Update example app.

experimental/example/app/app.py

@@ -48,12 +48,26 @@ def ignore_error(f):
     logging.error("Error executing function", exc_info=sys.exc_info())
   return "Error"
 
-@app.route('/')
+# this root is for the tracing demo
+@app.route('/hello')
 def hello():
   qotd_msg = do_qotd()
   qotd_msg = do_echo(qotd_msg)
   return qotd_msg
 
+# this is for normal demos
+@app.route('/')
+def root():
+  counter_future = pool.submit(do_redis)
+  search_future = pool.submit(do_search)
+  qotd_future = pool.submit(do_qotd)
+  echo_future = pool.submit(lambda: do_echo("foo"))
+  result = 'Hello World! I have been seen %s times.' % ignore_error(counter_future.result)
+  result += ignore_error(search_future.result)
+  result += ignore_error(qotd_future.result)
+  result += ignore_error(echo_future.result)
+  return result
+
 if __name__ == "__main__":
   logging.basicConfig(format='%(asctime)s %(levelname)s %(filename)s:%(lineno)d - %(message)s', level=logging.INFO)
   WSGIRequestHandler.protocol_version = "HTTP/1.1"