal/blob/b6cf44f7b8a1523409e0e998e478c996ac970f03/core/services/webdav/src/config.rs#L108) but conditional write is not. #5218
WebDAV supports conditional requests with the
Ifheader. Conditional read is currently implemented but conditional write is not.#5218