title: Flask - 404 not found
body: <p>I am a newbie in the flask development this is my first program in the flask but it shows me this error:</p>
  
  <blockquote>
    <p>The requested URL was not found on the server. If you entered the URL
    manually please check your spelling and try again.</p>
  </blockquote>
  
  <p>&amp; this is my code </p>
  
  <pre><code>from flask import Flask
  
  app = Flask(__name__)
  
  
  @app.route('/index')
  def index():
      return 'Hello World'
  
  
  if __name__ == '__main__':
      app.run(debug=True)
  </code></pre>