code: function respond(res, httpCode, headers, body) {
  	headers = headers || {};
  	headers.pragma = 'no-cache';
  
  	res.writeHead(httpCode, headers);
  	res.end(body);
  }
docs: Sends an HTTP response, and injects a "Pragma: no-cache" header.
  
  @param {Object}        res       The HTTP response object.
  @param {number}        httpCode  The HTTP status code.
  @param {Object}        [headers] The HTTP response headers.
  @param {string|Buffer} body      The HTTP response body.