title: Flask: How to remove cookies?
body: <p>I set cookies with the code suggested in the docs:</p>
  
  <pre><code>from flask import make_response
  
  @app.route('/')
  def index():
      resp = make_response(render_template(...))
      resp.set_cookie('username', 'the username')
      return resp
  </code></pre>
  
  <p>But how do I remove them? There is no remove_cookie method. I tried:</p>
  
  <pre><code>if request.cookies.get('sessionID');
      request.cookies.pop('sessionID', None)
  </code></pre>
  
  <p>but it turns out that the request.cookies object is immutable. What do I do?</p>