Docker让Flask服务器运行,但我无法用浏览器连接到它

我正试图通过Docker运行我的flask应用程序。我上周就开始工作了,但现在它给了我一些问题。我可以启动服务器,但似乎无法通过浏览器访问任何内容。

这是我的 app.py 文件(减少):

... imports ...
app = Flask(__name__)
DATABASE = "users.db"
app.secret_key = os.environ["SECRET_KEY"]
app.config['UPLOAD_FOLDER'] = 'static/Content'

BASE_PATH = os.path.dirname(os.path.abspath(__file__))

# For Dropbox
__TOKEN = os.environ["dbx_access_token"]
__dbx = None 

... functions ...


if __name__ == '__main__':
     app.run(port=5001, threaded=True, host=('0.0.0.0'))

这是我的 Dockerfile :

# Use an official Python runtime as a parent image
FROM python:3

# Set the working directory to /VOSW-2016-original
WORKDIR /VOSW-2016-original

# Copy the current directory contents into the container at /VOSW-2016-original
ADD . /VOSW-2016-original

# Putting a variables in the environment
ENV SECRET_KEY="XXXXXXXX"
ENV dbx_access_token="XXXXXXXX"

# Install any needed packages specified in requirements.txt
RUN pip install --trusted-host pypi.python.org -r requirements.txt

# Make port 8000 available to the world outside this container
EXPOSE 8000

# Run app.py when the container launches
CMD ["python", "app.py", "--host=0.0.0.0"]

以下是我用来启动服务器的命令:

docker build -t vosw_original ./VOSW-2016-original/

然后:

docker run -i -t -p 5001:8000 vosw_original

然后我得到消息:

* Running on http://0.0.0.0:5001/ (Press CTRL+C to quit)

因此,服务器似乎正在运行,但当我执行以下任一操作时,似乎无法访问它:

1. http://0.0.0.0:5001/
2. http://0.0.0.0:8000/
3. http://127.0.0.1:5001/
4. http://127.0.0.1:8000/

我哪里出错了?