There are a lot of possible issues. Try with one of these solutions:
- protocols must be the same (so the page that attempts to access the iframe must have the same protocol of the site that deliver the iframe), so if you are testing your app in sandbox mode (http instead of https), disable the "Secure browsing" mode of your testing account
- channelUrl on
FB.init() (see code below)
- enable the headers mod of apache and put the below lines in your .htaccess
- put the
<div id="fb-root"></div> after the body tag as explained in the fb doc here: https://developers.facebook.com/docs/reference/javascript/
- try to put all the automated login code after a user action (like a click on a login button)
- remove the trailing slash from the Canvas URL (in app→settings) like
http://yoursite.com?
- edit your
<html> tag like this: <html xmlns="http://www.w3.org/1999/xhtml" xmlns:fb="https://www.facebook.com/2008/fbml">
Code for .htaccess
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin "*"
</IfModule>
Code for channels issue:
FB.init({
appId: '1234567890',
status: true,
cookie: true,
xfbml: true,
channelUrl : '//yoursite.com/channel.html'
});
The channel.html delivered by your server should contain this single line:
<script src="//connect.facebook.net/en_US/all.js"></script>
EDIT
About your first issue:
The page at about:blank displayed insecure content from http://static.ak.facebook.com/connect/xd_arbiter.php?version=18#cb=f2e4fe7b…os.com%2Ff4aeadb2&domain=www.mydomain.com&relation=parent&error=unknown_user.
This is an expected exception that is used to test for a condition - this has no side effects so don't care about it.
Please refer to this question: Unsafe JavaScript attempt to access frame with URL: Domains, protocols and ports must match.
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