12. ESI - Edge Side Include
• Moves assembly of the web page from the
web server to the Edge server
• Allows easy caching of web page parts
• Can significantly increase caching rates and
lower origin load
14. Example using ESI
<html>
<esi:include src="http://example.com/user-header.php?u=xyz" />
<esi:include src="http://example.com/left-body.php" />
<esi:include src="http://example.com/user-body.php?u=xyz" />
<esi:include src="http://example.com/footer.php" />
</html>
• This happens on the Edge
• Left-body and footer are cacheable