HAproxy config to balance reads and writes in a Neo4j cluster (2 nodes, one arbiter)

haproxy.cfg

global
    log         127.0.0.1 local2

    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    user        haproxy
    group       haproxy
    daemon

    stats socket /var/lib/haproxy/stats

defaults
    mode                    http
    log                     global

    option                  httplog
    option                  dontlognull
    option forwardfor       except 127.0.0.0/8
    option                  redispatch

    maxconn                 256
    retries                 3

    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms

frontend neo4j
    bind *:7474

    acl elb_check url_beg /db/manage/server/ha/available
    acl no_slaves nbsrv(neo4j-slaves) eq 0
    acl master_methods method POST DELETE PUT
    acl slave_methods method GET

    use_backend neo4j-nodes if elb_check
    use_backend neo4j-masters if master_methods
    use_backend neo4j-masters if no_slaves
    use_backend neo4j-slaves if slave_methods

    default_backend neo4j-nodes

backend neo4j-masters
    balance first
    option httpchk GET /db/manage/server/ha/master

    server neo4j-1 neo4j-1:7474 maxconn 32 check
    server neo4j-2 neo4j-2:7474 maxconn 32 check

backend neo4j-slaves
    balance first
    option httpchk GET /db/manage/server/ha/slave

    server neo4j-1 neo4j-1:7474 maxconn 32 check
    server neo4j-2 neo4j-2:7474 maxconn 32 check

backend neo4j-nodes
    balance roundrobin
    option httpchk GET /db/manage/server/ha/available

    server neo4j-1 neo4j-1:7474 maxconn 32 check
    server neo4j-2 neo4j-2:7474 maxconn 32 check