urllib3 v2.6 removed `HTTPResponse.getheader(name, default)` in favor of `HTTPResponse.headers.get(name, default)`, see https://github.com/urllib3/urllib3/pull/3622 Changed from `resp.raw.getheader` to `resp.headers.get` for compatibility. Fixed `test_response_headers` test to verify getheader() works properly. Change-Id: Ic0fab4ca6407f5435d87aa02d533f3eb826f5b3b Signed-off-by: Anthony Roussel <anthony@roussel.dev>