Dead simple HTTP server in Dart - snippet 1

gistfile1.dart

import 'dart:async';
import 'dart:io';

import 'package:route/server.dart';
import 'package:route/url_pattern.dart';

final Map<String, UrlPattern> Urls = {'/'       : new UrlPattern('/'),
                                      'ninja'   : new UrlPattern('/ninja'),
                                      'pirate'  : new UrlPattern('/pirate'),
                                      'samurai' : new UrlPattern('/samurai')};
final RegExp allUrls = new RegExp('/(.*)');

void main() {
  HttpServer.bind(InternetAddress.ANY_IP_V4, 8080).then((HttpServer server) {
    Router router = new Router(server)
      ..filter(allUrls, logVisitor)
      ..serve(Urls['/']).listen(serveHome)
      ..serve(Urls['ninja']).listen((HttpRequest r) => servePage(r, 'Ninja'))
      ..serve(Urls['pirate']).listen((HttpRequest r) => servePage(r, 'Pirate'))
      ..serve(Urls['samurai']).listen((HttpRequest r) => servePage(r, 'Samurai'))
      ..defaultStream.listen(send404);
  });
}

Future<bool> logVisitor(HttpRequest request) {
  print('Uri: ${request.uri} - Agent: ${request.headers.value('User-Agent')}');
  return new Future.value(true);
}

void serveHome(HttpRequest request) {
  StringBuffer sb = new StringBuffer();

  sb.write('<h1>Home</h1>');
  sb.write('<p><a href="/ninja">Ninja</a></p>');
  sb.write('<p><a href="/pirate">Pirate</a></p>');
  sb.write('<p><a href="/samurai">Samurai</a></p>');

  writeAndClose(request, sb.toString());
}

void servePage(HttpRequest request, String kind) {
  StringBuffer sb = new StringBuffer();

  sb.write('<h1>${kind}</h1>');
  sb.write('<p><a href="/">Go home</a></p>');

  writeAndClose(request, sb.toString());
}

void writeAndClose(HttpRequest request, String content) {
  request.response.write(content);
  request.response.close();
}