Facebook iOS Mobile Web JS SDK Error

Question

We already have Facebook working on our main desktop app without an issue. When I added the same setup code to our mobile site I received an error from the JavaScript SDK:

Answer 1

With all due respect, I believe that bokonic's answer is missing the point. The immediate reason of the message you're receiving is most likely javascript postMessage method. It is used to communicate your website with an object returned by window.open or an iframe's embedded website.

window.parent.postMessage(message, targetOrigin);

You might want to have a look at this article to see how it works.

According to MDN reference first argument of the postMessage method can be of any type. Still, Prior to Gecko 6.0 (Firefox 6.0 / Thunderbird 6.0 / SeaMonkey 2.3), the message parameter must be a string.

I tested the method on Chrome 28.0.1500.72 (latest version when writing this answer) and it works fine when passing an object but still throws the warning message to the console. I believe that facebook feels uncomfortable with passing some rich data as a string so they pass it as an object and simply doesn't care about the warning. Or, since there is a workaround (e.g. JSON.stringify), they have a bug they don't know about.

Answer 2

I had the same error. This isn't necessarily the reason you're getting it, but I ended up looking at the packets being received by my iphone simulator, and here's the error from s-statick.ak:

[truncated] <span>Given URL is not allowed by the Application configuration.: One or more of the given URLs is not allowed by the App&#039;s settings.  It must match the Website URL or Canvas URL, or the domain must be a subdomain of one o

For me, the error is that on my device(s), I'm accessing the site through an ip address (192.168.xx etc) and on local development I have hosts routing localhost to a url that is in my facebook app config... so the IP isn't configured for the app.

Facebook won't let me use an IP address, so it seems like the only option is a test deploy or a DNS server. Hope this helps you out.