title: Python Flask App route not working as expected
body: <p>I am not able to get the <a href="http://127.0.0.1:5000/user1" rel="nofollow noreferrer">http://127.0.0.1:5000/user1</a> Url from the browser every time it gives 404 and for the <a href="http://127.0.0.1:5000" rel="nofollow noreferrer">http://127.0.0.1:5000</a> it gives old output which I have tried (some other string "Hello flask") instead of "hello world"
  I have tried closing my IDE and trying again even I have created another project but the problem still persist</p>
  
  <p>Thanks in advance!</p>
  
  <pre><code>#imports
  app = Flask(__name__) 
  @app.route('/')
  def hello_world():
      return 'hello world!'
  
  #add users to collection "app_users"
  @app.route('/user1',methods=['POST'])
  def add_user():
      if not request.json or not 'email_id' in request.json:
         abort(404)
      print("processing")
      insert(request)
      return flask.jsonify({'status': "inserted successfully"}), 201
  
  if __name__ == '__main__':
      app.run()
  </code></pre>