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Flask with a webserver breaks all sessions?
from flask import session

@app.route('/is_logged_in/')
def is_logged_in():
  return 'user' in session

RuntimeError: the session is unavailable because no secret key was set.
Set the secret_key on the application to something unique and secret.

application.secret_key = 'why would I tell you my secret key?'

from flask import redirect, session, url_for

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

@app.route('/is_logged_in/')
def is_logged_in():
    user = session.get('user', None)
    if user:
        return user
    return redirect(url_for('index'))