Test fix for #557
Test fix for #557

According to hint from nfrmtk, see
https://github.com/civetweb/civetweb/issues/557#issuecomment-348478042

GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver,GerHobbelt/civet-webserver