我试图按照github上的代码示例制作一个简单的Flask登录服务器。对于程序中的用户来说,它工作得很完美,但如果输入了错误的用户名,它就会给出一个500的内部服务器错误。任何建议都将是很棒的:)
@app.route('/login', methods=['GET', 'POST'])
def login():
if flask.request.method == 'GET':
return '''
<form action='login' method='POST'>
<input type='text' name='email' id='username' placeholder='email'/>
<input type='password' name='password' id='password' placeholder='password'/>
<input type='submit' name='submit'/>
</form>
'''
#return render_template('logins.html')
# if request.method == 'POST':
# username = request.form['username']
# password = request.form['password']
email = flask.request.form['email']
if flask.request.form['password'] == users[email]['password']:
user = User()
user.id = email
flask_login.login_user(user)
return flask.redirect(flask.url_for('protected'))
return 'Bad login'
Traceback (most recent call last):
File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 2446, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1951, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1820, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.5/dist-packages/flask/_compat.py", line 39, in reraise
raise value
File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1949, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1935, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "serv.py", line 65, in login
if flask.request.form['password'] == users[email]['password']:
KeyError: 's'
请编辑你的问题,添加错误回溯和你的代码,以保证完整性。
根据你提到的行为,我可以有一个大致的推测。你应该有一个user_loader回调函数,你在使用 login_user(user)
. 根据你的实现,这个函数可能会从数据库或内存中的字典或列表中加载用户。
如果你从字典中加载,很可能你没有异常处理,如果用户不存在一个实例,你的代码应该像下面一样。
@login_manager.user_loader
def load_user(userid):
try:
user = users[userid]
return user
except KeyError:
return None
上面的代码处理了异常并返回 None
以防用户不存在。这就是为什么 flask-login
将能够决定不登录用户,而你的程序不会返回错误。