use heap for building UDP chunks
use heap for building UDP chunks

devnexen/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,h2o/h2o,yannick/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,devnexen/h2o,cwyang/h2o,cwyang/h2o,devnexen/h2o,cwyang/h2o,yannick/h2o,yannick/h2o,cwyang/h2o,devnexen/h2o,h2o/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,cwyang/h2o,devnexen/h2o,h2o/h2o,devnexen/h2o,yannick/h2o,cwyang/h2o,yannick/h2o