- extension_headers validation - header prefix must be ‘x-goog-‘ (with a trailing hyphen)
- http_method validate, explicitly name the datasource attribute that is failing validation
- remove redundant http_method validation that is no longer needed
- re-add ‘testAccPreCheck()’ to acceptance tests, to ensure necessary GOOGLE_* env vars are set for Acceptance tests.
- remove unused code from datasource
- use URL signature (base64 encoded) as data source ID instead of full URL