JSFiddle - React, Tailwind, and code Playground

HTML

<body>
</body>

JavaScript

function loadDoc() {
		var xhttp = new XMLHttpRequest();
		
		xhttp.onreadystatechange = function() {
			if (this.readyState == 4 && this.status == 200) {
				document.write("<br/>OK: " + xhttp.responseText);
				setTimeout(loadDoc, 3000);
			}
		};

		xhttp.onerror = function() {
			document.write("<br/>ERRO: readyState: " + xhttp.readyState + "status: " + xhttp.status + " responseText: " + xhttp.responseText);
		};

		xhttp.open("POST", "http://192.168.0.50/teste.php", true);
		xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		xhttp.send("fname=Henry&lname=Ford");
	}

	loadDoc();