Haproxy 1.5.14 with OracleHTTPServer(OHS)

Hi
We have a problem working with HAproxy as http balancer for OracleHTTPServers and BI servers as application servers.
End user cannot download huge file.

  1. First end user start export huge file.
  2. BI say OK download complete but
  3. Download file incomplete just like network error appear.
    I cannot understand where exactly problem is. I try without balancer directly to OHS-OK.
    I try come directly to BI servers-OK.

my config is
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 4096
frontend main *:80:
default_backend app
backend app
balance roundrobin
cookie JSESSIONID prefix nocache
server bi11g-httpserver2-p 10.17.34.183:7777 check cookie s1
server bi11g-httpserver1-p 10.17.34.182:7777 check cookie s2

I set haproxy in debug mode and trace my download session:
<I cannot attach log :(>

Schem is

Release 1.5.14 is pretty old, with 92 confirmed bugs that are fixed in 1.5.19. I suggest you upgrade the software first of all, chances are this is already long fixed.