Why am I receiving a "HAProxy Server not available" status?

Background Information

You receive a server not available status message for your HAProxy server even though it is running and operational.

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Answer

Warning: If you want HAProxy to perform health checks on your web site, remember to include the health-check file in your application bundle. If you do not do this, you will receive errors similar to the following in your log file:  

"GET /health_check.jsp HTTP/1.0" 404 1003 "-" "-"

For more information on this, please see the Health Check Page.

When this is configured correctly, your HTTP access logs should report output similar to:

"GET /health_check.jsp HTTP/1.0" 200 338 "-" "-"