Get a large image causes ReadTimeout error

I'm using docker-py for my project, and find out that cli.get_image() method will raise an exception if the image loading exceeds 60s. Following is the traceback:

  File "/usr/lib/python2.7/site-packages/docker/utils/decorators.py", line 21, in wrapped
    return f(self, resource_id, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/docker/api/image.py", line 17, in get_image
    res = self._get(self._url("/images/{0}/get", image), stream=True)
  File "/usr/lib/python2.7/site-packages/docker/utils/decorators.py", line 47, in inner
    return f(self, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/docker/client.py", line 112, in _get
    return self.get(url, **self._set_request_timeout(kwargs))
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 476, in get
    return self.request('GET', url, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 464, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 576, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/adapters.py", line 433, in send
    raise ReadTimeout(e, request=request)
requests.exceptions.ReadTimeout: UnixHTTPConnectionPool(host='localhost', port=None): Read timed out. (read timeout=60)

This works fine if the image is small and whole process can finish within 60s.
I don't know if this is a docker-py issue or docker api issue, but the feature I want is: get_image will return immediately, and I can stream the data later instead of waiting for all data is returned in one response(think about Large Image Size and Poor Network).

Here is the information:

docker-py==1.7.2
Python 2.7.10

# docker version
Client:
 Version:         1.9.1
 API version:     1.21
 Package version: docker-1.9.1-25.el7.centos.x86_64
 Go version:      go1.4.2
 Git commit:      78ee77d/1.9.1
 Built:           
 OS/Arch:         linux/amd64

Server:
 Version:         1.9.1
 API version:     1.21
 Package version: docker-1.9.1-25.el7.centos.x86_64
 Go version:      go1.4.2
 Git commit:      78ee77d/1.9.1
 Built:           
 OS/Arch:         linux/amd64

Start with docker/api/image.py and the get_image call, then follow the timeout handling through docker/utils/decorators.py and docker/client.py. Check how the request is configured for streaming and determine whether the client or Docker API is responsible for the 60-second ReadTimeout. Done means large image downloads can begin returning data without waiting for the whole response.