Hi, I have a problem with php header redirect. I already spent hours trying to fix it. The problem doesn't occur when the bit.ly api is not used in the script, I have no clue why.

<?php
    if (strlen($_GET['url']) > 26) {
        $shortenedURL = $_GET['url'];
        if (isset($_GET['login']) && isset($_GET['apikey'])) {
            $shortenedURL = file_get_contents('http://api.bit.ly/v3/shorten?format=txt&login='.urlencode($_GET['login']).'&apiKey='.$_GET['apikey'].'&uri='.urlencode($_GET['url']));
        }
        else {
            $shortenedURL = file_get_contents('http://icbrd.net/shorten.php?longurl='.$_GET['url']);
        }

        if (strlen($shortenedURL) > 0) {
            header( 'Location: icebird://compose?status='.$shortenedURL.'%20' );
            exit();
        }
        else {
            header( 'Location: icebird://compose?status='.$_GET['url'].'%20' );
            exit();
        }
    }
    else {
        header( 'Location: icebird://compose?status='.$_GET['url'].'%20' );
        exit();
    }
?>

I hope you can help me, as this is driving me crazy. Regards