IRule for reverse proxy with http rewrite

i think the irule does exactly what they want but it may have another redirection they do not know.

to prove, the following is my testing. you can see host header and uri are already changed.

to further investigation, you may try tcpdump on bigip and http analyzer tool such as httpfox.

 config

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:80
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 33
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool cbmserver.com
ltm pool cbmserver.com {
    members {
        200.200.200.111:80 {
            address 200.200.200.111
        }
    }
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule qux
ltm rule qux {
    when CLIENT_ACCEPTED {
  set default_pool [LB::server pool]
}
when HTTP_REQUEST {
  switch [string tolower [HTTP::uri]] {
    "/jobs/apply" {
      HTTP::header replace Host newsite.com
      HTTP::uri "/mobileapply/opco/"
      pool cbmserver.com
    }
    "/jobs/apply/resume-thanks" {
      HTTP::header replace Host newsite.com
      HTTP::uri "/mobilethankyou/opco"
      pool cbmserver.com
    }
    "/jobs/privacy" {
      HTTP::header replace Host newsite.com
      HTTP::uri "/mobileprivacy/opco"
      pool cbmserver.com
    }
    "/jobs/terms" {
      HTTP::header replace Host newsite.com
      HTTP::uri "/mobileterms/opco"
      pool cbmserver.com
    }
    default {
      pool $default_pool
    }
  }
}
}

 trace

[root@ve11a:Active:In Sync] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.24.1(42623) <-> 172.28.24.10(80)
1401198587.8124 (0.0029)  C>S
---------------------------------------------------------------
HEAD /jobs/apply HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: www.opco.com

---------------------------------------------------------------

New TCP connection 2: 200.200.200.14(42623) <-> 200.200.200.111(80)
1401198587.8137 (0.0010)  C>S
---------------------------------------------------------------
HEAD /mobileapply/opco/ HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: newsite.com

---------------------------------------------------------------