Google PageSpeed compressing and .htaccess - .htaccess

Question

I am trying to speed up my website as best as I can. I ran Google's PageSpeed, got 83/100.
Page says to compress resources, such as .js and .css files.
"Compressing resources with gzip or deflate can reduce the number of bytes sent over the network."
Okey, then I googled and edited my .htaccess:
<IfModule mod_deflate.c>
<FilesMatch "\.(css|js|xml)$">
SetOutputFilter DEFLATE
</FilesMatch>
</IfModule>
<IfModule mod_headers.c>
<FilesMatch "\.(js|css|xml|gz)$">
Header append Vary: Accept-Encoding
</FilesMatch>
</IfModule>
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/png A604800
ExpiresByType image/gif A604800
ExpiresByType image/jpg A604800
ExpiresByType image/jpeg A604800
ExpiresByType text/javascript A604800
ExpiresByType application/x-javascript A604800
ExpiresByType text/css A604800
</IfModule>
When I inspect my site:
Headers:
Accept-Encoding gzip, deflate
Cache:
Data Size 332
Device disk
Expires Thu Jan 01 1970 02:00:00
And PHP in my site:
if (substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip'))
ob_start("ob_gzhandler");
else
ob_start();
header('Vary: Accept');
header('Cache-Control: max-age=28800');
Any ideas what is going wrong?

Answer 1

In your sample code above there's no extension specified for html content e.g. .php
I generally manage gzip by mimetype rather than by file extension e.g.
<IfModule mod_filter.c>
AddOutputFilterByType DEFLATE application/atom+xml \
etc
See https://github.com/h5bp/html5-boilerplate/blob/master/.htaccess for a full list.