location /chwala
{
    index index.php;
    alias /usr/share/kolab-chwala/public_html;
    try_files $uri $uri/ @chwalaapi;
    client_max_body_size 100M; # set maximum upload size

    # enable php
    location ~ \.php$
    {
        include fastcgi_params;
        fastcgi_pass unix:/run/php5-kolab-chwala.sock;
        fastcgi_param SCRIPT_FILENAME $request_filename;
        fastcgi_pass_header X-Session-Token;
    }
}

location @chwalaapi
{
    rewrite ^/chwala/api/(.*)\.(.*)$ /chwala/api/index.php?service=$1&method=$2 last;
}