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

I have a use case where we need to pass cookies (for auth reasons) to an
internally hosted server.

Note: I couldn't get the client tests to pass - do you need to have an
HF token?

```python
FAILED tests/test_client.py::test_generate - text_generation.errors.BadRequestError: Authorization header is correct, but the token seems invalid
```

…ed models

closes #111

closes #112

closes #105

closes #99

closes #80