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# compression
<IfModule mod_deflate.c>
 # Serve gzip compressed CSS files if they exist 
 # and the client accepts gzip.
 RewriteCond %{HTTP:Accept-encoding} gzip
 RewriteCond %{REQUEST_FILENAME}\.gz -s
 RewriteRule ^(.*)\.css $1\.css\.gz [QSA]

 # Serve gzip compressed JS files if they exist 
 # and the client accepts gzip.
 RewriteCond %{HTTP:Accept-encoding} gzip
 RewriteCond %{REQUEST_FILENAME}\.gz -s
 RewriteRule ^(.*)\.js $1\.js\.gz [QSA]

 # Serve correct content types, and prevent mod_deflate double gzip.
 RewriteRule \.css\.gz$ - [T=text/css,E=no-gzip:1]
 RewriteRule \.js\.gz$ - [T=text/javascript,E=no-gzip:1]

 <FilesMatch (\.js\.gz|\.css\.gz)$>
 # Serve correct encoding type.
 Header append Content-Encoding gzip

 # Force proxies to cache gzipped & 
 # non-gzipped css/js files separately.
 Header append Vary Accept-Encoding
 </FilesMatch>
</IfModule>

• set up a redirect in htaccess file, just google "redirect http to https htaccess", there are lots of tutorials
• or you can change them into the database by running a sql command: (do a a backup first, or do it on a test forum)
  
  Code: [Select]

  UPDATE elkarte_messages set body = REPLACE(body,  'http://mydomain', 'https://mydomain');

• Step 4: Database Changes
• Step 5: Delete Upgrade