Function ensure_service_double_submit_token 

pub fn ensure_service_double_submit_token(req: &ServiceRequest) -> Result<()>

Ensures an Actix service request contains matching CSRF cookie and header values.

This uses default_csrf_token_names. Prefer ensure_service_double_submit_token_with_names in products that configure service-specific token names.

Errors

Returns CsrfError when the cookie or header is missing, empty, or does not match.