Configuring HAProxy 1.5.x to add Basic Auth and Health Check

gistfile1.txt

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#1. Add an ACL for the top level routes you need to proxy
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  acl routes_to_proxy path_beg -i /my/path /other-path
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#2. Associate the routes with a backend
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  use_backend my_backend if routes_to_proxy
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#3. Create a list of credentials (note: passwords are in clear text. this is bad security practice.)    
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  userlist UsersFor_MyApp
  user myuser insecure-password mypassword
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#4. Set up the backend as usual... this one has an optional health check defined (e.g. for a Spring Boot App https://goo.gl/u5KtaO)
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  backend my_backend
    balance roundrobin
    option httpchk GET /health
    http-check expect status 200
    server myhost01 myhost01:8080 check port 8081 inter 60000 rise 3 fall 3
    server myhost02 myhost01:8080 check port 8081 inter 60000 rise 3 fall 3
    acl AuthOkay_MyApp http_auth(UsersFor_MyApp)
    http-request auth realm MyAppRealm if !AuthOkay_MyApp