accept HTTP respones from sources without content-type
accept HTTP respones from sources without content-type

camptocamp/mapproxy,mapproxy/mapproxy,mapproxy/mapproxy,faegi/mapproxy,Anderson0026/mapproxy,procrastinatio/mapproxy,faegi/mapproxy,vrsource/mapproxy,geoadmin/mapproxy,olt/mapproxy,drnextgis/mapproxy,olt/mapproxy,camptocamp/mapproxy,geoadmin/mapproxy,kaiCu/mapproxy,Anderson0026/mapproxy,drnextgis/mapproxy,vrsource/mapproxy,kaiCu/mapproxy,procrastinatio/mapproxy