/usr/share/ipa/ipa-httpd.conf.template is in freeipa-server 4.7.0~pre1+git20180411-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # Do not edit. Created by IPA installer.
[Service]
Environment=KRB5CCNAME=$KRB5CC_HTTPD
Environment=GSS_USE_PROXY=yes
Environment=KDCPROXY_CONFIG=$KDCPROXY_CONFIG
Environment=LC_ALL=C.UTF-8
ExecStartPre=$IPA_HTTPD_KDCPROXY
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