init

config.ru

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+require 'rubygems'
+require 'erb'
+require 'rack'
+
+class Joke
+
+  #print_r and vardump for completeness  
+  def vardump(o)
+    o.inspect
+  end
+
+  def print_r(o)
+    o.inspect
+  end
+
+  #support for array('s',1,4);
+  def array(*arr)
+    arr
+  end
+
+  #support for <? ?>
+  def _preprocess(str)
+    str = str.gsub('<?', '<%')
+    str = str.gsub('?>', '%>')
+  end
+
+  #the rack interface
+  def call(env)
+    req = Rack::Request.new(env)
+    path = env['REQUEST_PATH'].sub('/','')
+    if path == ''
+      path = 'index.rb'
+    end
+    if File.exists?(path)
+      # $_GET, $_POST and $_REQUEST support
+      eval('$_REQUEST,$_' << env['REQUEST_METHOD'] << '= req.params,req.params')
+      response = ERB.new(_preprocess(File.read(path))).result(binding)
+      # ensure data doesn't stick around between requests
+      $_GET, $_POST, $_REQUEST = nil
+      [200, {"Content-Type" => "text/html", "Content-Length" => response.length.to_s}, response]
+    else
+      [404, {"Content-Type" => "text/plain", "Content-Length" => '3'}, '404']
+    end
+  end
+end
+
+run Joke.new 

form.rb

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+<h1>Parameter Testing:</h1>
+$_GET:<br/>
+<?= print_r($_GET) ?><br/>
+$_POST:<br/>
+<?= print_r($_POST) ?><br/>
+$_REQUEST:<br/>
+<%= print_r($_REQUEST)?><br/>
+<br/>
+
+<h1>Form result:</h1>
+Your name is <%= $_POST["first_name"]%> <%= $_POST["last_name"] %>
+

index.rb

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+<h1>Parameter Testing:</h1>
+$_GET:<br/>
+<?= print_r($_GET) ?><br/>
+$_POST:<br/>
+<?= print_r($_POST) ?><br/>
+$_REQUEST:<br/>
+<%= print_r($_REQUEST)?><br/>
+<br>
+
+array(1,2,3) = <%= print_r(array(1,2,3)) %>
+
+<h1>Forms:</h1>
+<form action="form.rb" method="post">
+First Name: <input type="text" name="first_name">
+Last Name: <input type="text" name="last_name">
+<input type="submit" value="submit">
+</form>
+