Re: [users@httpd] problem when using mod_deflate and zip files and IE6

robert rottermann <robert@xxxxxxxxx> · Fri, 13 May 2005 12:34:50 +0200

Axel-Stéphane SMORGRAV wrote:
thanks for your answer

Does Apache seem to be compressing the file i.e. is Content-Encoding: gzip ? If it is not, which I suspect, mod_deflate did not compress the file. Judging from your configuration, there is no reason to believe that your zip files are treated any differently than pdf files.

What about the deflate log? Does that contain any indication of zip files being compressed whereas pdf files are not?

when I unload mod_deflate everything works fine

Did you try to unload or otherwise de-activate mod_deflate to see if that makes any difference?

as soon as I have mod_deflat logged and
SetOutputFilter DEFLATE
it does not work anymore.

From the deflate log I do not get any usefull info, since no matter 

what the settings are, it does not show any compression ratio

Using
   # deflate.log, log compression ratio on each request
   DeflateFilterNote ratio
   LogFormat '"%r" %b (ratio=%{ratio}n) "%{User-agent}i"' deflate
   CustomLog /var/log/apache2/deflate.log deflate

I only get lines as the following .

"GET /ploneNS4.css HTTP/1.1" 794 (ratio=-) "Mozilla/4.0 (compatible; 

MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50110)"

This is also something that makes me wonder. Why do I not get a 

compression ration

.
Now I achieved serving zip f iles by using
   AddOutputFilterByType DEFLATE text/html text/plain text/css
instead of
   SetOutputFilter DEFLATE

Why is this so??
thanks again for your help
Robert

<IfModule mod_deflate.c>
   DeflateCompressionLevel 9

   # NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48

   # the above regex won't work. You can use the following
   # workaround to get the desired effect:
   #BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html

   # Don't compress images, java scripts and style sheets

   #_robert_ pdf, gz hinzugeuegt
   SetEnvIfNoCase Request_URI \
   \.(?:gif|jpe?g|png|js|css|pdf|gz|zip)$ no-gzip dont-vary

   # Make sure proxies don't deliver the wrong content

   # this needs mod_headers but it's very important
   # so I don't add a IfModule around it
   #Header append Vary User-Agent env=!dont-vary

   <Location />
       # compress content with type html, text, and css
       AddOutputFilterByType DEFLATE text/html text/plain text/css
       <IfModule mod_headers.c>
           # properly handle requests coming from behind proxies
           Header append Vary User-Agent env=!dont-vary
       </IfModule>
   </Location>

   # deflate.log, log compression ratio on each request
   DeflateFilterNote ratio
   LogFormat '"%r" %b (ratio=%{ratio}n) "%{User-agent}i"' deflate
   CustomLog /var/log/apache2/deflate.log deflate

   #Properly handle old browsers that do not support compression
   BrowserMatch ^Mozilla/4 gzip-only-text/html
   BrowserMatch ^Mozilla/4\.0[678] no-gzip
   BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
</IfModule>

-ascs

-----Original Message-----

From: robert rottermann [mailto:robert@xxxxxxxxx] 

Sent: Thursday, May 12, 2005 2:42 PM

To: users@xxxxxxxxxxxxxxxx
Subject: [users@httpd] problem when using mod_deflate and zip files and IE6

Hi there,

When I use the following combination:

Apache 2.049
Linux (SuSe 9.1)
mod_deflate

and a zip file is served to a IE6 client, the file can not be used 

anymore. (I get an error by win zip claiming that it is not a valid zip 

archive)

I tried to suppress that mod_deflate by the following rule. This did 

help with *.pdf files (which had the same problem), but not zip files.

Any help would be greatly appreciated.

Robert

<IfModule mod_deflate.c>
DeflateCompressionLevel 3

DeflateFilterNote Input instream
DeflateFilterNote Output outstream
DeflateFilterNote Ratio ratio

LogFormat '"%r" %{outstream}n/%{instream}n (%{ratio}n%%)' deflate

# Netscape 4.x has some problems...
BrowserMatch ^Mozilla/4 gzip-only-text/html

# Netscape 4.06-4.08 have some more problems
BrowserMatch ^Mozilla/4\.0[678] no-gzip

# MSIE masquerades as Netscape, but it is fine
#BrowserMatch \bMSIE !no-gzip !gzip-only-text/html

# NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48
# the above regex won't work. You can use the following
# workaround to get the desired effect:
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html

# Don't compress images, java scripts and style sheets
#_robert_ pdf, gz hinzugeuegt
SetEnvIfNoCase Request_URI \
  \.(?:gif|jpe?g|png|js|css|pdf|gz|zip)$ no-gzip dont-vary

# Make sure proxies don't deliver the wrong content
# this needs mod_headers but it's very important
# so I don't add a IfModule around it
Header append Vary User-Agent env=!dont-vary

</IfModule>

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