Prevent llms/mlx_lm from serving the local directory as a webserver (#498)

* Don't serve local directory

BaseHTTPRequestHandler serves the current directory by default. Definitely not intended behaviour. Remove the "do_HEAD" and "do_GET" methods.

* Fix typo in method name

I assume hanlde_stream was intended to be called handle_stream

* Fix outdated typehint

load_model returns nn.Module, however fetch_from_hub was not updated to reflect the change

* Add some more type hints

* Add warnings for using in prod

Add a warning to README and runtime, discouraging use in production. The warning is the same as on the python docs for HTTPServer https://docs.python.org/3/library/http.server.html

* format

* nits

---------

Co-authored-by: Awni Hannun <awni@apple.com>

llms/mlx_lm/utils.py

@@ -390,7 +390,7 @@ def load(
 
 def fetch_from_hub(
     model_path: Path, lazy: bool = False
-) -> Tuple[Dict, dict, PreTrainedTokenizer]:
+) -> Tuple[nn.Module, dict, PreTrainedTokenizer]:
     model = load_model(model_path, lazy)
 
     config = AutoConfig.from_pretrained(model_path)