Cannot save. UnicodeDecodeError

[Kenji Kina]

I recently installed the official Tensorflow CPU Docker image which comes with Jupyter Notebook.

I can use it without any trouble, but it won't save at all. Whenever it tries to autosave, it drops me a small nondescript message. Also, every time I try to save and checkpoint, it gives me the following error:

Extracted from the browser inspector I get the following text:

Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/notebook/base/handlers.py", line 457, in wrapper

    result = yield gen.maybe_future(method(self, *args, **kwargs))

  File "/usr/local/lib/python2.7/dist-packages/tornado/gen.py", line 1015, in run

    value = future.result()

  File "/usr/local/lib/python2.7/dist-packages/tornado/concurrent.py", line 237, in result

    raise_exc_info(self._exc_info)

  File "/usr/local/lib/python2.7/dist-packages/tornado/gen.py", line 285, in wrapper

    yielded = next(result)

  File "/usr/local/lib/python2.7/dist-packages/notebook/services/contents/handlers.py", line 234, in put

    model = self.get_json_body()

  File "/usr/local/lib/python2.7/dist-packages/notebook/base/handlers.py", line 326, in get_json_body

    body = self.request.body.strip().decode(u'utf-8')

  File "/usr/lib/python2.7/encodings/utf_8.py", line 16, in decode

    return codecs.utf_8_decode(input, errors, True)

UnicodeDecodeError: 'utf8' codec can't decode byte 0x81 in position 4477: invalid start byte

I've changed the locale of my docker container's OS (Ubuntu Linux) to explicit en_US.UTF-8 and en_US.ISO-8859-1 but it hasn't helped.

I am at my wits end. Can anyone give me a hand with this?

[Thomas Kluyver]

Is it different with a different browser? The error looks like the browser is producing JSON that's not valid UTF-8, which as far as I know should never be the case.

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[Kenji Kina]

The message originally happened on Chrome, but I just tried on Firefox and Edge and I get the same result.

[Thomas Kluyver]

Does it work if you clear all output before saving? Can you give detailed steps to reproduce it?

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[Kenji Kina]

Yes, I did as follows:

1. Installed Docker on my Windows 10 PC, configured for Hyper-V. Windows region configuration is United States, but locale is Spanish - Peru. 
   
2. Downloaded the Tensorflow CPU Docker container.
3. Ran as is, and had issues saving outright.
4. Updated every package through apt and pip as far as I know, still had issues.
5. Configured the container's locale as en_US.UTF-8, es_ES.UTF-8, en_US.ISO-8859-1, es_ES.ISO-8859-1. None made any difference

That's where I am right now.

[Kenji Kina]

Just tried again now and it's working normally. I am not sure which of the steps I tried solved the issue. Anyways, feel free to ignore this thread now. 

Thank you very much for your time.

[Kenji Kina]

For future reference, the latest Docker update was what probably solved the issue, probably one of these:

• Support for UTF-8 in Dockerfiles #23372
• Skip UTF-8 BOM bytes from Dockerfile and .dockerignore if exist #23234

The update was pushed to my PC just today.

[Thomas Kluyver]

I don't think supporting UTF-8 in Dockerfiles would have any bearing on what the browser sends to the server when saving a notebook, but if it's working for you now, I'm inclined to write it off as a corner case, at least until it comes up again.

To view this discussion on the web visit https://groups.google.com/d/msgid/jupyter/94c203e0-ae56-4373-ac82-aa91e7761aee%40googlegroups.com.