@Override
    default StreamDecoder newDecoder(ByteBufAllocator alloc) {
        return newDecoder(alloc, 0);
    }
Construct a new {@link StreamDecoder} to use to decode an {@link HttpMessage}.

@param alloc the {@link ByteBufAllocator} to allocate a new {@link ByteBuf} for the decoded
             {@link HttpMessage}.
core/src/main/java/com/linecorp/armeria/common/encoding/StreamDecoderFactory.java