SW-658: Change StringIO to BytesIO for raewebservice

LCS/PyCommon/flask_utils.py

@@ -20,7 +20,7 @@
 # $Id$
 
 from flask import after_this_request, request
-from io import StringIO as IO
+from io import BytesIO as IO
 import gzip
 import functools
 from datetime import datetime