IRule for reverse proxy with http rewrite

Well, technically you cannot perform an HTTP redirect and be transparent to the client. The very nature of an HTTP redirect involves the client. In order to be transparent, and perhaps the only way, is to (reverse) proxy access to that external site through your F5. You would define that external site as either a node or its own pool. Then you could do something like this:

when CLIENT_ACCEPTED {
    set default_pool [LB::server pool]
}
when HTTP_REQUEST {
    switch [string tolower [HTTP::uri]] {
        "/jobs/apply" {
            HTTP::uri "/apply"
            pool newsite-pool
        }
        "/jobs/apply/resume-thanks" {
            HTTP::uri "/thankyou"
            pool newsite-pool
        }
        "/jobs/privacy" {
            HTTP::uri "/privacy"
            pool newsite-pool
        }
        "/jobs/terms" {
            HTTP::uri "/terms"
            pool newsite-pool
        }
        default {
            pool $default_pool
        }
    }
}

You'll probably also want to have a OneConnect profile applied to the VIP.

in addition, you may also have to replace the host header.

HTTP::header replace Host newsite.com

Should I add the Header line at the beginning or end of the other commands?

Should I add the Header line at the beginning or end of the other commands?

It won't matter.

My company has modified the request. This is what they want now.

company site http://www.opco.com/jobs/apply external site http://newsite.com/mobileapply/opco

company site http://www.opco.com//jobs/apply/resume-thanks external site http://newsite.com/mobilethankyou/opco

company site http://www.opco.com/jobs/privacy external site http://newsite.com/mobileprivacy/opco

company site http://www.opco.com/jobs/terms external site http://newsite.com/mobileterms/opco

I modified the irule from above to this:

when CLIENT_ACCEPTED { set default_pool [LB::server pool] } when HTTP_REQUEST { switch [string tolower [HTTP::uri]] { "/jobs/apply" { HTTP::uri "/mobileapply/opco/" pool cbmserver.com } "/jobs/apply/resume-thanks" { HTTP::uri "/mobilethankyou/opco" pool cbmserver.com } "/jobs/privacy" { HTTP::uri "/mobileprivacy/opco" pool cbmserver.com } "/jobs/terms" { HTTP::uri "/mobileterms/opco" pool cbmserver.com } default { pool $default_pool } } }

When I test it, the URI changes to mobileapply/opco instead of staying jobs/apply and doesn't open the page.

When i try to add HTTP::header replace Host newsite.com, i get an error when i click the update button.

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

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

When i type in my test URL, it is switching to the external address in the address bar.

I type: 

http://www.opco.com/jobs/apply

The address bar switches to

http://www.newsite.com/mobileapply/opco

Here is the latest update:

The company wants the user to type:

http://www.opco.com/jobs/apply?postingid=1235213&vendorid=2214&return=https://m.xxxxx.com/Job-Search-Results.aspx?countryName=All&state=0&domain=&keyword=java

it should forward to:

http://www.newsite.com/mobileapply/opco? postingid=1235213&vendorid=2214&return=https://m.xxxxx.com/Job-Search-Results.aspx?countryName=All&state=0&domain=&keyword=java

The user never sees the new site address in the address bar.

This is the current irule that I have.

when CLIENT_ACCEPTED {
    set default_pool [LB::server pool]
}
when HTTP_REQUEST {
    switch [string tolower [HTTP::uri]] {
        "/jobs/apply" {
            HTTP::uri "/mobileapply/opco"
            pool newsite.com
        }
        "/jobs/apply/resume-thanks" {
            HTTP::uri "/mobileapply/opco/thankyou"
            pool newsite.com
        }
        "/jobs/privacy" {
            HTTP::uri "/mobileapply/opco/privacy"
            pool newsite.com
        }
        "/jobs/terms" {
            HTTP::uri "/mobileapply/opco/terms"
            pool newsite.com
        }
        default {
            pool $default_pool
        }
    }
}

Also, if the user just types in http://www.opco.com it should go to our default pool called opco_pool. When i tried to add that to the rule, it kept failing. Should i put the default pool name in this line:

set default_pool [LB::opco_pool]