troubleshooting help jquery/ajax/json no http response

Question

I have a website uploaded into apache tomcat. The code is shown below this website suppose to retrieve json data from other server. For some reason the other server is not responding as I'm getting the error message "handshake didn't go through" . Firebug net panel shows no response header also the apache and the other server are on the same domain. Can you please provide a feedback or clue on how to troubleshoot this? Is there anything with ajax cause it seems it is not sending.

Java script code:

$(document).ready( function(){
    var home_add='http://mywebsite.net:3300/gateway';
    $('#handshake').click(function(){
        alert(" sending json data");
        $.ajax({ /* start ajax function to send data */ 
                url:home_add,
                type:'POST',
                datatype:'json',
                contenttype:'text/json',
                error:function(){ alert("handshake didn't go through")}, 
                /* call disconnect function */
                data:{
                    "supportedConnectionTypes": "long-polling",
                    "channel": "/meta/handshake",
                    "version": "1:0"
                },
                success:function(data){
                    $("p").append(data+"<br/>");
                    alert("sucessful handshake");
                }                    
        })   
    })
});

Firebug time line shows DNS lookup, connecting and waiting there is no sending nor receiving. The request header is the following but there is no response.

Hostmywebsite.net:3300
User-AgentMozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.13) Gecko/20101209 CentOS/3.6-2.el5.centos Firefox/3.6.13 Accepttext/html,application/xhtml+xml,application/xml;q=0.9, / ;q=0.8
Accept-Languageen-us,en;q=0.5
Accept-Encodinggzip,deflate
Accept-CharsetISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive115
Connectionkeep-alive
Originhttp://127.0.0.1:8080
Access-Control-Request-Me...POST

Answer 1

您是否要对除您域以外的域进行ajax调用（即，页面来自mydomain.com，但ajax调用是针对他们的domain.com？）如果是这样，则直接json不允许这样做，但是您可以查看jsonp（带有填充的json）