Do not use 8081 for the checker

[sebz]

Spend some time to find how to configure haproxy to have something like:

                          -->  HTTPS     HTTP
                          |       |        |
                          |       v        v
                   -------|----[:443]----[:80]--------
           ELB    |       |       |        |          |
                  |       |       |_     _ |          |
                  |       |         |  |              |
                  |       |         |  |              |
                  |-------|---------|--|--------------|
                          |         v  v
                   -------|--------[:8080]------------
                  |       |           |               |
            EC2   |        --- No - HTTPS             |
                  |                   or              |
                  |               HTTP /check ?       | 
                  |                   |               |
                  |                frontend           |
                  |                   |               |
                  |                [:3000]            |
                  |                backend            |
                  |___________________________________|