Update openai_chat_completions_client.py

merged from ray-project#41

Signed-off-by: Jack Hessel <jmhessel@gmail.com>

Author: jmhessel

src/llmperf/ray_clients/openai_chat_completions_client.py

@@ -59,6 +59,12 @@ def llm_request(self, request_config: RequestConfig) -> Dict[str, Any]:
         if not address.endswith("/"):
             address = address + "/"
         address += "chat/completions"
+        if "openai.azure.com" in address:
+            api_version = os.environ.get("OPENAI_API_VERSION")
+            if not api_version:
+                raise ValueError("the environment variable OPENAI_API_VERSION must be set for Azure OpenAI service.")
+            address = f"{address}?api-version={api_version}"
+            headers = {"api-key": key}  # replace with Authorization: Bearer
         try:
             with requests.post(
                 address,