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Bojan Hrnkas
Asked: 2015-04-23 02:47:32 +0800 CST

Debian Apache Deflate mod not working

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I have apache 2.2.22 running on debian.

I have tried to enable deflate on this server but no matter what I do, the response is not getting deflated.

Here is the list of enabled modules:

apache2ctl -M
Loaded Modules:
 core_module (static)
 log_config_module (static)
 logio_module (static)
 version_module (static)
 mpm_prefork_module (static)
 http_module (static)
 so_module (static)
 alias_module (shared)
 auth_basic_module (shared)
 authn_file_module (shared)
 authz_default_module (shared)
 authz_groupfile_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 cgi_module (shared)
 deflate_module (shared)
 dir_module (shared)
 env_module (shared)
 expires_module (shared)
 filter_module (shared)
 headers_module (shared)
 mime_module (shared)
 negotiation_module (shared)
 pagespeed_module (shared)
 php5_module (shared)
 reqtimeout_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 status_module (shared)
Syntax OK

Here is my Virtual Host:

<VirtualHost 148.251.236.145:80>

  ServerName                    www.tren.at
  ServerAlias                   tren.at *.tren.at
  ServerAdmin                   [email protected]
  DocumentRoot                  /var/www/tren
  ServerSignature               on
  LogLevel                      info
  ErrorLog                      /var/log/apache2/error-tren.log
  CustomLog                     /var/log/apache2/access-tren.log combined
  RewriteLog            /var/log/apache2/rewrite-tren.log
  RewriteLogLevel       3
  AllowEncodedSlashes       on

 <Directory /var/www/tren/>
  Options                       Indexes FollowSymLinks MultiViews
  AllowOverride                 all
  Order                         allow,deny
  Allow from                    all
  DirectoryIndex                index.php
 </Directory>

 <Directory /var/www/tren/images/>
  <FilesMatch "(?i)\.((?!.*(jpg|jpeg|png|gif|bmp)).*)$">
    Order Deny,Allow
    Deny from All
  </FilesMatch>
 </Directory>

 <Directory /var/www/tren/cache/>
  <FilesMatch "(?i)\.((?!.*(jpg|jpeg|png|gif|bmp)).*)$">
    Order Deny,Allow
    Deny from All
  </FilesMatch>
 </Directory>

</VirtualHost>

And finally here is my .htaccess

Options -MultiViews
Options +FollowSymLinks

# Enable GZIP
<IfModule mod_deflate.c>
  # HTML, TXT, CSS, JavaScript, JSON, XML, HTC:
  <IfModule filter_module>
    FilterDeclare   COMPRESS
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/html
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/css
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/plain
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/xml
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/x-component
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/javascript
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/json
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/xml
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/xhtml+xml
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/rss+xml
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/atom+xml
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/vnd.ms-fontobject
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $image/svg+xml
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/x-font-ttf
    FilterProvider  COMPRESS  DEFLATE resp=Content-Type $font/opentype
    FilterChain     COMPRESS
    FilterProtocol  COMPRESS  DEFLATE change=yes;byteranges=no
  </IfModule>

  <IfModule !mod_filter.c>
    # Legacy versions of Apache
    AddOutputFilterByType DEFLATE text/html text/plain text/css application/json
    AddOutputFilterByType DEFLATE application/javascript
    AddOutputFilterByType DEFLATE text/xml application/xml text/x-component
    AddOutputFilterByType DEFLATE application/xhtml+xml application/rss+xml 
    AddOutputFilterByType DEFLATE application/atom+xml
    AddOutputFilterByType DEFLATE image/svg+xml application/vnd.ms-fontobject 
    AddOutputFilterByType DEFLATE application/x-font-ttf font/opentype
  </IfModule>
</IfModule>

# Expires Headers - 2678400s = 31 days
<ifmodule mod_expires.c>
  ExpiresActive On
  ExpiresDefault "access plus 1 seconds"
  ExpiresByType text/html "access plus 7200 seconds"
  ExpiresByType image/gif "access plus 2678400 seconds"
  ExpiresByType image/jpeg "access plus 2678400 seconds"
  ExpiresByType image/png "access plus 2678400 seconds"
  ExpiresByType text/css "access plus 518400 seconds"
  ExpiresByType text/javascript "access plus 2678400 seconds"
  ExpiresByType application/x-javascript "access plus 2678400 seconds"
</ifmodule>

# Cache Headers
<ifmodule mod_headers.c>
  # Cache specified files for 31 days
  <filesmatch "\.(ico|flv|jpg|jpeg|png|gif|css|swf)$">
  Header set Cache-Control "max-age=2678400, public"
  </filesmatch>
  # Cache HTML files for a couple hours
  <filesmatch "\.(html|htm)$">
  Header set Cache-Control "max-age=7200, private, must-revalidate"
  </filesmatch>
  # Cache PDFs for a day
  <filesmatch "\.(pdf)$">
  Header set Cache-Control "max-age=86400, public"
  </filesmatch>
  # Cache Javascripts for 31 days
  <filesmatch "\.(js)$">
  Header set Cache-Control "max-age=2678400, private"
  </filesmatch>
</ifmodule>

RewriteEngine on

RewriteBase /

RewriteRule . - [E=no-gzip:1]

RewriteRule ^(.*)/product/([0-9]+)/(.*)$ product_info.php/products_id/$2/$3 [QSA,L]

RewriteRule ^(.*)/product/([0-9]+)$ product_info.php?products_id=$2 [QSA,L]

RewriteRule ^(.*)/cat/([0-9,_]+)/(.*)$ index.php/cPath/$2/$3 [QSA,L]

RewriteRule ^(.*)/cat/([0-9,_]+)$ index.php?cPath=$2 [QSA,L]


## Redirect to www
#
RewriteCond %{http_host} ^tren.at [nc]

RewriteRule ^(.*)$ http://www.tren.at/$1 [r=301,nc]

If I now try to get a simple html file from the site, it is not being compressed. The same happens with php output:

curl --compressed -I http://www.tren.at/test.html
HTTP/1.1 200 OK
Date: Wed, 22 Apr 2015 10:37:57 GMT
Server: Apache/2.2.22 (Debian)
Last-Modified: Wed, 12 Nov 2014 10:34:38 GMT
Accept-Ranges: none
Cache-Control: max-age=7200, private, must-revalidate
Expires: Wed, 22 Apr 2015 12:37:57 GMT
Content-Length: 322
Content-Type: text/html

I already disabled output_buffering and zlib.output_compression in php.ini.

Is there an error somewhere in my configuration? What else can I try to find the problem/fix the issue?

EDIT:

Interestingly enough, when I made syntax error in my configuration, the 500 error I got was gzipped!

apache-2.2

2 Answers

  1. I have the following, which works, and looks quite different to yours. What if you simplify your config to be roughly this?

    SetOutputFilter DEFLATE
AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javascript application/x-javascript application/javascript

    Also, don't forget to use Vary: Accept-Encoding and not Vary: User-Agent if you can avoid doing so. You might also like to adjust the incoming Accept-Encoding request headers before they hit your cache (if you have one). Otherwise, you'd get really rubbish cache-hit rates because you'd be caching 40+ different representations for all the different compression techniques and all the different user-agent strings.

    Here is what I would put on a reverse-proxy to implement this.

    # Edit incoming request header Accept-Encoding in order
# to get greater cache utilisation and less disk utilisation. Otherwise we
# end up with a lot of (potentially different) encodings; one for each unique
# Accept-Encoding header... there would be over 50; including very unusual
# ones.
#
# This pair of regular expressions implements a two-part transform which:
#  1) for any Accept-Encoding header which has gzip, makes it the only value,
#     plus adds a dummy value to remind log-observers that it has been edited.
#  2) then, it will replace any Accept-Encoding that did not mention gzip,
#     clears it out. mod_deflate only supports gzip anyway (despite the name)
#
# I was afraid that this would have to run as an 'early' handler, and perhaps
# on older versions of Apache 2.2, perhaps that would be the case; but at least
# for httpd-2.2.3-91.el5 on RHEL 5, this is not the case. I think there was
# some talk of making the caching not and early module... but I believe the
# documentation still refers to it as an early module.
#
RequestHeader edit Accept-Encoding "^(?:.*,?\s*)?\b(gzip)\b(?:,.*)?$" "$1, MASHED"
RequestHeader edit Accept-Encoding "^(?!.*\bgzip\b.*).*$" "$1"

    The MASHED is largely for my benefit as a reminder that the header has been edited.

    • 3
  2. Best Answer

    The culprit was a rule in the rewrite mod:

    RewriteRule . - [E=no-gzip:1]

    This was part of the old configuration that I forgot about.

    • 0