Make sure that content-length header can never be deleted #504
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Once the response is
commit
ted, the headers can't be edited anymore, which is exactly what we want in this case.Unfortunately, this can't be added to the tests, because the way responses and
ActionController::Live
work in tests just doesn't allow it (in fact, the tests already "test" for the presence of this header, and the tests still succeed even though in production the header is not present).Fixes #503.