add post buffering
Add 'post-buffering' in uwsgi option to prevent following error:
Connection reset by peer [plugins/http/http.c line 917] Tue Jan 21 10:00:19 2020 - uwsgi_response_write_body_do(): Connection reset by peer [core/writer.c line 429] during GET /datasets/1d1dbe75827398cd/display?to_ext=sam (192.168.16.204) IOError: write error