Drag-and-drop plugin fails with "'_xrsf' missing from POST"

Platform: Jupyter 4.2.1, Python 3.6.0, Chrome 55.

Well I really need this function, but it can't work in Chrome. Here is the log in Javascript Console:

[Warning] namespace.js:10 accessing `utils` is deprecated. Use `require("base/js/utils")` 
[Error] PUT http://localhost:8888/api/contents/21.jpg 403 (Forbidden)
[Log] Data transfer for drag-and-drop failed.

And the log in Jupyter:

[I 17:15:31.188 NotebookApp] Uploading file to
[W 17:15:31.206 NotebookApp] 403 PUT /api/contents/21.jpg (::1): '_xsrf' argument missing from POST
[W 17:15:31.208 NotebookApp] 403 PUT /api/contents/21.jpg (::1) 4.24ms referer=http://localhost:8888/notebooks/test.ipynb

It seems that the server rejected the uploading file. So is there any solution?

[juhasch]

This works for me in both Safari and Chrome with notebook 4.2.1.
This might be the issue for newer notebook versions : jupyter/notebook#1969
I will need to check what we can do to fix this.

I just upgraded the plugins:

pip3 install -U https://github.com/ipython-contrib/jupyter_contrib_nbextensions/tarball/master
jupyter contrib nbextension install --user

Thanks, it works pretty well in Chrome now.

But when I try to upload an image which downloaded from network with a %2F in its name, Jupyter returns an error: Error while saving file: xxx/xxx.jpeg [Errno 2] No such file or directory. I know this bug is not a big deal, but I will appreciate it if you can fix it...