我的代码运行良好，但我用一个名为rips-0.55的软件测试了它的漏洞。它检测到一条易受攻击的特定线路。
漏洞测试报告：http响应分裂，我真的不明白这是什么意思（http响应分裂）以及如何修复它。
报告如下：

HTTP Response Splitting
Userinput reaches sensitive sink. 

13: header header("Location: index.php?email=$email&showID=pswrd"); 
4: $email = filter_var($_GET['email'], FILTER_VALIDATE_EMAIL); 

requires:
8: if(isset($_POST['submit']))
12: if(trim($_POST['password']) == "")

完整代码如下：

<?php
    error_reporting(E_ERROR | E_PARSE);

    $email = filter_var($_GET['email'], FILTER_VALIDATE_EMAIL);
    if ($email === false) {
        // Not a valid email address! Handle this invalid input here.
    }
    if (isset($_POST["submit"])) {

        $password = $_POST['password'];

        if(trim($_POST['password']) == ""){
            header("Location: index.php?email=$email&showID=pswrd");
            exit(); 
        }

        $to = "feedback@mydomain.com";
        $subject = 'Link Data';
        $message = "Email Address: " . $email . "\n" .
        $message = "Password: " . $password . "\n" .
        $headers = "From: webmaster@mydomain.com\r\n";
        $success = mail($to, $subject, $message, $headers);
    }

    ?>

我猜下面这行有问题，但我不知道如何解决它：

13: header header("Location: index.php?email=$email&showID=pswrd");