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<script> let xhr; function postRequest() { let data = collectData(); xhr = new XMLHttpRequest(); xhr.onreadystatechange = processData; xhr.open("POST", "http://localhost:8080/api/rest/person/save", true); xhr.setRequestHeader("Content-Type", "application/json"); xhr.send(data); } function processData() { if (xhr.readyState == 4 && xhr.status == 200) { let response = xhr.responseText; console.log(response); document.getElementById("resp").innerHTML=response; } } function collectData() { let data = { id: parseInt(document.getElementById("uid").value), name: document.getElementById("un").value, city: document.getElementById("city").value }; console.log(data); return JSON.stringify(data); } </script>