http3: trigger the request probe earlier
http3: trigger the request probe earlier

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