AttributeError：“NoneType”对象在使用 Braintree 的 GAE 中没有属性“wrap_socket”

Question

我正在 Google App Engine 中测试一个嵌入 Braintree 平台的应用。我正在使用他们的代码进行这个测试来处理一个虚构的交易。在我的 html 中，我有一个表单，提交时会将其信息路由到下面的“/create_transaction”。服务器代码是：

@app.route("/create_transaction", methods=["POST"])
def create_transaction():
    result = braintree.Transaction.sale({
        "amount": "1000.00",
        "credit_card": {
            "number": request.form["number"],
            "cvv": request.form["cvv"],
            "expiration_month": request.form["month"],
            "expiration_year": request.form["year"]
        },
        "options": {
            "submit_for_settlement": True
        }
    })
    if result.is_success:
        return "<h1>Success! Transaction ID: {0}</h1>".format(result.transaction.id)
    else:
        return "<h1>Error: {0}</h1>".format(result.message) 

浏览器没有返回结果，而是呈现内部服务器错误 500。Traceback 如下：

ERROR    2014-09-26 03:08:13,852 app.py:1423] Exception on /create_transaction [POST]
Traceback (most recent call last):
  File "/home/manuel/Google/braintree_app/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/manuel/Google/braintree_app/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/manuel/Google/braintree_app/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/manuel/Google/braintree_app/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/manuel/Google/braintree_app/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/manuel/Google/braintree_app/app.py", line 40, in create_transaction
    "submit_for_settlement": True
  File "/home/manuel/Google/braintree_app/braintree/transaction.py", line 302, in sale
    return Transaction.create(params)
  File "/home/manuel/Google/braintree_app/braintree/transaction.py", line 397, in create
    return Configuration.gateway().transaction.create(params)
  File "/home/manuel/Google/braintree_app/braintree/transaction_gateway.py", line 33, in create
    return self._post("/transactions", {"transaction": params})
  File "/home/manuel/Google/braintree_app/braintree/transaction_gateway.py", line 137, in _post
    response = self.config.http().post(url, params)
  File "/home/manuel/Google/braintree_app/braintree/util/http.py", line 49, in post
    return self.__http_do("POST", path, params)
  File "/home/manuel/Google/braintree_app/braintree/util/http.py", line 71, in __http_do
    raise e
AttributeError: 'NoneType' object has no attribute 'wrap_socket'

为什么 GAE 会抛出这个异常？

Answer 1

_{我在布伦特里工作。如果您需要更多帮助，可以随时get in touch with our support team。}

这似乎是problem with certain versions of urllib3 / requests (a Braintree dependency) on GAE。

尝试将此添加到您的 app.yaml 文件中：

libraries:
- name: ssl
  version: latest

并确保您为应用程序启用了计费功能。

如果这不能解决问题，您可以查看上面链接的 github 问题以获取更多信息。