V1:

#IfModule mod_ssl.c>

        <VirtualHost *:6901>

                ServerAdmin admin@tonetwork.de
                ServerName thwgat.tonetwork.de
                DocumentRoot /var/www/thwgat/thwgat_homepage/build/

                FallbackResource ./index.html

                LogLevel info

                ErrorLog ${APACHE_LOG_DIR}/error.log
                CustomLog ${APACHE_LOG_DIR}/access.log combined
                Options -Indexes


<Directory /var/www/thwgat/thwgat_homepage/build/>
#            Options FollowSymLinks MultiViews
#            AllowOverride None
#            Order allow,deny
#            allow from all

#        # ADDING FOLLOWING LINES SOLVED THE PROBLEM
        RewriteEngine on
#        # Don't rewrite files or directories
        RewriteCond %{REQUEST_FILENAME} -f [OR]
        RewriteCond %{REQUEST_FILENAME} -d
        RewriteRule ^ - [L]
#        # Rewrite everything else to index.html to allow html5 state links
        RewriteRule ^ /index.html [L]

</Directory>


</VirtualHost>


V2:


        <VirtualHost *:6901>

                ServerAdmin admin@tonetwork.de

                ServerName thwgat.tonetwork.de
                DocumentRoot /var/www/thwgat/thwgat_homepage/build/

                FallbackResource ./index.html

                LogLevel info

                ErrorLog ${APACHE_LOG_DIR}/error.log
                CustomLog ${APACHE_LOG_DIR}/access.log combined
                Options -Indexes


<Directory /var/www/thwgat/thwgat_homepage/build/>


#        # ADDING FOLLOWING LINES SOLVED THE PROBLEM
        RewriteEngine on
#        # Don't rewrite files or directories
        RewriteCond %{REQUEST_FILENAME} -f [OR]
        RewriteCond %{REQUEST_FILENAME} -d
        RewriteRule ^ - [L]
#        # Rewrite everything else to index.html to allow html5 state links
        RewriteRule ^ /index.html [L]

</Directory>

</VirtualHost>