Function plan_conditionals 

pub async fn plan_conditionals(
    if_header: Option<&IfHeader>,
    resolver: &dyn DavIfStateResolver,
    request_path: &DavPath,
    prefix: &str,
    request_scheme: &str,
    request_host: &str,
    method: DavMethod,
    headers: &HeaderMap,
    resource: DavConditionalResource<'_>,
) -> Result<DavConditionalPlan, DavConditionalEvaluationError>

Enforces WebDAV If first, then applies the RFC 9110 HTTP conditional planner.

Tagged destination/resource conditions therefore fail with WebDAV 412 before the request-target HTTP conditions are considered. Product code still chooses the metadata snapshot passed to the HTTP planner.

Errors

Returns an error when DAV If or HTTP conditional evaluation fails.