facebook apprequest redirecting to domain - PHP SDK -

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this first app in fb. i'm developing game in facebook. i'm using php-sdk invite friends app.

i able send requests , ids well, when when click on send request. i'm getting redirected domain. 

<a href="invite.php">invite</a>

this invite.php code

<?php include("config.php"); $reqid = $_get['request']; $to = $_get['to'];  if($reqid==''){     $message = "check great app?";     $url = canvas_url."invite.php";     $requests_url = "http://www.facebook.com/dialog/apprequests?app_id=".app_id."&redirect_uri=".urlencode($url)."&message=".$message;     echo("<script> top.location.href='" . $requests_url . "'</script>"); }else{     echo "invite done!";     echo "invited ".count($to);     exit; } ?>

i invite done! invited

why redirecting domain ??

when go through http://apps.facebook.com/app-name, still able view content in iframe within facebook facebook friends list facebook, after send requests friends i'm redirected canval_url given http://domain-name.com

thanks help.

don't know if correct solution, worked me :

after user login redirected domain.com instead of facebook/myapp so...i redirected again javascript :)

in html file:

<head>  <script>    if(window.location.href != 'http://domain.com/game/')    window.location.href='https://apps.facebook.com/appname/';         </script> </head>

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