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I have been researching some strategies to optimize a web application I am working on particularly related to web browser caching and dynamic data. Since potentially the same dynamic content may be loaded multiple times in a session, I came up with the following method using PHP's output buffer and using a hash of the content as an ETag. I realize that the only thing I really save with this method is the transfer of data back to the user since the PHP script still has to completely run, but I was curious if anyone has done something similar and if there are any thoughts or concerns I should be aware of or what other methods may be better. Here is the code I am including at the top of each page: <?php function hash_buffer($content) { $buffer_hash = crc32($content); if ($_SERVER['HTTP_IF_NONE_MATCH'] == $buffer_hash) { header('HTTP/1.1 304 Not Modified'); header("ETag: $buffer_hash"); return ''; } header('Cache-Control: private, no-cache'); header("ETag: $buffer_hash"); return $content; } ob_start('hash_buffer'); ?>