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X-XSS-Protection Header
<?php
// Raw header
X-XSS-Protection: 1; mode=block
// How to send the response header with PHP
header("X-XSS-Protection: 1; mode=block");
// How to send the response header with Apache (.htaccess)
<IfModule mod_headers.c>
Header set X-XSS-Protection "1; mode=block"
</IfModule>
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