skynet-webportal/docker/nginx/conf.d/include/init-optional-variables

# optional variables initialisation - those variables are used in log_format
# but are not set on every route so we need to initialise them with empty value
# because otherwise logger with throw error

# set only on hns routes
set $hns_domain '';

# set only if server has been access through SERVER_DOMAIN
set $server_alias '';

# expose skylink variable so we can use it in access log
set $skylink '';