I’ve deployed a JupyterHub on the cloud using Z2JH, and while I know that at some point I’ve been able to download files from within JupyterLab by rightclicking on a file and pressing download. I can no longer do it and I’m not sure what has changed since it worked. I have probably updated JupyterHub and JupyterLab and many others things since it worked.
The associated logs from the jupyter-notebook server is a single line warning:
[W 2019-03-29 09:07:23.958 SingleUserLabApp handlers:422] Blocking request with no referer
My Jupyter Lab version is 0.35.4, my Jupyter Notebook version is 5.7.6, and my Jupyter Hub is 0.9.4 on a quite recent z2jh helm chart release but before 1.0.0b1 was introduced some days ago.
I did some more googling and found this issue: https://github.com/jupyterlab/jupyterlab/issues/6106