• new configuration directive:
  H2Padding [ 'prefer' | 'enforce' ] numbits
  to control padding of HTTP/2 payload frames. 'numbits' is a number from 0-8,
  where 0 disables padding and 1-8 is the power of 2 that frame lengths are
  rounded to. The default is 4 bits, e.g. frames are padded to be a multiple
  of 16 (2^4).
  While 'enforce' always applies this to all payload frames, the default 'prefer'
  option caps frame length at H2TLSWarmUpSize when in effect.