Update app.py

app.py

@@ -201,9 +201,9 @@ def gradio_chat(query, model_label):
             context_str=context_str, query_str=query, metadata_str=metadata_str
         )
 
-        OPENROUTER_API_KEY = os.environ['OPENROUTER_API_KEY']
+        API_KEY = os.environ['API_KEY']
         headers = {
-            "Authorization": f"Bearer {OPENROUTER_API_KEY}",
+            "Authorization": f"Bearer {API_KEY}",
             "Content-Type": "application/json",
             "HTTP-Referer": "<YOUR_SITE_URL>",
             "X-Title": "<YOUR_SITE_NAME>",