Submit to PHP connection to MySQL

submit.js

let question = "test question';
let answer = 'test answer';
let form = new FormData();
form.append("question", question);
form.append("answer", answer);

fetch("http://www.guidosalimbeni.it/-- xxx xxx xxx --- .php", {
  // URL
  // body: JSON.stringify(form), // data you send.
  body: new URLSearchParams(form),

  cache: "no-cache", // *default, no-cache, reload, force-cache, only-if-cached
  headers: {
    "content-type": "application/json",
  },
  method: "POST", // *GET, POST, PUT, DELETE, etc.
  mode: "no-cors", // no-cors, cors, *same-origin
  redirect: "follow", // *manual, follow, error
  referrer: "no-referrer", // *client, no-referrer
})
  .then((resp) => {
    console.log(resp);
  })
  .then((err) => console.log(err));