I have the following configuration, with Varnish acting as a cache between the externally facing endpoint (NGINX) and Apache.

+-------+        +-------+       +------+
| NGINX |  +---> |Varnish| +---> |Apache|
+-------+        +-------+       +------+

I can't get my Apache VirtualHost configuration to match, when I call it from a browser. The configuration for my (single) VirtualHost looks like this:

<VirtualHost *:80>
    ServerName fabrikam.com
    ServerAlias fabrikam.com
    ServerAdmin myemailaddress
    DocumentRoot /var/www/html
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access-mycustomlog.log combined
</VirtualHost>

Here's the Apache version:

root@localhost:/etc/apache2# apache2 -v
Server version: Apache/2.4.7 (Ubuntu)
Server built:   Jan 14 2016 17:45:23

Symptom

When I access https://fabrikam.com, it doesn't give me the root of the /var/www/html folder. Instead, it tries to access the root of /var/www, and because I disabled mod_index, it gives me a HTTP 404 Not Found error.

Any thoughts on how to get this VirtualHost configuration to "match" properly? When I access fabrikam.com, it should go to the /var/www/html folder, instead of /var/www in the apache2.conf file.

EDIT

Here's the output from apachectl -S

root@localhost:/etc/apache2# apachectl -S                                       
VirtualHost configuration:                                                                       
*:80                   fabrikam.com (/etc/apache2/sites-enabled/000-default.conf:1)   
ServerRoot: "/etc/apache2"                                                                    
Main DocumentRoot: "/var/www"                                                        
Main ErrorLog: "/var/log/apache2/error.log"                                      
Mutex default: dir="/var/lock/apache2" mechanism=fcntl               
Mutex mpm-accept: using_defaults                                                       
Mutex watchdog-callback: using_defaults                                            
PidFile: "/var/run/apache2/apache2.pid"                                             
Define: DUMP_VHOSTS                                                                            
Define: DUMP_RUN_CFG                                                                         
User: name="www-data" id=33                                                              
Group: name="www-data" id=33   

NGINX Configuration

### Rewrite non-HTTPS URLs to HTTPS
server {
    listen      80;
    server_name fabrikam.com;
    rewrite     ^   https://$server_name$request_uri?;
}

server {
        listen 443 ssl;

        server_name fabrikam.com;
        ssl_certificate /etc/letsencrypt/live/fabrikam.com/cert.pem;
        ssl_certificate_key /etc/letsencrypt/live/fabrikam.com/privkey.pem;

        location / {
            proxy_pass http://127.0.0.1:6081;
            proxy_set_header X-Real-IP  $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto https;
            proxy_set_header X-Forwarded-Port 443;
            proxy_set_header Host $host;
        }
}