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Here is a code for the programs, and for some strange reason, I got the warning text:
403 PUT /api/contents/[file.ipynb] (::1): '_xsrf' argument missing from POST
'_xsrf' argument missing from post
Even though I copied some suggestion codes, it does not work. What can I do for the _xsrf’ argument missing from post issue? Is there a better approach?
The cause: This error perhaps due to chrome block the cookie due to the request is from different site.
Solution: You can save any notebooks that previously showed the _xsrf error by simply opening another notebook (non-running, not existing) on the same kernel.
Although it seems simple, the solution I found worked. Refresh your browser and go to the /tree page, also known as Jupyter. Worked.