How to render a plain HTML file with Sinatra?

Question

I have a simple sinatra application. All I want to do is use it as a wrapper to serve a static HTML file at a specific route. My directory structure looks like this:

Answer 1

This is work for me:

require 'rubygems'
require 'sinatra'

get '/index.html' do
    @page_title = 'Home'
    @page_id = 'index.html'
    erb :'index.html', { :layout => :'layout.html' }
end