@app.route('/')
@app.route('/login',methods=['GET', 'POST'])
def login():
    error=None
    if request.method =='POST':
        s = Server('appauth.corp.domain.com:636', use_ssl=True, get_info=ALL)
        c = Connection(s,user=request.form['username'],password=request.form['password'],check_names=True, lazy=False,raise_exceptions=False)
    c.open()
    c.bind()

    if request.form['username'].lower() not in users  or (c.bind() != True) is True:
        error='Invalid credentials. Please try again'
    else:
        session['username'] = request.form['username'].lower()
        return redirect(url_for('index'))
return render_template('login.html',error=error)
@app.route('/index',methods=['GET','POST'])
def index():
    if 'username' in session:
       return render_template('index.html')
@app.route('/logout')
def logout():
# remove the username from the session if it's there
    session.pop('username', None)
    return redirect(url_for('login'))