What is the difference between HTTP 1 and 1.1 in the context of PHP headers and browser caching?

When it comes to PHP headers and browser caching, the main difference between HTTP 1 and 1.1 is how caching is handled. In HTTP 1, caching is more simplistic and less efficient compared to HTTP 1.1, which introduced more advanced caching mechanisms like conditional requests and ETags. To ensure better caching control and performance, it is recommended to use HTTP 1.1 headers in your PHP scripts. 

<?php
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");
header("Pragma: no-cache");
?>

Keywords

HTTP 1 HTTP 1.1 PHP headers browser caching difference

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