Код:
function processExtImg() { var imgLink = document.querySelector("input[name='url_to_img']").value; var url = chatx_server + "imgur_uploader.php"; var xhr = new XMLHttpRequest(); xhr.open("POST", url, true); xhr.setRequestHeader("Content-Type", "application/json"); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { generateImageTagAndSend(xhr.responseText); } }; xhr.send(JSON.stringify({ urlToImg: imgLink })); }