tomcat - HAProxy - connection reset during transfer -

i using haproxy in front of 2 webapps deployed in tomcat. when testing high availability, made 10000 requests , @ point kill 1 of tomcat instances. 1 or 2 requests errors. request sent using spring's resttemplate. here exception: "org.springframework.web.client.resourceaccessexception: i/o error on post request "http://:8080/myservice/_doaction":unexpected end of file server; nested exception java.net.socketexception: unexpected end of file server"

the haproxy stats says in "errors" section, "resp" subsection, when hover on number shown there, 2 : "connection resets during transfers:1 client, 2 servers". means?

also, on "warnings" section have "retr":29 , "redis":1. tells me request being redispatched "living" server. assumption correct?

here haproxy.cfg:

 listen tomcat_frontend 
    bind *:8080
   timeout client 5000ms
   timeout server 5000ms
   mode http
   option httpclose
   option httplog
   acl myservice_tomcat path_beg /myservice
   use_backend tomcat_myservice_backend if myservice_tomcat
  backend tomcat_myservice_backend
   option forwardfor
   option redispatch
   retries 30
   server server-2 :8080 check inter 10
   server server-1 :8080 check inter 10
   balance leastconn
   mode http