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XMLHttpRequest returns Access-Control-Allow-Origin

Posted on 2014-11-19
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Last Modified: 2014-11-19
Hi All,

I have the following code;

<script src="https://code.jquery.com/jquery-1.10.2.js"></script>

<table class="mGrid" id="jsondata">
<thead>
<th>ID</th>
<th>Customer</th>
<th>Contact</th>
</thead>
<tbody></tbody>
</table>
</div>

<script type="text/javascript">

$(document).ready(function(){
	var url="https://www.mywebsite.com/getjson.php";
	$("#jsondata tbody").html("");
	$.getJSON(url, function(data){
				format: "jsonp"
				$.each(data.users, function(i,user){
					var newRow = "<tr>"+"<td>-</td>"+"<td>"+user._9+"</td>"+"<td>"+user.Con_ConName+"</td>"+"</tr>" ;
					$(newRow).appendTo("#jsondata tbody");
				});
	});
});

</script>

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That uses getJSON to grab some data from the server.  This works well on the local server.  However I need to run it via a different URL.  When I do this I get the following error

XMLHttpRequest cannot load https://www.mywebsite.com/getjson.php. 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 401.


A lot of people on the internet highlight is a cross site security issue.

I have full control over everything, so can make changes to the server (IIS7)


Any suggestions?
0
Comment
Question by:detox1978
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4 Comments
 
LVL 19

Accepted Solution

by:
Greg Alexander earned 2000 total points
ID: 40452529
On your remote file you can add a php header:

<?php
header('Access-Control-Allow-Origin: https://www.mywebsite.com');
?>

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0
 
LVL 2

Author Comment

by:detox1978
ID: 40452564
The connecting page is actually embedded in an HTML5 Blackberry application.

is there a way to tell what the URL it uses?  maybe via a PHP page on the server it could connect to.

Alternatively, is there a way to switch it off/allow everyone
0
 
LVL 2

Author Comment

by:detox1978
ID: 40452650
After a little digging around I found an article that said to enable that setting on IIS I need to add the following to my web.config file;

<?xml version="1.0" encoding="utf-8"?>
<configuration>
 <system.webServer>
   <httpProtocol>
     <customHeaders>
       <add name="Access-Control-Allow-Origin" value="*" />
     </customHeaders>
   </httpProtocol>
 </system.webServer>
</configuration>

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I now see the following error message in the console log

GET https://www.mywebsite.com/getjson.php. 401 (Unauthorized) 

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followed by

XHR finished loading: GET "https://www.mywebsite.com/getjson.php". 

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0
 
LVL 2

Author Closing Comment

by:detox1978
ID: 40452759
The web.config change I mentioned fixed the issue.  The second 401 was because the web server didnt have anonamous access enabled.

many thanks
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