Basically what was going on was I was setting the 3600 Cache-Control header in httpd.conf, and wp-super-cache was setting the max-age=3 Cache-Control header in .htaccess.. for whatever reason they weren't merging correctly. It took me quite a while to fix it. Thanks!

Basically what was going on was I was setting the 3600 Cache-Control header in httpd.conf, and wp-super-cache was setting the max-age=3 Cache-Control header in .htaccess.. for whatever reason they weren't merging correctly. It took me quite a while to fix it. Thanks!

HTTP/1.1 200 OK
Date: Tue, 14 May 2013 20:56:32 GMT
Server: Apache
Vary: Accept-Encoding,Cookie
Cache-Control: max-age=3, must-revalidate
Content-Encoding: gzip
Node: 198.101.159.98, unknown
Content-Length: 29197
X-UA-Compatible: IE=Edge,chrome=1
X-Frame-Options: SAMEORIGIN
Cache-Control: max-age=3600, must-revalidate, proxy-revalidate
Keep-Alive: timeout=4, max=46
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8
Content-Language: en

HTTP/1.1 200 OK
Date: Tue, 14 May 2013 20:56:32 GMT
Server: Apache
Vary: Accept-Encoding,Cookie
Cache-Control: max-age=3, must-revalidate
Content-Encoding: gzip
Node: 198.101.159.98, unknown
Content-Length: 29197
X-UA-Compatible: IE=Edge,chrome=1
X-Frame-Options: SAMEORIGIN
Cache-Control: max-age=3600, must-revalidate, proxy-revalidate
Keep-Alive: timeout=4, max=46
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8
Content-Language: en

What do you think about:

Header add Cache-Control "max-age=7200"

# 1 YEAR
Header set Cache-Control "public"
Header set Expires "Thu, 15 Apr 2010 20:00:00 GMT"
Header unset Last-Modified

Vs

ExpiresActive On
ExpiresDefault "access plus 10 years"
ExpiresByType text/html "access plus 1 day"

Header set Cache-Control "public"
Header set Expires "Thu, 31 Dec 2013 20:00:00 GMT"
Header unset Last-Modified

Mine is an Elgg installation. Can you suggest some better optimizations for the elgg htaccess?

# Elgg htaccess directives
# Copyright Curverider Ltd 2008-2009
# License http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
# Link http://elgg.org/
 
<Files "htaccess_dist">
  order allow,deny
  deny from all
</Files>
 
# Don't listing directory
Options -Indexes
 
# Follow symbolic links
Options +FollowSymLinks
 
# Default handler
DirectoryIndex index.php
 
# Turn on expiry
<IfModule mod_expires.c>
  ExpiresActive On
  ExpiresDefault "access plus 10 years"
</IfModule>
 
# php 5, apache 1 and 2
<IfModule mod_php5.c>
  # limit the maximum memory consumed by the php script to 64 MB
  php_value memory_limit 64M
  # register_globals is deprecated as of PHP 5.3.0 - disable it for security reasons.
  php_value register_globals 0
  # post_max_size is the maximum size of ALL the data that is POST'ed to php at a time (8 MB)
  php_value post_max_size 8388608
  # upload_max_filesize is the maximum size of a single uploaded file (5 MB)
  php_value upload_max_filesize 5242880
  # on development servers, set to 1 to display errors. Set to 0 on production servers.
  php_value display_errors 0
</IfModule>
 
# Turn on mod_gzip if available
<IfModule mod_gzip.c>
  mod_gzip_on yes
  mod_gzip_dechunk yes
  mod_gzip_keep_workfiles No
  mod_gzip_minimum_file_size 1000
  mod_gzip_maximum_file_size 1000000
  mod_gzip_maximum_inmem_size 1000000
  mod_gzip_item_include mime ^text/.*
  mod_gzip_item_include mime ^application/javascript$
  mod_gzip_item_include mime ^application/x-javascript$
  # Exclude old browsers and images since IE has trouble with this
  mod_gzip_item_exclude reqheader "User-Agent: .*Mozilla/4..*["
  mod_gzip_item_exclude mime ^image/.*
</IfModule>
 
## Apache2 deflate support if available
##
## Important note: mod_headers is required for correct functioning across proxies.
##
<IfModule mod_deflate.c>
  AddOutputFilterByType DEFLATE text/html text/plain text/xml text/css text/javascript application/javascript application/x-javascript
  BrowserMatch ^Mozilla/4 gzip-only-text/html
  BrowserMatch ^Mozilla/4.[0678] no-gzip
  BrowserMatch bMSIE !no-gzip
 
<IfModule mod_headers.c>
  Header append Vary User-Agent env=!dont-vary
</IfModule>
 
  # The following is to disable compression for actions. The reason being is that these
  # may offer direct downloads which (since the initial request comes in as text/html and headers
  # get changed in the script) get double compressed and become unusable when downloaded by IE.
  SetEnvIfNoCase Request_URI action/* no-gzip dont-vary
  SetEnvIfNoCase Request_URI actions/* no-gzip dont-vary
 
</IfModule>
 
# Configure ETags
<FilesMatch ".(jpg|jpeg|gif|png|mp3|flv|mov|avi|3pg|html|htm|swf|js|ico)$">
  FileETag MTime Size
</FilesMatch>
 
#  Add Proper MIME-Type for Favicon to allow expires to work
AddType image/vnd.microsoft.icon .ico
 
<IfModule mod_rewrite.c>
 
RewriteEngine on
 
# If Elgg is in a subdirectory on your site, you might need to add a RewriteBase line
# containing the path from your site root to elgg's root. e.g. If your site is
# http://example.com/ and Elgg is in http://example.com/sites/elgg/, you might need
#
#RewriteBase /sites/elgg/
#
# here, only without the # in front.
#
# If you're not running Elgg in a subdirectory on your site, but still getting lots
# of 404 errors beyond the front page, you could instead try:
#
#RewriteBase /
 
# In for backwards compatibility
RewriteRule ^pg/([A-Za-z0-9_-]+)$ engine/handlers/page_handler.php?handler=$1&%{QUERY_STRING}
RewriteRule ^pg/([A-Za-z0-9_-]+)/(.*)$ engine/handlers/page_handler.php?handler=$1&page=$2&%{QUERY_STRING}
RewriteRule ^tag/(.+)/?$ engine/handlers/page_handler.php?handler=search&page=$1
 
RewriteRule ^action/([A-Za-z0-9_-/]+)$ engine/handlers/action_handler.php?action=$1&%{QUERY_STRING}
 
RewriteRule ^cache/(.*)$ engine/handlers/cache_handler.php?request=$1&%{QUERY_STRING}
 
RewriteRule ^services/api/([A-Za-z0-9_-]+)/(.*)$ engine/handlers/service_handler.php?handler=$1&request=$2&%{QUERY_STRING}
 
RewriteRule ^export/([A-Za-z]+)/([0-9]+)/?$ engine/handlers/export_handler.php?view=$1&guid=$2
RewriteRule ^export/([A-Za-z]+)/([0-9]+)/([A-Za-z]+)/([A-Za-z0-9_]+)/$ engine/handlers/export_handler.php?view=$1&guid=$2&type=$3&idname=$4
 
# rule for rewrite module test during install - can be removed after installation
RewriteRule ^rewrite.php$ install.php
 
# Everything else that isn't a file gets routed through the page handler
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([A-Za-z0-9_-.]+)$ engine/handlers/page_handler.php?handler=$1 [QSA]
 
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([A-Za-z0-9_-]+)/(.*)$ engine/handlers/page_handler.php?handler=$1&page=$2 [QSA]
 
</IfModule>