未在烧瓶会话中设置的密钥

Question

我在运行Flask（一个Python模块）中得到0会话。

现在我用的烧瓶第三方库Flask-Session

当我连接到我的网站，我收到以下错误：

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

下面是我的服务器代码。

from flask import Flask, session 
from flask.ext.session import Session 

SESSION_TYPE = 'memcache' 

app = Flask(__name__) 
sess = Session() 

nextId = 0 

def verifySessionId(): 
    global nextId 

    if not 'userId' in session: 
     session['userId'] = nextId 
     nextId += 1 
     sessionId = session['userId'] 
     print ("set userid[" + str(session['userId']) + "]") 
    else: 
     print ("using already set userid[" + str(session['userId']) + "]") 
    sessionId = session.get('userId', None) 
    return sessionId 

@app.route("/") 
def hello(): 
    userId = verifySessionId() 
    print("User id[" + str(userId) + "]") 
    return str(userId) 

if __name__ == "__main__": 
    app.secret_key = 'super secret key' 

    sess.init_app(app) 

    app.debug = True 
    app.run() 

正如你所看到的，我确实设置了应用密钥。我究竟做错了什么？

是否有其他会话选项？

其他信息： 对Linux Mint的运行的Python 2.7

完全贴：

Traceback (most recent call last): 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__ 
    return self.wsgi_app(environ, start_response) 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app 
    response = self.make_response(self.handle_exception(e)) 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception 
    reraise(exc_type, exc_value, tb) 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app 
    response = self.full_dispatch_request() 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request 
    rv = self.handle_user_exception(e) 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception 
    reraise(exc_type, exc_value, tb) 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request 
    rv = self.dispatch_request() 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request 
    return self.view_functions[rule.endpoint](**req.view_args) 
    File "/home/sean/code/misc/session/sessiontest.py", line 27, in hello 
    userId = verifySessionId() 
    File "/home/sean/code/misc/session/sessiontest.py", line 16, in verifySessionId 
    session['userId'] = nextId 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/werkzeug/local.py", line 341, in __setitem__ 
    self._get_current_object()[key] = value 
    File "/home/sean/code/misc/hangman/venv/lib/python2.7/site-packages/flask/sessions.py", line 126, in _fail 
    raise RuntimeError('the session is unavailable because no secret ' 
RuntimeError: the session is unavailable because no secret key was set. Set the secret_key on the application to something unique and secret. 

Answer 1

唯一的例外是由NullSessionInterface会话实现，这是默认会话类型当您使用瓶上调-session。这是因为你实际上没有给配置SESSION_TYPE Flask;这是不够将其设置为您的模块中的全局。

这个默认值对Flask 0.10没有多大意义;它可能对Flask 0.8或0.9有意义，但当前版本被用作错误信号。在你的情况下，它现在给你错误的错误信息。

将SESSION_TYPE配置选项设置为其他值。选择redis,memcached,filesystem或mongodb之一。

将其设置为filesystem是最简单的;有足够的默认配置那里有没有额外的依赖项工作：

if __name__ == "__main__": 
    app.secret_key = 'super secret key' 
    app.config['SESSION_TYPE'] = 'filesystem' 

    sess.init_app(app) 

    app.debug = True 
    app.run() 

Answer 2

试试这个：

app = Flask(__name__) 
app.config['SESSION_TYPE'] = 'memcached' 
app.config['SECRET_KEY'] = 'super secret key' 
sess = Session() 

，并在底部删除您app.secret_key分配。

Answer 3

设置if __name__ == '__main__':

app.py的秘密密钥外：

from flask import Flask, session 

app = Flask(__name__) 
app.secret_key = "super secret key" 

@app.route("/") 
... 

if __name__ == '__main__': 
    app.debug = True 
    app.run() 

如果使用flask run来运行你的应用，而python app.py__name__ != '__main__'。