<form>
        <input id = "sendLink" type = "text" placeholder = "insert a link here">
    </form>

xmlhttp.open('POST', 'http://host:8453/page.htm', true);
        xmlhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
        xmlhttp.send($link);

"headers": {
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
    ...
    more headers here
    ...
    "User-Agent": "Mozilla/5.0"
},
"httpVersion": "1.1",
"method": "POST",
"post": {
    "http://sameURL.com": ""
},
"postRaw": "http://sameURL.com",
"url": "/page.htm"