I want to post some data to another domain with the enctype equal to multipart/form-data, because I want the unmodified data in the server side.
Here is my test code:

<textarea name=txt rows=20 cols=80>

</textarea>

<script>

function x_domain_post(url, data)

{

    var dd = document.createElement('div');

    var ifrname = client_proxy;

    dd.innerHTML = <iframe id=' + ifrname + ' name=' + ifrname + ' width=0 height=0 ></iframe>;

    document.getElementsByTagName('body')[0].appendChild(dd);

    var ifr = document.getElementById(ifrname);



    var f = document.createElement('form');

    f.action = url;

    f.method = post;

    f.enctype = multipart/form-data;

    f.target = ifr.name;

    f.innerHTML = f.innerHTML + <textarea name='request'>default</textarea>;

    document.getElementsByTagName(body)[0].appendChild(f);

    document.getElementsByName(request)[0].value=data;

    f.submit()

    setTimeout(function(){document.getElementsByTagName(body)[0].removeChild(f);}, 1000);

}



</script>

<button onclick=x_domain_post('http://192.168.232.128/add', document.getElementsByName('txt')[0].value)>

The request in chrome is:

...

Content-Type:multipart/form-data; boundary=----WebKitFormBoundary9zCD31eJSHkdb8ul

...

------WebKitFormBoundary9zCD31eJSHkdb8ul

Content-Disposition: form-data; name=request



a



b



o

------WebKitFormBoundary9zCD31eJSHkdb8ul--

But in IE9:

POST /add HTTP/1.1

...

Content-Type: application/x-www-form-urlencoded

...

request=a%0D%0A%0D%0Ab%0D%0A%0D%0Ao

Any of your help will be appreciated!