We did just clarify this in the spec: https://github.com/httpwg/http-extensions/commit/49bcb4fddb8a8c294749ec9d81a236cde4df94b0 https://github.com/httpwg/http-e

We did just clarify this in the spec: https://github.com/httpwg/http-extensions/commit/49bcb4fddb8a8c294749ec9d81a236cde4df94b0 https://github.com/httpwg/http-extensions/commit/49bcb4fddb8.... Hopefully that, plus the tests we'll add in https://bugs.chromium.org/p/chromium/issues/detail?id=960375 https://bugs.chromium.org/p/chromium/issues/detail?id=960375 will help other vendors align their behavior with developer expectations.