ServiceWorker

bf8f0375 - Refinements and description of Service-Worker-Allowed. (#1409)

Refinements and description of Service-Worker-Allowed. (#1409) * Require Service-Worker-Allowed to be same-origin to the script URL (#1307) * Add non-normative explanation of Service-Worker-Allowed (#1405) and other mitigations. The text is highly inspired by https://infrequently.org/2014/12/psa-service-workers-are-coming/.