Environment variables missing from httpd 2.2 installation

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Greetings!

I've been running Apache web sites for years, but until now had never needed
to reference environment variables inside the configuration files. I'm trying
to set up a load balancing configuration using mod_proxy_balancer under Apache
2.2.3 (stock install under Debian Etch).

My enabled modules are:

 core_module (static)
 log_config_module (static)
 logio_module (static)
 mpm_prefork_module (static)
 http_module (static)
 so_module (static)
 alias_module (shared)
 auth_basic_module (shared)
 authn_file_module (shared)
 authz_default_module (shared)
 authz_groupfile_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 cgi_module (shared)
 dir_module (shared)
 env_module (shared)
 headers_module (shared)
 mime_module (shared)
 negotiation_module (shared)
 php4_module (shared)
 proxy_module (shared)
 proxy_balancer_module (shared)
 proxy_connect_module (shared)
 proxy_http_module (shared)
 setenvif_module (shared)
 status_module (shared)
 userdir_module (shared)

Here is the failing part of the config file:

<VirtualHost *:8080>
        # Proxy configuration for testing load balancer.
        # S. Courtney, Sine Nomine Associates, 2007-09-24
        # For documentation see http://httpd.apache.org/docs/2.2/mod/mod_proxy.html
        # and http://issues.apache.org/bugzilla/show_bug.cgi?id=43433
        ServerName myapp.sinenomine.net
        ProxyRequests off
        LogLevel debug
        ErrorLog /var/log/apache2/debug.log
        <Proxy balancer://etr_cluster>
                # This sets a cookie telling which server should have affinity for this client.
                # Requires mod_headers to be loaded.
                # Header always add Set-Cookie "MYAPP=MYAPP.%{BALANCER_WORKER_ROUTE}e; path=/;" env=BALANCER_ROUTE_CHANGED
                Header always add Set-Cookie "MYAPP=MYAPP.%{BALANCER_WORKER_ROUTE}e; path=/;"
                Header always add X-Myapp-Balancer "%{BALANCER_WORKER_NAME}e;"
                Header always add X-Server-Addr "%{SERVER_ADDR}e"
                BalancerMember http://192.168.201.121:28080 smax=5 max=20 loadfactor=10 route=etr01
                BalancerMember http://192.168.201.121:38080 smax=5 max=20 loadfactor=10 route=etr02
                Order deny,allow
                Deny from all
                Allow from all
        </Proxy>
        # Uncomment the following line to enable session affinity, required for reports to work
        # Note that we _do_ allow failover, realizing that it will not work for report downloads
        # in progress. We accept a small limitation for a large gain in functionality.
        # The stickysession parameter relies on the cookie set in the balancer declaration above.
        ProxyPass / balancer://etr_cluster/ nofailover=On stickysession=myapp
        # Uncomment the following line to disable session affinity
        # ProxyPass / balancer://etr_cluster/ nofailover=off
        # These lines prevent the users from seeing the canonical host in redirections.
        # CAUTION: The trailing slash is significant!
        ProxyPassReverse / balancer://etr_cluster/
        ProxyPassReverse / http://192.168.201.121:28080/
        ProxyPassReverse / http://192.168.201.121:38080/
        ProxyPassReverseCookieDomain    192.168.201.121   myapp.sinenomine.net
</VirtualHost>

The line "Header always add X-Server-Addr "%{SERVER_ADDR}e"" is just for testing.

The basis for this configuration is from
   http://issues.apache.org/bugzilla/show_bug.cgi?id=43433

When I run this, everything works fine with no errors in the log, except that
all the environment variables are replaced with "(null)" in the I/O to the
browser.

I feel I must be overlooking something obvious...anyone see what I'm doing
wrong?

Kind regards, and thanks,

Scott

-- 
-----------------------------------------------------------------------------
Scott D. COURTNEY, Principal Engineer                  Sine Nomine Associates
scourtney@xxxxxxxxxxxxxx                           http://www.sinenomine.net/

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