使用ajax发布表单，然后将相同的表单提交给其他URL

Why my form is not again submitting to another URL after ajax submit.

with the below script i want to post form with ajax and then submit same form to other url.

first my form will submit to Ajax URL (http://www.mywebsite.com/insertdata.php) and then it same form will submit to form action URL (http://www.example.com/mail.php)

HTML

<form id="contact_form" action="http://www.example.com/mail.php" method="post" novalidate="novalidate" data-track="formSubmit" name="contact_form">

 <!------Form Elements ------->
<input class="form-control submit" type="submit" value="Submit">
</form>

JavaScript

$("form").on("submit", function(event) {
        event.preventDefault();
        $.ajax({
            url: "http://www.mywebsite.com/insertdata.php",
            type: "post",
            crossDomain: true,
            data: $(this).serialize(),
            success: function(responce) {
                console.log(responce);
                return true;
            }
        });
    });

remove event.preventDefault();
If this method is called, the default action of the event will not be triggered.This is stopping the form to submit to the url in action attribute.

$("form").on("submit", function(event) {

              event.preventDefault();
              flag=false;
                $.ajax({
                    url: "http://www.mywebsite.com/insertdata.php",
                    type: "post",
                    crossDomain: true,
                    data: $(this).serialize(),
                    success: function(responce) {
                        console.log(responce);
                        return true;
                        $("form").off("submit");
                        $("form").trigger( "submit" )
                    }
                });      
        });

In success function add a form submit.

$("form").on("submit", function(event) {
    event.preventDefault();
    $.ajax({
        url: "http://www.mywebsite.com/insertdata.php",
        type: "post",
        crossDomain: true,
        data: $(this).serialize(),
        success: function(responce) {
            console.log(responce);
            $("form").submit();
            return true;
        }
    });
});

UPdate: Can you use button click, it will work

$(".submit").on("click", function(event) {

   $("#contact_form").on("submit", function(event) {
        $.ajax({
            url: "http://www.mywebsite.com/insertdata.php",
            type: "post",
            crossDomain: true,
            data: $(this).serialize(),
            success: function(response) {
                console.log(response);
                return true;
            }
        });
    });