POST data to iframe

iframe.html

<iframe id="iframe" src="" class="iframe" seamless="" name="iframe"></iframe>

script.js

var form=document.createElement('form');
var spDTO=document.createElement('input');

form.method='POST';
form.action='http://localhost:7170/test';
form.enctype='application/json';
form.target='iframe';

spDTO.value='{some:"value"}';

form.appendChild(spDTO);

form.submit();