Limit Apache proxying to specific env config

This change limits when Apache will proxy pass to the application to when the CFGOV_APPLICATION_HOST env var is set.

cfgov/apache/conf.d/proxy.conf

@@ -0,0 +1,11 @@
+# This file is only used when running Apache and the application
+# containerized. This configures Apache to ProxyPass to the application
+# container when CFGOV_APPLICATION_HOST is defined in the environment.
+#
+# TODO: Remove the RewriteCond and switch to a simple ProxyPass when the
+# application is moved to Gunicorn.
+ServerName https://www.consumerfinance.gov
+
+RewriteCond expr "-n env('CFGOV_APPLICATION_HOST')"
+RewriteRule ^/(.*)$ http://${CFGOV_APPLICATION_HOST}:8000/$1 [P,L]
+ProxyPassReverse / http://${CFGOV_APPLICATION_HOST}:8000/

cfgov/apache/conf.d/wsgi.conf.venv

@@ -1,3 +1,7 @@
+# Our classic mod_wsgi deployment will move this file into place if we're
+# expecting to use mod_wsgi.
+# TODO: Remove when the application is containerized or moved to Gunicorn
+
 ServerName https://www.consumerfinance.gov
 
 LoadModule wsgi_module modules/mod_${SCL_PYTHON_VERSION}-wsgi.so

cfgov/apache/conf/httpd.conf

@@ -80,12 +80,6 @@ Include conf.modules.d/*.conf
 # User/Group: The name (or #number) of the user/group to run httpd as.
 # It is usually good practice to create a dedicated user and group for
 # running httpd, as with most system services.
-
-# Default these values to apache/apache if the APACHE_USER and APACHE_GROUP
-# env vars are not provided.
-# TODO: Remove when Apache is containerized
-SetEnvIfExpr "-n env('APACHE_USER')" APACHE_USER=apache
-SetEnvIfExpr "-n env('APACHE_GROUP')" APACHE_GROUP=apache
 User ${APACHE_USER}
 Group ${APACHE_GROUP}