F5 LTM (VE) - KeepAlive even if real server close connection

bigpipe does not work on my current version, so here is what tmsh command return:

root@(bigip1)(cfg-sync Standalone)(Active)(/Common)(tmos) show running-config ltm virtual MYVIRTUAL 
ltm virtual MYVIRTUAL {
    destination 192.168.0.85:http
    ip-protocol tcp
    mask 255.255.255.255
    pool MYPOOL1
    profiles {
        http { }
        oneconnect { }
        tcp { }
    }
    snat automap
    source-port change
    vlans-disabled
}

root@(bigip1)(cfg-sync Standalone)(Active)(/Common)(tmos) show running-config ltm profile http
ltm profile http http {
    app-service none
    basic-auth-realm none
    encrypt-cookies none
    fallback-host none
    fallback-status-codes none
    header-erase none
    header-insert none
    insert-xforwarded-for enabled
    lws-separator none
    lws-width 80
    max-header-count 64
    max-header-size 32768
    max-requests 0
    oneconnect-transformations enabled
    pipelining enabled
    redirect-rewrite none
    request-chunking preserve
    response-chunking selective
    response-headers-permitted none
    security disabled
    via-request preserve
    via-response preserve
}

root@(bigip1)(cfg-sync Standalone)(Active)(/Common)(tmos) show running-config ltm profile one-connect 
ltm profile one-connect oneconnect {
    app-service none
    idle-timeout-override disabled
    max-age 86400
    max-reuse 1000
    max-size 10000
    source-mask any
}

But what I think is that it should be not possible. The only way to do this should be the loadbalancer to wait for all response content from the server and then add a "Content-length" header. It's quite like the compression profile work, without the compression... But with rechunk technically, it should be possible...?