nosignal.py

from __future__ import print_function, division, absolute_import
import flask

app = flask.Flask(__name__)

@app.route('/')
def index():
    return u'Hello'

@app.after_request
def after(obj):
    print("After:", obj)
    1 / 0
    return obj

@app.teardown_appcontext
def last(exc):
    print("Last:", exc)

app.run(debug=False)

withsignal.py

from __future__ import print_function, division, absolute_import
import flask

app = flask.Flask(__name__)

@app.route('/')
def index():
    return u'Hello'

@app.after_request
def after(obj):
    print("After:", obj)
    1 / 0
    return obj

@flask.appcontext_tearing_down.connect_via(app)
def last(sender, exc):
    print("Last:", sender, exc)

app.run(debug=False)