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Description of problem:

The documentation for mod_log_debug (in httpd-manual package) contains four examples one of which is syntactically incorrect and prevents Apache from starting. It uses the following configuration:

<Location "/foo/">
  LogMessage "subrequest to /foo/" hook=type_checker expr=%{IS_SUBREQ}
</Location>

This is how Apache reacts:

# systemctl start httpd
Job for httpd.service failed because the control process exited with error code. See "systemctl status httpd.service" and "journalctl -xe" for details.
# journalctl -xe
...
httpd[2603]: AH00526: Syntax error on line 8 of /etc/httpd/conf.d/custom.conf:
httpd[2603]: Could not parse expression '%{IS_SUBREQ}': syntax error, unexpected $end
...

This is probably a documentation bug, one easily fixable by the following modification which I believe does the desired job (I am no expert at this matter, though):

  LogMessage "subrequest to /foo/" hook=type_checker "expr=-T %{IS_SUBREQ}"
                                                     ^     ^^^            ^

Version-Release number of selected component (if applicable):
httpd-manual-2.4.6-31.el7_1.1.x86_64

Thanks, fixed upstream: http://svn.apache.org/r1723522.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHEA-2016-2534.html