xhr post
var url = "https://example.com/";
var xhr = new XMLHttpRequest();
xhr.open("POST", url);
xhr.setRequestHeader("Content-Type", "application/json");
xhr.onreadystatechange = function () {
   if (xhr.readyState === 4) {
      console.log(xhr.status);
      console.log(xhr.responseText);
   }};
var data = `{
	"name": "Bob"
}`;
xhr.send(data);
