bugfixes for custom error pages (wrong check --> wrong return value), SSI tag extraction (quoted value) and connection write error checking during HTTP error page production.
bugfixes for custom error pages (wrong check --> wrong return value), SSI tag extraction (quoted value) and connection write error checking during HTTP error page production.

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