How can headers be optimized when working with PHP and XHTML?

Headers can be optimized when working with PHP and XHTML by using the header() function to set appropriate headers before any output is sent to the browser. This ensures that headers are set correctly and can help improve performance and prevent errors. 

<?php
header("Content-Type: text/html; charset=utf-8");
header("X-UA-Compatible: IE=edge");
header("Cache-Control: no-cache, no-store, must-revalidate");
header("Pragma: no-cache");
header("Expires: 0");
?>

Keywords

HTTP headers optimization PHP XHTML caching

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