old_contents: #!/usr/bin/env python
  # coding=utf-8
  # author: xsl
  
  from flask import Flask
  
  app = Flask(__name__)
  
  @app.route("/")
  def index():
      return "hello leancloud"
  
new_contents: #!/usr/bin/env python
  # coding=utf-8
  # author: xsl
  
  from flask import Flask
  
  app = Flask(__name__)
  
  @app.route("/")
  def index():
      return "hello leancloud"
  
  @app.route("/xiu")
  def xiu():
      return "<a href=\"http://www.insword.cn\">insword</a>"
  
subject: add route '/xiu'