Access-Control-Allow-Origin not working for iframe within the same domain

javascript iframe cross-domain-policy

69,802

Access-Control-Allow-Origin is used only for XHR.

What you need is called Same Origin Policy.

You have to add document.domain = 'example.com' to your pages.

69,802

Author by

Edi

Updated on August 03, 2022

Comments

Edi almost 2 years

I'm trying to access an iframe within a subdomain and get a cross domain error.

Here is the code of example.mydomain.com/iframe_test.html:

<html>
<head>
     <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
</head>
<body>
    <iframe src="http://example2.mydomain.com/welcome.php" width="1000" height="600"></iframe>
    <script>
        $(document).ready(function()
        {
            setTimeout(function(){
                $('#innerdiv',$('iframe').contents()).hide();
            },5000);
        });
    </script>
</body>
</html>

And here is the code of example2.mydomain.com/welcome.php:

<?php
header("Access-Control-Allow-Origin: " . "*");
?>
<html>
<head>

</head>
<body>
    <div id="innerdiv">
        hello
    </div>
</body>
</html>

When the line $('#innerdiv',$('iframe').contents()).hide() is executed, the following error occurs:

Uncaught SecurityError: Failed to read the 'contentDocument' property from 'HTMLIFrameElement': Blocked a frame with origin "http://example.mydomain.com" from accessing a frame with origin "http://example2.mydomain.com". Protocols, domains, and ports must match.

I checked with Fiddler that the Access-Control-Allow-Origin header was really returned in the response of welcome.php

Is it possible to access the contents of an iframe within a subdomain?

Saeed Neamati over 9 years

Where should we add that document.domain stuff? Can you elaborate a little more. Thank you.
Maksim Luzik over 9 years

@SaeedNeamati You need to add it to both of the pages into script tag. Basically the main page and the iframe page need to have <script>document.domain = 'example.com'</script> set
Mike R about 9 years

This doesn't work, I get: Uncaught SecurityError: Failed to set the 'domain' property on 'Document': 'example.com' is not a suffix of ''.
Alexey Ten about 9 years

@MikeR what address of your document?
Sayuj3 over 7 years

<script>document.domain = 'example.com'</script> where to paste is exactly.? I pasted it but didnt wrk properly.
tarn about 7 years

Must use document.domain = 'localhost'; or your domain You should open in web server, not a local file
skini82 almost 3 years

This solution is deprecated
quadratecode over 2 years

Note on deprecation: developer.mozilla.org/en-US/docs/Web/API/Document/domain