Update app.py

app.py

@@ -24,7 +24,7 @@ model_2_interface = gr.Interface(
 )
 
 def query(question, context, api_url, headers):
-    if api_url = API_URL:
+    if api_url == API_URL:
       payload = {"question": question, "context": context}
     else:
       paylaod = {"question": "what is the context of the question: "+question+" :"}