Caching and Compressing of dynamically generated javascript

Question

I am using php for generating javascript dynamically based on different conditions. I want browser to be able to cache it for specific amount of time.

I am using the following code for caching, but it doesn't seem to be working.

header("Content-type: text/javascript; charset: UTF-8");
header("Cache-Control: must-revalidate");
$offset = 60 * 60 ;
$ExpStr = gmdate("D, d M Y H:i:s", time() + $offset) . " GMT";
header($ExpStr);

Also, The js file is quite big, ~290 KBs, So I want to send it compressed to the browser to reduce download time. any suggestions?

Salman · Accepted Answer · 2013-01-25 06:51:56Z

3

You forgot the Expires header name, So the line

$ExpStr = gmdate("D, d M Y H:i:s", time() + $offset) . " GMT";

Should be

$ExpStr = "Expires: " . gmdate("D, d M Y H:i:s", time() + $offset) . " GMT";

// output your js file here

And for compressing the output, uncomment ( or add if not exists) the following line in PHP.ini. to deflate or compress the output. Don't forget to restart the server after modifying PHP.ini

output_handler = ob_gzhandler

answered Jan 25, 2013 at 6:51

Salman

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2 Comments

Louis Huppenbauer Over a year ago

And if he hasn't got access to the php.ini he could still use ob_start("ob_gzhandler"); to compress all output.

Faisal Sayed Over a year ago

@louis-h Thanks for another way, though fortunately I have access to the php.ini file.

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