Update handler.py

handler.py

@@ -40,6 +40,13 @@ class EndpointHandler():
             except FileNotFoundError:
                 pass
 
-        return {
-            "audio": base64.b64encode(buffer.read()).decode('utf-8')
-        }
+        from flask import Response
+        buffer.seek(0)
+        return Response(
+            buffer.read(),
+            mimetype='audio/wav',
+            headers={
+                'Content-Disposition': 'attachment; filename=output.wav',
+                'Content-Type': 'audio/wav'
+            }
+        )