Resolved in 8486517 using user-agent sniffing. Not perfect, but it
should cover the _vast_ majority of cases.

> +			let remoteURL = url.searchParams.get("url")

To aid readability, let's use `const`. Naming the variables, e.g.,
`path` instead of `URL` would also help, when it is a path.

> +					statusCode: 401,
> +					content: "Unauthorized"

You need a `contentType`. Would `application/json` be appropriate?
`text/plain` would be acceptable too. Might be useful to make the
message something like `CloudTube: Unauthorised` to indicate to humans
that this response didn't hit the proxy. Otherwise it would be
ambiguous whether CT or NL gave this response.

You made a fair argument. Patch applied.

Thanks, I got this all sorted and working. I hacked at your commits a
bit to fix up a couple of issues, change the route, and add
auto-caption stuff. Hope you don't mind!

I agree that this would be useful for computers, but some mobile devices, 
when there is an autofocus field, will also bring up the keyboard 
automatically, which I find disorientating.

Ideally I'd like it to autofocus for computers only, and I'm not sure how 
I'd do that.

Cadence

Patch applied, thanks.

Thanks for this. Your patch didn't apply cleanly, but I believe I have
made the required changes by hand. Let me know if it's all correct!

Okay, wow, that's really interesting and I do agree with those decisions. 
I'll give this a check to see how it works in practice, then I think this 
is good to be merged.

Hi, I'm finally getting to look at this. Thank you so much for your
patience.

> +/configuration.py

Did you mean to put the main configuration file in dockerignore?

> +COPY ./requirements.txt /workdir/requirements.txt
> +
> +RUN pip install -r requirements.txt
> +
> +COPY . /workdir

Is there a reason why you don't `COPY .` straight away? Why 2 copy

Thanks so much for this! Tomorrow I can properly review it, but taking a 
peek at the code now, there's a couple of things that stand out to me:

- kind should be `captions` since it is a transcription of audio, not a 
translation; see 
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/track
- should put the result of `getSettingsOrDefaults` in a variable to make 
it easier to extract other settings in the future
- should validate the `lang` query parameter somehow

I can deal with these notes on my own tomorrow, as well as doing my full 
review, but if you want make these changes yourself, you're free to 
submit an updated patch.