Yoshihisa CF Work Sec-Lab

Routes:
  GET  /healthz
  GET  /headers              -> echo request headers
  GET  /status/:code         -> return given status code
  GET  /set/:key/:value      -> set response header key:value
  GET  /set?key=&value=      -> same, via query string
  GET  /bytes/:n             -> return N bytes (cacheable)
  GET  /delay/:seconds       -> delay N seconds then respond
  ALL  /echo                 -> echo method/headers/body