Update service_request.py

service_request.py

@@ -122,5 +122,5 @@ def service_request(
     if source_str is not None and len(source_str) > 256:
         return
 
-    res = asyncio.run(async_service_request(src_str, src, tgt, api_key, api_secret))
+    res = asyncio.run(async_service_request(source_str, src, tgt, api_key, api_secret))
     return 16000, res