How to Send an Ajax Request on a Different Port with Jquery

How do I send an AJAX request on a different port with jQuery?

You cannot POST information cross domain, subdomain, or port number. You can however use JSONP if you have access to both the daemon and the requesting site. If data needs to be returned, then the daemon needs to support a callback query parameter and return it properly formatted.

Pass the information to the daemon:

$.getJSON('http://domain.com:8080/url/here?callback=?', {
  key: 'value',
  otherKey: 'otherValue'
}, function(data){
     // Handles the callback when the data returns
});

Now just make sure your daemon handles the callback parameter. For instance, if callback=mycallback the return from the daemon (the only thing written to the page) should look like this:

For an key/value pairs:

mycallback( {'returnkey':'returnvalue', 'other':'data' });

For an array:

mycallback( [1,2,3] );

If you do not have a JSONP or similar mechanism in place, you cannot communicate cross domain using jQuery.

jQuery Ajax on Different Port

Implementing a JSONP service is really simple, you need only a callback GET parameter and at the end, print a string containing the equivalent to a function call with the JSON data as the argument:

$callback = $_GET["callback"];
$user = $_GET["username"];

if($user == "lazy") {
  $response = array("message" => "SUCESS");
} else {
  $response = array("message" => "FAIL");
}

echo $callback . "(". json_encode($response) . ");";

Then you can use it with jQuery $.getJSON:

$.getJSON("jsonpTest.php?callback=?", { username: "lazy"}, function(json){
  alert("JSON Data: " + json.message); // SUCCESS
});

Is it possible to specify a port in a ajax call

It doesn't work due the Same origin policy. AJAX requests are allowed only in the same domain, protocol and port.

If you really need to get data from that source, you should look forward to JSONP.

Ajax cross domain on same machine but different port

Two or more documents can be considered in same domain origin, if they have on
- Same Host
- Same Port
- Same Protocol.
In your case port is different so you can not put ajax query directly. Instead you need to specify following header in response.

 Access-Control-Allow-Origin: mycompany.com

For more info, check this

Cross Domain Ajax, same server but different port?

You can make SOLR accept JSONP requests, according to http://xplus3.net/2010/09/21/solr-and-jsonp/