<?php
    header("content-type:text/html;charset=utf-8");
    highlight_file(__FILE__);
    if (isset($_GET['url'])) {
        $url = $_GET['url'];
        $url = str_replace('..','',$url);
        $url = str_replace('./','',$url);
         $url = str_replace('conn','',$url);
        $content = file_get_contents($_GET['url']);
        echo $content;
    }
?>
Warning: file_get_contents(http:/127.0.0.1:1234/flag.txt): failed to open stream: No such file or directory in /home/wwwroot/www.nanhack.com/payload/ssrf/submit/ssrf1.php on line 9