fnReloadAjax(url): two requests

lngphp

I'd like to refresh my table when new item is added. I use such code:

[code]
$("#frm_create_user").submit(function() {

var formData = getFormData($("#frm_create_user"));

$.ajax({
type: "POST",
url: getApiUrl("/user"),
dataType: "json",
contentType: 'application/json',
data: JSON.stringify({user:{user_ref: formData.user_ref}}),
}).done(function(r) {

oTable.fnReloadAjax(getApiUrl("/users?sSearch=" + r.user.userid));

});

return false;

});
[/code]

But for some reason, I can see two requests instead of one.
The first one is correct - `http://symfony/app_dev.php/api/users?sSearch=kZoh1s23&_=1394204041433`

And the second one is confusing - `http://symfony/app_dev.php/api/users?sSearch=kZoh1s23&sEcho=3&iColumns=8&sColumns=&iDisplayStart=0&iDisplayLength=25&mDataProp_0=userid&mDataProp_1=user_ref&mDataProp_2=password&mDataProp_3=vpn_password&mDataProp_4=status_id&mDataProp_5=expire_account&mDataProp_6=created&mDataProp_7=&sSearch=&bRegex=false&sSearch_0=&bRegex_0=false&bSearchable_0=true&sSearch_1=&bRegex_1=false&bSearchable_1=true&sSearch_2=&bRegex_2=false&bSearchable_2=true&sSearch_3=&bRegex_3=false&bSearchable_3=true&sSearch_4=&bRegex_4=false&bSearchable_4=true&sSearch_5=&bRegex_5=false&bSearchable_5=true&sSearch_6=&bRegex_6=false&bSearchable_6=true&sSearch_7=&bRegex_7=false&bSearchable_7=true&iSortCol_0=0&sSortDir_0=asc&iSortingCols=1&bSortable_0=true&bSortable_1=false&bSortable_2=true&bSortable_3=true&bSortable_4=true&bSortable_5=true&bSortable_6=true&bSortable_7=true&_=1394204041505`

If I remove `fnReloadAjax()` line, these two requests gone so that it looks like it is caused by `fnReloadAjax()`

How may I fix it to have only `http://symfony/app_dev.php/api/users?sSearch=kZoh1s23&_=1394204041433` requests?