The OS of my server:
Distributor ID: Ubuntu Description: Ubuntu 16.04.2 LTS Release: 16.04 Codename: xenial Apahce version:Apache/2.4.18 (Ubuntu) I'm so sorry that my poor English,I will try my best to describe it clearly.
I've added the cache directives to my configuration files,and enabled following modules:cache,cache_disk,expire,headers.
If the cache was fresh(The expiration time was 10 seconds in my file),chrome got response whit code 200 from local cache.But when the cache was stale,the apache server did not check whether the content is still fresh before serving stale content to client.
Chrome got code 200 again,and never got the code 304.What's wrong with my configuration?There are my configurations:
1. /etc/apache2/apache2.conf
Mutex file:${APACHE_LOCK_DIR} default PidFile ${APACHE_PID_FILE} Timeout 300 ServerName smt.lhc.com KeepAlive On MaxKeepAliveRequests 100 KeepAliveTimeout 5 User ${APACHE_RUN_USER} Group ${APACHE_RUN_GROUP} HostnameLookups Off ErrorLog ${APACHE_LOG_DIR}/error.log LogLevel debug IncludeOptional mods-enabled/*.load IncludeOptional mods-enabled/*.conf Include ports.conf LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %O" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent 2. /etc/apache2/mods-available/cache_disk.conf
<IfModule mod_cache_disk.c> CacheEnable disk / CacheDirLevels 2 CacheDirLength 1 </IfModule> 3. /etc/apache2/sites-available/000-default.conf
<VirtualHost *:80> #ServerName ServerAdmin webmaster@localhost DocumentRoot /var/www/smt-web #DocumentRoot /var/www/html ErrorLog ${APACHE_LOG_DIR}/error.log CustomLog ${APACHE_LOG_DIR}/access.log combined <Directory "/var/www/smt-web"> RewriteEngine on RewriteCond %{REQUEST_FILENAME} -f [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^ - [L] RewriteRule ^ index.html [L] CacheQuickHandler off CacheLock on CacheLockPath /tmp/mod_cache-lock CacheLockMaxAge 5 CacheIgnoreHeaders Set-Cookie <Location /> CacheEnable disk CacheHeader on CacheDefaultExpire 600 CacheMaxExpire 86400 CacheLastModifiedFactor 0.5 ExpiresActive on ExpiresDefault "access plus 10 sceonds" Header merge Cache-Control public FileETag All </Location> </VirtualHost> 1 Answer
Your configuration looks exactly same like the Digital Ocean configuration
You can add %{cache-status}e to the LogFormat line to log the cache status in access.log of Apache.
I am using the same configuration as above, but in my case the cache serves always the same content, don't matter what i click on the homepage.
I am afraid that config does not work for Ubuntu 16.04 and Apache 2.4.18.
