I have install on a Debian 9 a qgis-server, python-qgis, apache2 and libapache2-mod-fcgid. Apache service is runnning.
I have a folder uder
usr/lib/cgi-bin/ but when I request
I have edited the conf file to enable fcgi.
Everything works on qgis-server 2.14 but not on qgis-server 3.