Improve request handling and error checking for OAuth token

app.py

@@ -724,21 +724,21 @@ def create_interface(initial_bot: RAGBot) -> gr.Blocks:
                 token = None
                 
                 # Try to get token from request (OAuth token from logged-in user)
-                if request:
-                    try:
+                try:
+                    if request is not None:
                         # Check if request has client with hf_token attribute
-                        if hasattr(request, 'client') and request.client:
+                        if hasattr(request, 'client') and request.client is not None:
                             if hasattr(request.client, 'hf_token') and request.client.hf_token:
                                 token = request.client.hf_token
                             elif hasattr(request.client, 'token') and request.client.token:
                                 token = request.client.token
                         # Also check request headers
-                        if not token and hasattr(request, 'headers'):
+                        if not token and hasattr(request, 'headers') and request.headers:
                             auth_header = request.headers.get('authorization', '') or request.headers.get('Authorization', '')
-                            if auth_header.startswith('Bearer '):
+                            if auth_header and auth_header.startswith('Bearer '):
                                 token = auth_header[7:]
-                    except Exception as e:
-                        logger.debug(f"Could not get token from request: {e}")
+                except Exception as e:
+                    logger.debug(f"Could not get token from request: {e}")
                 
                 # Fallback to environment variable if OAuth token not available
                 # This allows the app to work even without user login (for public models)
@@ -808,6 +808,7 @@ def create_interface(initial_bot: RAGBot) -> gr.Blocks:
         return demo
     
     logger.info("Gradio interface created successfully")
+    logger.info(f"Demo type: {type(demo)}, Demo ID: {id(demo)}")
     return demo
 
 
@@ -938,6 +939,12 @@ elif not isinstance(demo, (gr.Blocks, gr.Interface)):
         gr.Markdown(f"# Error: Invalid demo type\n\nDemo type: {type(demo)}\n\nPlease check the logs for details.")
 else:
     logger.info(f"✅ Final demo check passed: demo type={type(demo)}")
+    # Explicitly ensure demo is accessible for Spaces
+    if IS_SPACES:
+        logger.info(f"Spaces mode: Demo is ready and accessible")
+        # Print confirmation for debugging
+        print(f"DEMO_READY: {type(demo)}")
+        print(f"DEMO_VALID: {isinstance(demo, (gr.Blocks, gr.Interface))}")
 
 # For local execution only (not on Spaces)
 if __name__ == "__main__":