fb：iframe 中的请求表单重定向远离 Facebook
我在 iFrame Facebook 应用程序中有一个
<script type="text/javascript">
top.location.href = "http://www.facebook.com/login.php?api_key=***&v=1.0&req_perms=&next=http%3A%2F%2F***";
</script>
在发送 jQuery AJAX 请求以更新 iFrame 中的各种元素时，我已经遇到了同样的问题。我通过确保我的标头包含 P3P: CP="CAO PSA OUR" 解决了该问题。这确实是为这个调用设置的（可以在 Firebug 中清楚地看到），但我仍然被重定向到 facebook.com/login.php。
I have an <fb:requestform> in an iFrame Facebook app. I have set target="_parent", so that the callback will target the parent iFrame and not itself, which seems to work as expected. But, instead of my desired file loading, I get redirected to my server. Checking the response of the requestform's POST in Firebug revealed this:
<script type="text/javascript">
top.location.href = "http://www.facebook.com/login.php?api_key=***&v=1.0&req_perms=&next=http%3A%2F%2F***";
</script>
I have already had this same problem when sending jQuery AJAX requests to update various elements in an iFrame. I solved the problem by making sure my headers contain P3P: CP="CAO PSA OUR". That is indeed set for this call as well (can be seen clearly in Firebug), but I still get redirected to facebook.com/login.php.
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我最终只是解决这个问题而不是解决它。我没有在大多数页面上使用 require_login() ，而是将用户的 Facebook ID 及其会话密钥存储在会话变量中，并在后续页面调用中使用它们“重新实例化”用户（使用 $facebook->set_user()）。
I eventually ended up working around this problem rather than solving it. Instead of using require_login() on most of my pages, I store the user's Facebook ID and their session key in session variables and use those to "reinstantiate" the user (using $facebook->set_user()) on subsequent page calls.