mod_authnz_external v3.3.3 (July 22, 2019)

• Added METHOD environment variable to retrieve the HTTP request method
  (e.g. GET, HEAD, POST, OPTIONS, etc.). Thanks to Vijay from Google Code.
• Fixed a bug with incorrect parenthesis grouping when checking the result
  of the external process in exec_external(). Thanks to @dcb314.
• Added the "GroupExternalAuthNCheck Off" directive to disable the check
  for a previously authenticated user when using only the group
  authorization module. If you use any user authentication module in the
  same context, this may be undesirable. Thanks to Micah Andersen/BIMI.
• Fix launching external processes on Windows - many programs require the
  %SystemRoot% environment variable to function properly. Thanks to Micah
  Andersen/BIMI.
• First release with Linux, Mac OS X, and Windows Travis-CI builds.

mod_authnz_external v3.3.2 (Jan Wolter - Dec 12, 2013 + minor recent fixes)

v3.3.2 changes:

• Replaced reference to remote_ip field of the connection record with
  useragent_ip, due to the elimination of remote_ip in Apache 2.4.1. Thanks
  to davidsansome and cjwatson for pointing out the need for this.
• Fixed a bug with setting of GROUP environment variable. Thanks to
  ddarbyson for reporting this, and Guoan Hu for posting the fix.
• Added test/test.pipe.php, a PHP version of test/test.pipe contributed
  by Claus Andersen.

minor changes since then:

• Spelling fixes. Thanks to @ka7.
• UNIX signal code is defined to fix Windows build. Thanks to Michal Pokorny.