server : (refactor) no more json in server_task input (#10691)

* server : (refactor) no more json in server_task input

* add test for slots endpoint

* add tests for /props and /slots

* remove task inf_type

* fix CI by adding safe_json_to_str

* add "model_path" to /props

* update readme

examples/server/tests/unit/test_chat_completion.py

@@ -30,6 +30,7 @@ def test_chat_completion(model, system_prompt, user_prompt, max_tokens, re_conte
         ],
     })
     assert res.status_code == 200
+    assert "cmpl" in res.body["id"] # make sure the completion id has the expected format
     assert res.body["model"] == model if model is not None else server.model_alias
     assert res.body["usage"]["prompt_tokens"] == n_prompt
     assert res.body["usage"]["completion_tokens"] == n_predicted
@@ -59,9 +60,13 @@ def test_chat_completion_stream(system_prompt, user_prompt, max_tokens, re_conte
         "stream": True,
     })
     content = ""
+    last_cmpl_id = None
     for data in res:
         choice = data["choices"][0]
         assert "gpt-3.5" in data["model"] # DEFAULT_OAICOMPAT_MODEL, maybe changed in the future
+        if last_cmpl_id is None:
+            last_cmpl_id = data["id"]
+        assert last_cmpl_id == data["id"] # make sure the completion id is the same for all events in the stream
         if choice["finish_reason"] in ["stop", "length"]:
             assert data["usage"]["prompt_tokens"] == n_prompt
             assert data["usage"]["completion_tokens"] == n_predicted