I am trying to debug the preflight request to know it works well.

So, I made request by axios with custom header

  var config = {
    headers: {
      "Content-Type": "triggering/preflight"
    }
  }
  axios.get(http://www.example.com/api/`,config)
    .then((res)=> {
      console.log("API work");
    })
    .catch(err=>{
      console.log("API NG");
      console.log(err);
  });

It is supposed to be used with preflight request.

However in both on Chrome and on Firefox, There is only POST request in dev tools network tab.

OPTIONS request is not shown.

I googled around and some chrome version(76~) doesn't show preflight.

enter link description here

I am not sure my version(95) is the same or not, but on firefox there is no OPTIONS shown too.

Is there the most basic way to check if preflight works ??