I have found this very useful Chrome extension called Postman. This is a very useful extension especially when you are into programming RESTful applications.

One thing I am confused on is that how this plugin/extension able to send POST request successfully on different domains?

I tried voting in a poll using Postman like this.

After submitting that, the vote was actually counted in, but when I tried doing that using AJAX and JavaScript, it fails, because of different origin policy of browsers.

How is that even possible?

Here is my code using jQuery. I used that in my computer though, localhost.

init: function() {

    $.ajax({

        url: 'http://example.com/vote.php',

        type:'POST',

        dataType: 'html',

        data: {

            id: '1'

        },

        success: function(data) {

        if ( data == 'voted' ) {

            $('.set-result').html( 'you already voted. try again after 24 hours' );

        } else {

            $('.set-result').html( 'successfully voted' );

        }

    }

    });

},