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See #1049

---------
Signed-off-by: Wang, Yi A <yi.a.wang@intel.com>
Co-authored-by: Wang, Yi <yi.a.wang@intel.com>

# What does this PR do?

Now clients which do not specify a max_length will be implying
`max_new_tokens = max_total_tokens - input_length`.
This is a serious change, but which seems more in line with what users
expect from standing server.

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Co-authored-by: OlivierDehaene <olivier@huggingface.co>

# What does this PR do?

Upgrade all relevant versions and dependencies.

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Co-authored-by: Vincent Brouwers <vincent.brouwers@ing.com>

# What does this PR do?

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# What does this PR do?

This is purely code style - not anything important.
Instead of writing `req.0` all over we can use
[descructuring](https://doc.rust-lang.org/rust-by-example/flow_control/match/destructuring/destructure_structures.html)
to access the contained value that we actually want.

(Destructuring in function parameters
[here](https://doc.rust-lang.org/reference/items/functions.html#function-parameters))

## Before submitting
- [ ] This PR fixes a typo or improves the docs (you can dismiss the
other checks if that's the case).
- [x] Did you read the [contributor
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      Pull Request section?
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[documentation
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@OlivierDehaene

Close #571

# What does this PR do?

In title. Adds argument `--hostname` in router to support something like
`--hostname ::`. Tested with

```commandline
cargo run -- --port 8080 --hostname ::
curl -I -X GET 'http://[::1]:8080/health

'  # failed before this commit
```

Trigger CI

---------
Co-authored-by: Phil Chen <philchen2000@gmail.com>

Closes #478

# This PR adds an http header option to disable buffering for the
generate_stream endpoint response stream.

Problem: If a model is run behind a proxy server such as nginx that has
buffering enabled then the response stream from generate_stream gets
aggregated into a single response which basically disables streaming.
Instead of getting a chunked response where each token is presented over
time the response presents everything all at once.

Solution: This change adds the `X-Accel-Buffering` http header which
disables buffering for the generate_stream response, allowing the
response to stream properly.

Close #288

Closes #307 #308

@njhill FYI

Fixes #333

---------
Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

Co-authored-by: OlivierDehaene <23298448+OlivierDehaene@users.noreply.github.com>
Co-authored-by: OlivierDehaene <olivier@huggingface.co>

Co-authored-by: Nick Hill <nickhill@us.ibm.com>