Especificar caché de navegador

Esto es igual a tu otro tema que respondí. Prueba instalar W3 Total Cache, con el tienes varias opciones para lograr lo que quieres.

De cualquier forma te comento tanto para tu otro tema como este. No lo vas a lograr así de fácil, con todo funcionando y rapido.

Es un trabajo muy complicado y de mucho tiempo en el que hay que revisar tu sitio entero.

Saludos.

yo tengo esto en mi htaccess y funciona bien Excepto los elementos externos como google analiticts.js, etc.

AddDefaultCharset utf-8
AddCharset utf-8 .html
AddCharset utf-8 .js
AddCharset utf-8 .css

<IfModule mod_headers.c>
<FilesMatch «.(js|css|xml|gz|html)$»>
Header append Vary: Accept-Encoding
</FilesMatch>
</IfModule>

# BEGIN GZIP
<ifmodule mod_deflate.c>
AddOutputFilterByType DEFLATE image/svg+xml text/text text/html text/plain text/xml text/css application/x-javascript application/javascript
<filesMatch «\.(css|js|x?html?|php)$»>
SetOutputFilter DEFLATE
</filesMatch>
</ifmodule>
# END Compress text files

<ifmodule mod_expires.c>
ExpiresActive On
ExpiresDefault A3600
<filesmatch «\.(jpg|JPG|gif|GIF|png|css|ico|js|webp)$»>
ExpiresDefault «access plus 7 day»
</filesmatch>
</ifmodule>

<IfModule mod_deflate.c>
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE text/javascript
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript
AddOutputFilterByType DEFLATE image/jpeg
</ifModule>

# BEGIN EXPIRES
<IfModule mod_expires.c>
ExpiresActive On
ExpiresDefault «access plus 10 days»
ExpiresByType text/css «access plus 1 week»
ExpiresByType text/plain «access plus 1 month»
ExpiresByType image/gif «access plus 1 month»
ExpiresByType image/png «access plus 1 month»
ExpiresByType image/jpeg «access plus 1 month»
ExpiresByType application/x-javascript «access plus 1 month»
ExpiresByType application/javascript «access plus 1 week»
ExpiresByType application/x-icon «access plus 1 year»
</IfModule>
# END EXPIRES

# BEGIN Cache-Control Headers
<IfModule mod_headers.c>
SetOutputFilter DEFLATE
Header unset ETag
FileETag None
<FilesMatch «\.(js|css|ico|pdf|jpg|jpeg|png|gif)$»>
Header set Cache-Control «public»
Header set Expires «access plus 7 day»
Header unset Last-Modified
</FilesMatch>
</IfModule>

<IfModule mod_headers.c>
<FilesMatch «\.(js|css|xml|gz|webp|ico)$»>
Header append Vary Accept-Encoding
</FilesMatch>

<FilesMatch «\.(ico|pdf|flv|jpg|jpeg|txt|css|webp)$»>
Header set Cache-Control «max-age=2592000, public»
</FilesMatch>

<FilesMatch «\.(ico|jpe?g|png|gif|swf)$»>
Header set Cache-Control «public»
</FilesMatch>
<FilesMatch «\.(css)$»>
Header set Cache-Control «max-age=604800, public, must-revalidate»
</FilesMatch>
<FilesMatch «\.(js)$»>
Header set Cache-Control «max-age=604800, private, must-revalidate»
</FilesMatch>
<FilesMatch «\.(x?html?|php)$»>
Header set Cache-Control «private, must-revalidate»
</FilesMatch>
</IfModule>
# END Cache-Control Headers

# BEGIN W3TC Browser Cache
<IfModule mod_deflate.c>
<IfModule mod_headers.c>
Header append Vary User-Agent env=!dont-vary
</IfModule>
AddOutputFilterByType DEFLATE text/css text/x-component application/x-javascript application/javascript text/javascript text/x-js text/html text/richtext image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon application/json
<IfModule mod_mime.c>
# DEFLATE by extension
AddOutputFilter DEFLATE js css htm html xml
</IfModule>
</IfModule>
# END W3TC Browser Cache
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ – [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress