This is a testharness.js-based test.
FAIL Visibility of defaulted headers during interception assert_unreached: unexpected rejection: withUA FAIL - expected "custom_ua", got "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.77.34.5 Safari/537.36" Reached unreachable code
Harness: the test ran to completion.

