diff --git a/src/llmperf/models.py b/src/llmperf/models.py
index be0d7ea..0c2e1b5 100644
--- a/src/llmperf/models.py
+++ b/src/llmperf/models.py
@@ -1,4 +1,4 @@
-from typing import Any, Dict, List, Optional, Tuple
+from typing import Any, Dict, Optional, Tuple
 from pydantic import BaseModel
 
 
diff --git a/src/llmperf/ray_clients/openai_chat_completions_client.py b/src/llmperf/ray_clients/openai_chat_completions_client.py
index f2e0a91..2ee9931 100644
--- a/src/llmperf/ray_clients/openai_chat_completions_client.py
+++ b/src/llmperf/ray_clients/openai_chat_completions_client.py
@@ -5,6 +5,7 @@
 
 import ray
 import requests
+from yarl import URL
 
 from llmperf.ray_llm_client import LLMClient
 from llmperf.models import RequestConfig
@@ -54,14 +55,9 @@ def llm_request(self, request_config: RequestConfig) -> Dict[str, Any]:
         if not key:
             raise ValueError("the environment variable OPENAI_API_KEY must be set.")
         headers = {"Authorization": f"Bearer {key}"}
-        if not address:
-            raise ValueError("No host provided.")
-        if not address.endswith("/"):
-            address = address + "/"
-        address += "chat/completions"
         try:
             with requests.post(
-                address,
+                URL(address).with_path("/chat/completions"),
                 json=body,
                 stream=True,
                 timeout=180,