Question

PHP GZIP compression not working on Firefox, how come?

Asked by: iamnatio

Hello,

On one of my sites I am using PHP GZIP compression. For more users using Firefox or IE it works fine, however there is a select few where it does not work. Why is that? They are using the latest version of Firefox however it still does not work for them. Is there a setting they can maybe enable? Or is it because they are behind a firewall?

Any help would be appreciated. I have also attached the GZIP code I am using.

function doGzip($content, $sHeader, $iLevel = 9)
{	
	$expiresOffset = 3600 * 24 * 10;
	$supportsGzip = false;
 
	header("Content-type: text/" . $sHeader);
	header("Vary: Accept-Encoding");  
	header("Expires: " . gmdate("D, d M Y H:i:s", time() + $expiresOffset) . " GMT");
 
	if (isset($_SERVER['HTTP_ACCEPT_ENCODING']))
	{
		$encodings = explode(',', strtolower(preg_replace("/\s+/", "", $_SERVER['HTTP_ACCEPT_ENCODING'])));
	}
 
	if ((in_array('gzip', $encodings) || in_array('x-gzip', $encodings) || isset($_SERVER['---------------'])) && function_exists('ob_gzhandler') && !ini_get('zlib.output_compression')) 
	{
		$enc = in_array('x-gzip', $encodings) ? "x-gzip" : "gzip";
		$supportsGzip = true;
	}
 
	if ($supportsGzip)
	{
		$content = gzencode($content, $iLevel, FORCE_GZIP);	
		header("Content-Encoding: " . $enc);
	}
 
	echo $content;
	exit;
}

                                  
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Asked On
2007-12-11 at 12:24:34ID23016685
Tags

gzip

,

firefox

,

compression

,

php

Topics

Firefox Web Browser

,

Internet Explorer Web Browser

,

PHP Scripting Language

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: ravenplPosted on 2007-12-11 at 12:30:45ID: 20452437

Maybe they use proxy, and the proxy don't want to accept compressed output?

 

by: poisaPosted on 2007-12-17 at 20:55:53ID: 20490078

Ravenpl might be right.

I also found that certain Kaspersky Internet Security 7 settings will break compressed sites.

Just a test: if you use this code (see snippet) right at the beginning of the page, you should get the same results (or pretty much the same) as with your code. You shouldn't have to worry about the user accepting encoded content as the user agent will do that automatically and always accept the correct version.


<?php
ob_start("ob_gzhandler");
?>

                                              
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by: ravenplPosted on 2008-02-16 at 23:26:37ID: 20913285

And what was the solution?
Using ob_start() instead of Your code fixed it?

20120131-EE-VQP-002

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