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POCors XmlHttpRequest and Response
 

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    <h2>Description of Task</h2> <p>I'm creating a program with a client/server architecture. The server is a javascript script running in the users's browser, the client is a application running on the user's local machine. The script posts a GET request to a port on 127.0.0.1; 2000 for example. The client reads the message, does some action, and posts a reply back to the server.</p> <h2>Description of Problem</h2> <p>This type of interaction is considered to be cross-origin resource sharing. I've read the material <a href="https://developer.mozilla.org/en/http_access_control" rel="nofollow">here</a> and written my program to respond to the request using with appropriate cors header messages. Unfortunately I seem to be getting the error message:</p> <p><code>XMLHttpRequest cannot load http://127.0.0.1:2000/?Command=test&amp;Parameters=1234. Origin http://127.0.0.1 is not allowed by Access-Control-Allow-Origin.</code></p> <h2>Full Http Exchange</h2> <pre><code>GET /?Command=test&amp;Parameters=1234 HTTP/1.1 Host: 127.0.0.1:2000 Connection: keep-alive Origin: http://127.0.0.1 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML, like Geco) Chrome/17.0.963.79 Safari/535.11 Accept: */* Referer: http://127.0.0.1/test/main.php Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 HTTP/1.1 200 OK Server: Custom-Gnat-Client-v1.0 Access-Control-Allow-Origin: * Origin: http://127.0.0.1 Content-Length: 12 Keep-Alive: timeout=2, max=100 Connection: Keep-Alive Content-Type: text/plain Success </code></pre> <h2>Relevant Code</h2> <p>In main.js:</p> <pre><code>var Is_IE = window.XDomainRequest ? true : false; var Cross_Domain_xmlhttp = Create_Cross_Domain_Request(); function Create_Cross_Domain_Request(){ var request; if(Is_IE) request = new window.XDomainRequest(); else{ if(window.XMLHttpRequest){ request=new XMLHttpRequest(); } else { request=new ActiveXObject("Microsoft.XMLHTTP"); } } return request; } ... var URL = "http://127.0.0.1:2000/"+"?Command="+Command_String+"&amp;Parameters=" +Parameters; if (Cross_Domain_xmlhttp){ if(Is_IE){ Cross_Domain_xmlhttp.onload=function(){ console.log(Cross_Domain_xmlhttp.responseText); } Cross_Domain_xmlhttp.open("GET", URL, true); Cross_Domain_xmlhttp.send(); } else { Cross_Domain_xmlhttp.open('GET', URL, true); Cross_Domain_xmlhttp.onreadystatechange=function(){ if (Cross_Domain_xmlhttp.readyState==4 &amp;&amp; Cross_Domain_xmlhttp.status==200){ console.log(Cross_Domain_xmlhttp.responseText); } } Cross_Domain_xmlhttp.send(); } } else { alert("The browser does not support XDomainRequest or XmlHttpRequest"); } </code></pre> <p>The client code isn't relevant currently but I will post if requested.</p>
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