Update src/rag_engine.py

src/rag_engine.py

@@ -20,15 +20,22 @@ class ProjectRAGEngine:
 
         # ✅ OpenRouter LLM (Chat only)
         self.llm = ChatOpenAI(
-            model="openai/gpt-oss-120b:free",
-            temperature=0,
-            openai_api_key=os.getenv("OPENROUTER_API_KEY"),
-            openai_api_base="https://openrouter.ai/api/v1",
-            default_headers={
-                "HTTP-Referer": "http://localhost:8501",
-                "X-Title": "Project-RAG-App"
-            }
-        )
+        model="openai/gpt-oss-120b:free",
+        temperature=0,
+    
+        # ✅ CORRECT PARAM
+        api_key=os.getenv("OPENROUTER_API_KEY"),
+    
+        # ✅ OpenRouter endpoint
+        base_url="https://openrouter.ai/api/v1",
+    
+        # ✅ REQUIRED HEADERS FOR OPENROUTER
+        default_headers={
+            "Authorization": f"Bearer {os.getenv('OPENROUTER_API_KEY')}",
+            "HTTP-Referer": "http://localhost:8501",
+            "X-Title": "Project-RAG-App"
+        })
+
 
         self.vector_store = None