Najaf · June 1, 2014 00:04 · Jun 1, 2014
diff --git a/simple-response.rb b/simple-response.rb
@@ -0,0 +1,59 @@
+#! /usr/bin/env ruby
+
+require 'socket'
+
+def log(source, message)
+  time = Time.now.strftime("%Y-%m-%d %H:%M:%S")
+  puts "[%s] %s => %s" % [time, source, message]
+end
+
+# Class representing HTTP Requests
+Request = Struct.new(:method, :uri, :version, :headers) do
+  def self.parse(client)
+    # parse the request line
+    method, uri, version = client.readline.split
+
+    Request.new(method, uri, version, {}).tap do |r|
+      # read the headers
+      until (header_line = client.readline).strip == '' do
+        header, value = header_line.split(':').map { |s| s.strip }
+        r.headers[header] = value
+      end
+    end
+  end
+end
+
+Response = Struct.new(:version, :status_code, :reason_phrase, :headers, :body) do
+  def to_s
+    response = "#{version} #{status_code} #{reason_phrase}\r\n"
+    headers.each do |key, value|
+      response << "#{key}: #{value}\r\n"
+    end
+    response << "\r\n"
+    response << body
+  end
+end
+
+server = TCPServer.new ARGV.first.to_i
+
+loop do
+  client = server.accept
+  info = client.remote_address
+  source = "%s:%s" % [info.ip_address, info.ip_port]
+
+  log source, "Connection established"
+
+  request = Request.parse(client)
+  log source, "Method = %s | URI = %s | Version = %s" % [request.method, request.uri, request.version]
+  log source, "Headers = %s" % request.headers.inspect
+
+  response = Response.new("HTTP/1.1", 200, 'OK').tap do |r|
+    r.body    = '<h1>Hello, world!</h1>'
+    r.headers = {
+      'Connection'     => 'close',
+      'Content-Type'   => 'text/html',
+      'Content-Length' => r.body.bytes.length
+    }
+  end
+  client.write(response)
+end
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