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Motiviation: 691bc1690e9542d6093b91ffe1fbdf7d075bcd42 made writeUtf8 consistent with String.getBytes() so that it never throws. 94f27be59b637c74763cc3b9fd27cf628b59f7bd provided a writeUtf8 method which takes a ByteBufAllocator to do an appropriately sized buffer allocation. Result: - Assume writeUtf8 will not throw in HTTP/2 codec - Use the new writeUtf8 method Result: Cleaner code in codec-http2.