Intermittent "'www-browser --dump http://localhost:80/server-status' failed" errors generated by "apachectl status"

[Steve Dondley <s@xxxxxxxxxxxxxxxxxxxxxxx>]

I have a script, triggered by cron, that runs every minute that checks 
the status of the localhost's server:

my $status = `sudo apachectl status 2>&1`;

After a freshly restarted apaceh2 daemon, the script works fine and the 
contents of $status get written to a file.

But after several minutes or several hours of humming along, a "failed" 
error message will start creeping into the bottom of the apachectl 
status reports along with suggestions for editing the APACHE_LYNX 
variable:


=============================================================================

               Apache Server Status for localhost (via 127.0.0.1)

   Server Version: Apache/2.4.38 (Debian) OpenSSL/1.1.1d
   Server MPM: prefork
   Server Built: 2020-08-25T20:08:29
     __________________________________________________________________

<snip>

W____._._.___...................................................
................................................................
......................

   Scoreboard Key:
   "_" Waiting for Connection, "S" Starting up, "R" Reading Request,
   "W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
   "C" Closing connection, "L" Logging, "G" Gracefully finishing,
   "I" Idle cleanup of worker, "." Open slot with no current process
'www-browser --dump http://localhost:80/server-status' failed.
Maybe you need to install a package providing www-browser or you
need to adjust the APACHE_LYNX variable in /etc/apache2/envvars

=============================================================================

After a few minutes, the error might go away only to come back stronger, 
fiercer and longer a few hours, or minutes, later. There doesn't seem to 
be any rhyme or reason to when this error occurs except that when they 
do happen, they tend to occur in bursts. Other than that the status 
reports are generated perfectly fine except for the error message at the 
end of them. The error will also sometimes show up sometimes, but not 
always, when "apachectl status" is run directly on the command line.

I've got this line in /etc/apache2/envvars: export 
APACHE_LYNX='www-browser --dump'

I've tried using the command with "-dump" and "--dump" but it doesn't 
seem to make a difference.

Any ideas on what might be causing this error to be generated?

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