I cloned polymer starter kit and its working perfectly fine.
So in the placeholder route there is a page called http://localhost:5000/users/Rob. The above url works if I move from users page to Rob page by clicking on the rob link.
but if I directly paste on http://localhost:5000/users/Rob on browser and press enter, it does not work.
I assume the above might be resolved by using htaccess. but couldn't figure out how.
Below is my .htaccess code
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* /index.html [L,R=302]