splattael/refresh.rb

## refresh.rb
require 'sinatra'

enable :sessions

helpers do
  def refreshed?
    # TODO better refresh logic
    %w(max-age=0 no-cache).include?(env['HTTP_CACHE_CONTROL'])
  end

  def increment!
    session[:counter] += 1
  end
end

before do
  session[:counter] ||= 0
end

get '/' do
  increment! if refreshed?
  @counter = session[:counter]
  @http_headers = env.select { |(key, _)| key =~ /^HTTP/ }
  erb :counter
end

get '/increment' do
  increment!
  redirect '/'
end

__END__
@@ layout
<html>
  <%= yield %>
</html>

@@ counter
<p>counter: <%= @counter %></p>

<p>
  <a href="/">reload page</a> (no increment) |
  <a href="/increment">increment</a> or press F5 (FF) or CTRL-F5 (IE + FF)
</p>

<hr/>

<% @http_headers.each do |key, value| %>
<strong><%= key %>:</strong> <%= value.inspect %><br/>
<% end %>
	require 'sinatra'

	enable :sessions

	helpers do
	def refreshed?
	# TODO better refresh logic
	%w(max-age=0 no-cache).include?(env['HTTP_CACHE_CONTROL'])
	end

	def increment!
	session[:counter] += 1
	end
	end

	before do
	session[:counter] \|\|= 0
	end

	get '/' do
	increment! if refreshed?
	@counter = session[:counter]
	@http_headers = env.select { \|(key, _)\| key =~ /^HTTP/ }
	erb :counter
	end

	get '/increment' do
	increment!
	redirect '/'
	end

	__END__
	@@ layout
	<html>
	<%= yield %>
	</html>

	@@ counter
	<p>counter: <%= @counter %></p>

	<p>
	<a href="/">reload page</a> (no increment) \|
	<a href="/increment">increment</a> or press F5 (FF) or CTRL-F5 (IE + FF)
	</p>

	<hr/>

	<% @http_headers.each do \|key, value\| %>
	<strong><%= key %>:</strong> <%= value.inspect %><br/>
	<% end %>