Your value for `channelUrl` is nominally correct. If I set up my XAMPP server, via `httpd.conf` to use port 8000, then this HTML page works perfectly fine for me:
<!DOCTYPE html>
<html><head>
<title>StackApps SDK auth test</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head><body>
<p>See the console.</p>
<script type='text/javascript' src='https://api.stackexchange.com/js/2.0/all.js'></script>
<script type="text/javascript">
SE.init ( {
clientId: 1543,
key: '{USE YOUR OWN KEY}',
channelUrl: 'http://localhost:8000/test/blank.htm',
complete: function (data) { console.log ("Init: ", data); }
} );
</script>
</body></html>
-- where `blank.htm` is a completely empty file and I access the page with this URL: `http://localhost:8000/test/StckApps_SDK_auth_test.htm`
The console shows:
Init: Object { version="11633"}
So, something you are not showing us is the problem. (Redirects? Using `file://` protocol? Typos? Other?)
----------
However, there is an apparent bug in the SDK. It apparently **does not account for ports when you try to do the next step (`SE.authenticate()`).**
Consider this page:
<!DOCTYPE html>
<html><head>
<title>StackApps SDK auth test</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head><body>
<p>See the console.</p>
<p><button id="authBtn">Get authorized.</button></p>
<script type='text/javascript' src='https://api.stackexchange.com/js/2.0/all.js'></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready (jQueryMain);
function jQueryMain () {
$("#authBtn").click ( function () {
SE.authenticate ( {
success: function (data) { console.log ("Auth success: ", data); },
error: function (data) { console.log ("Auth error: ", data); },
scope: ['read_inbox'],
networkUsers: true
} );
} );
}
</script>
<script type="text/javascript">
SE.init ( {
clientId: 1543,
key: '{USE YOUR OWN KEY}',
channelUrl: 'http://localhost:8000/test/blank.htm',
complete: function (data) { console.log ("Init: ", data); }
} );
</script>
</body></html>
When I click on the <kbd>Get authorized.</kbd> button, a popup appears with a valid access token in the URL. But this information never gets back to the calling page!
The Firefox Error Console reports:
> Security Error: Content at `http://localhost/` may not load data from `http://localhost:8000/test/StckApps_SDK_auth_test.htm`.
Note the port mismatch in what the SDK tries to use? **This looks like a bug.**
If I change the page, edit my [app settings][1], and reset XAMPP to use `localhost` without any port specified (except 80 in httpd.conf), then the page works perfectly and I get a response like:
> Auth success: Object { accessToken="72L6...2W6cH(kQ))", expirationDate=Date, networkUsers=[23]}
in the Firebug console.
----------
So, even if you get the first part working, you do not want to use a non-default port with the SDK, anyway, until the SDK bug is fixed.
[1]: http://stackapps.com/apps/oauth/