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HaProxy

vim /etc/haproxy/haproxy.cfg

In the example bellow you will find a acceptable cipher, how to add a cookie session on HA, SSL offloading, 

global
        log 127.0.0.1 local0 warning
        maxconn 10000
        user haproxy
        group haproxy
        daemon
        spread-checks 5
        tune.ssl.default-dh-param 2048
        ssl-default-bind-ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA

defaults
        log     global
        option  dontlognull
        retries 3
        option redispatch
        maxconn 10000
        mode http
        option dontlognull
        option httpclose
        option httpchk
        timeout connect 5000ms
        timeout client 150000ms
        timeout server 30000ms
        timeout check 1000


listen  lb_stats
        bind    {PUBLIC IP}:80
        mode    http
        balance roundrobin
        server  web1 127.0.0.1:80
        stats   uri /
        stats   realm "HAProxy Stats"
        stats   auth admin:FsoqyNpJAYuD

frontend frontend_{PUBLIC IP}_https
       mode            http
       bind            {PUBLIC IP}:443 ssl crt /etc/haproxy/ssl/domain.com.pem no-sslv3
       reqadd X-Forwarded-Proto:\ https
       http-request add-header X-CLIENT-IP %[src]
       option          forwardfor
       default_backend backend_cluster_http_web1_web2

frontend frontend_{PUBLIC IP}_http
       mode            http
       bind            {PUBLIC IP}:80
       reqadd X-Forwarded-Proto:\ https
       http-request add-header X-CLIENT-IP %[src]
       option          forwardfor
       default_backend backend_cluster_http_web1_web2

frontend frontend_www_custom
       mode            http
       bind            {PUBLIC IP}:666
       reqadd X-Forwarded-Proto:\ https
       http-request add-header X-CLIENT-IP %[src]
       option          forwardfor
       default_backend backend_cluster_http_web1_web2

 backend backend_cluster_http_web1_web2
        cookie SERVERID insert indirect nocache
        option httpchk HEAD /
        server  web1 10.1.2.100:80 weight 1 check cookie web1 inter 1000 rise 5 fall 1
        server  web2 10.1.2.101:80 weight 1 check cookie web2 inter 1000 rise 5 fall 1

Enable xforward on httpd.conf

LogFormat "%{X-Forwarded-For}i %h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\ " combine
LogFormat "%{X-Forwarded-For}i %h %l %u %t \"%r\" %s %b \"%{Referer}i\" \"%{User-agent}i\"" combined-forwarded

It is also possible to use the session cookie provided by the backend server.

backend www
        balance roundrobin
        mode http
        cookie PHPSESSID prefix indirect nocache
        server web1 10.1.2.100:80 check cookie web1
        server web2 10.1.2.101:80 check cookie web2

In this example we will intercept the PHP session cookie and add / remove the reference of the backend server.

The prefix keyword allows you to reuse an application cookie and prefix the server identifier,
then delete it in the following queries.

Default name of cookies by type of feeder backend:
Java : JSESSIONID
ASP.Net : ASP.NET_SessionId
ASP : ASPSESSIONID
PHP : PHPSESSID

--
Test config file:
haproxy -c -V -f /etc/haproxy/haproxy.cfg

Doc

https://cbonte.github.io/haproxy-dconv/ 

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