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Seems like POST values are lost when .htaccess RewriteRule used. GET values are OK. How to fix?
RewriteCond %{REQUEST_METHOD} !POST
RewriteRule ^index.php / [L,R=301]

<IfModule mod_rewrite.c>

RewriteEngine on

RewriteCond %{REQUEST_URI} !^/(css|images|js)/

# don't rewrite existing files, directories and links

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l


# rewrite everything else to index.php

RewriteRule .* index.php [L]

</IfModule>