use StringIO for single mock requests as well
use StringIO for single mock requests as well

drnextgis/mapproxy,vrsource/mapproxy,faegi/mapproxy,olt/mapproxy,mapproxy/mapproxy,kaiCu/mapproxy,procrastinatio/mapproxy,kaiCu/mapproxy,geoadmin/mapproxy,geoadmin/mapproxy,olt/mapproxy,vrsource/mapproxy,camptocamp/mapproxy,mapproxy/mapproxy,faegi/mapproxy,camptocamp/mapproxy,drnextgis/mapproxy,procrastinatio/mapproxy