Google App Engine - Flask Application Bypassing Standard Google Auth on Devserver - google-app-engine

Question

I am new to Flask and I am trying to organize my code as a large application for deployment on Google App Engine. I am using Flask-Classy to help organize my application into logical packages.
The application runs on the dev server just fine with one exception. When I set login: required or login: admin in my app.yaml (see app.yaml below), the application appears to skip over the mock Google Login page and automatically signs in as 'test#example.com'.
Normally, I would expect to see the standard Google mock authentication form (below) when login:required or login: admin is set in the app.yaml. However, when I point the browser to the '/' or any other uri, I am directed right to the respective page without authenticating via this form.
I am not sure what I am missing/doing wrong. I am not getting any type of errors.
Below, I have included my application's structure and most of the pertinent code to see if anyone might be able to point out anything I am doing wrong here.
/flask_app
/flask_app
/mod_one
/__init__.py
/forms.py
/views.py
/models.py
/mod_two
/__init__.py
/forms.py
/views.py
/models.py
/static
/css
...
/templates
/index.html
...
/__init__.py
/settings.py
/urls.py
/lib
/app.yaml
/appengine_config.py
/main.py
app.yaml
application: flask-app
version: 1
runtime: python27
api_version: 1
threadsafe: yes
default_expiration: "30d"
builtins:
- deferred: on
- admin_redirect: on
handlers:
- url: /css
static_dir: flask_app/static/css
- url: /admin/.*
script: main.app
login: admin
- url: /.*
script: main.app
login: required
appengine_config.py
import sys
import os.path
sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'lib'))
main.py
from flask_app import app
app = app
flask_app/init.py
import os
from flask import Flask
from flask_bootstrap import Bootstrap
from werkzeug.debug import DebuggedApplication
app = Flask(__name__)
if os.getenv('FLASK_CONF') == 'TEST':
app.config.from_object('flask_app.settings.Testing')
elif 'SERVER_SOFTWARE' in os.environ and os.environ['SERVER_SOFTWARE'].startswith('Dev'):
# Development settings
app.config.from_object('flask_app.settings.Development')
app.wsgi_app = DebuggedApplication(app.wsgi_app, evalex=True)
else:
app.config.from_object('flask_app.settings.Production')
# Instantiate Flask-Bootstrap.
Bootstrap(app)
import urls
flask_app/urls.py
from flask import render_template
from flask_app import app
#app.route('/')
def index():
params = {
'page_title': 'Home'
}
return render_template('index.html', **params)
#app.route('/contact')
def contact():
params = {
'page_title': 'Contact'
}
return render_template('contact.html', **params)
#app.route('/about')
def about():
params = {
'page_title': 'About'
}
return render_template('about.html', **params)
# Error handlers
# Handle 404 errors
#app.errorhandler(404)
def page_not_found(e):
return render_template('404.html'), 404
# Handle 500 errors
#app.errorhandler(500)
def server_error(e):
return render_template('500.html'), 500
# Register Flask Classy Classes
import mod_one.views as mod_one
import mod_two.views as mod_two
mod_one.OneView.register(app)
mod_two.TwoView.register(app)

Answer 1

As #Greg pointed out in a comment to the question, I was already 'logged in' to the dev_appserver (which threw me off since I never saw the mock login page) so authentication was happening using the default 'test#example.com' user.
Once I went to /_ah/login I was able to access the mock login page and proceed as usual from there.