It's a Server Side Include (SSI) documents test

#include file: The site is under construction

The site is under construction

#include virtual:
[an error occurred while processing this directive]

#echo var:
DOCUMENT_URI=/test.shtml

#config timefmt:
Last Modified=16:05, August 17, 2018

#set var:
test_var=test_value

#if expr (apache 2.2 format):
[an error occurred while processing this directive] Add "SSILegacyExprParser on" to .htaccess

#if expr (apache 2.4+ format):
OK