diff --git a/search4all.py b/search4all.py
index b3bce4f..cd9bc11 100644
--- a/search4all.py
+++ b/search4all.py
@@ -323,8 +323,8 @@ def search_with_searchapi(query: str, subscription_key: str):
 
 def new_async_client(_app):
     return AsyncOpenAI(
-        api_key=os.getenv["OPENAI_API_KEY"],
-        base_url=os.getenv["OPENAI_BASE_URL"],
+        api_key=os.getenv("OPENAI_API_KEY"),
+        base_url=os.getenv("OPENAI_BASE_URL"),
         http_client=_app.ctx.http_session,
     )
 
@@ -334,7 +334,7 @@ async def server_init(_app, loop):
     """
     Initializes global configs.
     """
-    _app.ctx.backend = os.getenv["BACKEND"].upper()
+    _app.ctx.backend = os.getenv("BACKEND").upper()
     # if _app.ctx.backend == "LEPTON":
     #     from leptonai import Client
 
@@ -345,33 +345,33 @@ async def server_init(_app, loop):
     #         timeout=httpx.Timeout(connect=10, read=120, write=120, pool=10),
     #     )
     if _app.ctx.backend == "BING":
-        _app.ctx.search_api_key = os.getenv["BING_SEARCH_V7_SUBSCRIPTION_KEY"]
+        _app.ctx.search_api_key = os.getenv("BING_SEARCH_V7_SUBSCRIPTION_KEY")
         _app.ctx.search_function = lambda query: search_with_bing(
             query,
             _app.ctx.search_api_key,
         )
     elif _app.ctx.backend == "GOOGLE":
-        _app.ctx.search_api_key = os.getenv["GOOGLE_SEARCH_API_KEY"]
+        _app.ctx.search_api_key = os.getenv("GOOGLE_SEARCH_API_KEY")
         _app.ctx.search_function = lambda query: search_with_google(
             query,
             _app.ctx.search_api_key,
-            os.getenv["GOOGLE_SEARCH_CX"],
+            os.getenv("GOOGLE_SEARCH_CX"),
         )
     elif _app.ctx.backend == "SERPER":
-        _app.ctx.search_api_key = os.getenv["SERPER_SEARCH_API_KEY"]
+        _app.ctx.search_api_key = os.getenv("SERPER_SEARCH_API_KEY")
         _app.ctx.search_function = lambda query: search_with_serper(
             query,
             _app.ctx.search_api_key,
         )
     elif _app.ctx.backend == "SEARCHAPI":
-        _app.ctx.search_api_key = os.getenv["SEARCHAPI_API_KEY"]
+        _app.ctx.search_api_key = os.getenv("SEARCHAPI_API_KEY")
         _app.ctx.search_function = lambda query: search_with_searchapi(
             query,
             _app.ctx.search_api_key,
         )
     else:
         raise RuntimeError("Backend must be BING, GOOGLE, SERPER or SEARCHAPI.")
-    _app.ctx.model = os.getenv["LLM_MODEL"]
+    _app.ctx.model = os.getenv("LLM_MODEL")
     _app.ctx.handler_max_concurrency = 16
     # An executor to carry out async tasks, such as uploading to KV.
     _app.ctx.executor = concurrent.futures.ThreadPoolExecutor(
@@ -382,7 +382,7 @@ async def server_init(_app, loop):
     _app.ctx.kv = KVWrapper(os.getenv("KV_NAME") or "search.db")
     # whether we should generate related questions.
     _app.ctx.should_do_related_questions = bool(
-        os.getenv["RELATED_QUESTIONS"] in ("1", "yes", "true")
+        os.getenv("RELATED_QUESTIONS") in ("1", "yes", "true")
     )
     # Create httpx Session
     _app.ctx.http_session = httpx.AsyncClient(