docs: function handler(req, res) {
  
    var parsedUrl = url.parse(req.url)
    var callback = qs.parse(parsedUrl.query).callback
    var filename = decodeURI(parsedUrl.path.substr(1).split('?')[0])
    var basename = path.basename(filename.split('?')[0])
    var extname = path.extname(basename)
    var response = reswrap(res);
    var notfound = function() {
      response.writeHead(404, 'text').end('');
    };
  
    if (req.method === 'GET' && parsedUrl.pathname === '/jsonp-request') {
      if (!!exitCountdown) {
        exitCountdown.restart();
      }
  
      response
        .writeHead(200, 'js')
        .end(callback +'('+ R.get('stamp') +')');
  
      return;
    }
  
    var serve;
    if (/^\/template/.test(parsedUrl.pathname)) {
      serve = check(join(__dirname, '..', filename))
    } else if (/^\/node_modules/.test(parsedUrl.pathname)) {
      serve = check(join(__dirname, '..', filename))
    }
    if (serve) {
      serve.pass(function(name, type) {
        response
          .writeHead(200, extname.substr(1))
          .pipeWith(fs.createReadStream(
            path.resolve(name)
          ))
      }).fail(notfound);
      return;
    }
  
    if (/^\.(md|mkd|markdown|html)$/.test(extname)) {
      check(filename)
        .pass(function() {
          response
            .writeHead(200, 'html')
            .end(template.render({
              title: basename,
              highlight: R.get('highlight') || 'default',
              theme: getTheme(R.get('css')),
              width: R.get('width'),
              body: parser.parse(read(path.resolve(filename)))
            }));
        }).fail(notfound);
  
      return;
    }
  
    // Image or some other resources.
    check(filename)
      .pass(function(name) {
        response
          .writeHead(200, name)
          .pipeWith(fs.createReadStream(name));
      }).fail(notfound)
  }