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PONot receiving signed_request in Facebook iframe-app
 

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  1. PONot receiving signed_request in Facebook iframe-app
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    <p>I have created a Page Tab Facebook App where I want to display different content depending on the user being a fan or not. (Also called fan gate, landing page or reveal page)</p> <p>For this I'm using the PHP SDK, in specific the following code:</p> <pre><code>&lt;?php require 'src/facebook.php'; $facebook = new Facebook(array( 'appId' =&gt; 'APP_ID', 'secret' =&gt; 'APP_SECRET', 'cookie' =&gt; true, )); ?&gt; </code></pre> <p>And in the content:</p> <pre><code>&lt;?php $signed_request = $_REQUEST["signed_request"]; list($encoded_sig, $payload) = explode('.', $signed_request, 2); $data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true); if (empty($data["page"]["liked"])) {?&gt; Thank you for liking our Page! &lt;?php } else { ?&gt; You haven't liked our page yet.. &lt;?php }; // Debugging Code echo "REQUEST:&lt;br&gt;"; print_r($_REQUEST); echo "&lt;br&gt;GET:&lt;br&gt;"; print_r($_GET); echo "&lt;br&gt;POST:&lt;br&gt;"; print_r($_POST); ?&gt; </code></pre> <p>This works when I'm logged in with my Facebook User and when I use it on my own Page. Meaning the signed_request is present in both $_POST and $_REQUEST.</p> <p>However, when I test it with another user, there is no signed_request value in those variables..</p> <p>Notes: - I already took a look at my URL Settings in the App Configuration (300 Redirect and stuff) but this looks fine, and like I said with my User it's working.. - the signed_request is not just empty, it doesn't even exist.</p> <p>Does anybody have similar issues?</p> <p>I would not mind using the Javascript SDK instead of PHP if it works then, but I'm not very experienced in Javascript.</p> <p>EDIT:</p> <p>As i found out you always have to have a non-secure (http) and a secure (https) URL. Even if you enter a secure URL as the standard URL, facebook will contact it using http and will then get redirected (depends on server configuration) to the https, which makes you lose your signed_request.</p>
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