implement `foreach_request` callback for H3
implement `foreach_request` callback for H3

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