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Content Negotiation


Code

<?php
header("Vary: Accept");
if (stristr($_SERVER['HTTP_ACCEPT'], 'application/xhtml+xml') || stristr($_SERVER["HTTP_USER_AGENT"],"W3C_Validator"))
{
  header('Content-type: application/xhtml+xml');
  echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
}
else
{
  header('Content-type: text/html');
}
?>

 

 
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