PHP Vs JQuery Web api2

Well, the title is really bad here, but i had no other way to explain what is happing my server.

I have a normal web api2, new. i installed cross domain and only putted

config.EnableCors(); on webapiconfig.

I have a MailController Which contains this method :

 [HttpPost]//omUrl/{url?}
        [Route(@"~/api/Mail/MailOpen")]
        public void MailOpen()
        {
            try
            {
                File.Create(@"D:\Emails\Alive.html");

            }
            catch (Exception ex)
            {
                // ignored
            }
        }

and run on a web with this host: http://localhost:56212/

So, i am trying to post some data to check cross domain policy and i post with this php code :

<?php 
$url = 'http://localhost:56212/api/Mail/MailOpen';
$data = array('Smtp' => 'value1', 'Subject' => 'value2');

// use key 'http' even if you send the request to https://...
$options = array(
    'http' => array(
        'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
        'method'  => 'POST',
        'content' => http_build_query($data),
    ),
);
$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context);

var_dump($result);
 ?>

This code gets to the server and the Alive.html is created, Wait. How can that be i asked my self, i don't have any cross domain policy yet on this controller ?..

So i tryed to run this javascript code :

<script>

 $.get(
     "http://localhost:56212/api/Mail/MailOpen",
     { 'G': "aa94a7cf-7794-41ff-b8d0-fcfe34fcb19c" }, // put your parameters here
     function (responseText) {
           console.log(responseText);

     }

    );
</script>

Which suppose to do the same thing.. but i get this error :

jquery-1.11.2.min.js:4 GET http://localhost:56212/api/Mail/MailOpen?G=aa94a7cf-7794-41ff-b8d0-fcfe34fcb19c m.ajaxTransport.send @ jquery-1.11.2.min.js:4m.extend.ajax @ jquery-1.11.2.min.js:4m.each.m.(anonymous function) @ jquery-1.11.2.min.js:4m.extend.getJSON @ jquery-1.11.2.min.js:4(anonymous function) @ index.html:6
index.html:1 XMLHttpRequest cannot load http://localhost:56212/api/Mail/MailOpen?G=aa94a7cf-7794-41ff-b8d0-fcfe34fcb19c. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access. The response had HTTP status code 405.

Which is normal, because i don't have any policy yet.

Can any one tell me why the php worked and the jQuery return an error?

Ty all.