added http_check to listen and improved docs

README.md

@@ -72,6 +72,7 @@ Set up (the latest version of) [HAProxy](http://www.haproxy.org/) in Ubuntu syst
 * `haproxy_listen.{n}.option`: [optional]: Options to set (e.g. `[dontlog-normal]`)
 * `haproxy_listen.{n}.no_option`: [optional]: Options to set (e.g. `[dontlog-normal]`)
 * `haproxy_listen.{n}.tcp_check`: [optional]: Perform health checks using tcp-check send/expect sequences (e.g. `['expect string +OK\ POP3\ ready']`)
+* `haproxy_listen.{n}.http_check`: [optional]: Make HTTP health checks consider response contents or specific status codes (e.g. `expect status 403`)
 * `haproxy_listen.{n}.timeout`: [optional]: Timeout declarations
 * `haproxy_listen.{n}.timeout.type`: [required]: The type (e.g. `connect`, `client`, `server`)
 * `haproxy_listen.{n}.timeout.timeout`: [required]: The timeout (in in milliseconds by default, but can be in any other unit if the number is suffixed by the unit) (e.g. `5000`, `50000`)
@@ -159,7 +160,7 @@ Set up (the latest version of) [HAProxy](http://www.haproxy.org/) in Ubuntu syst
 * `haproxy_backend.{n}.mode`: [required]: Set the running mode or protocol of the section (e.g. `http`)
 * `haproxy_backend.{n}.balance`: [required]: The load balancing algorithm to be used (e.g. `roundrobin`)
 * `haproxy_backend.{n}.option`: [optional]: Options to set (e.g. `[forwardfor]`)
-* `haproxy_backend.{n}.http_check`: [optional]: Options to set (e.g. `[httpcheck]`)
+* `haproxy_backend.{n}.http_check`: [optional]: Make HTTP health checks consider response contents or specific status codes (e.g. `expect status 403`)
 * `haproxy_backend.{n}.no_option`: [optional]: Options to unset (e.g. `[forceclose]`)
 * `haproxy_backend.{n}.tcp_check`: [optional]: Perform health checks using tcp-check send/expect sequences (e.g. `['expect string +OK\ POP3\ ready']`)
 * `haproxy_backend.{n}.timeout`: [optional]: Timeout declarations

templates/etc/haproxy/listen.cfg.j2

@@ -23,6 +23,10 @@ listen {{ listen.name }}
   maxconn {{ listen.maxconn }}
 {% endif %}
 
+{% if listen.http_check is defined %}
+  http-check {{ listen.http_check }}
+{% endif %}
+
 {% for option in listen.option | default([]) %}
   option {{ option }}
 {% endfor %}