make examples-http1client able to send requests via HTTP/2
make examples-http1client able to send requests via HTTP/2

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