Will this irule work okay to "Patch" a messed up web application

[root@iris:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.17.33:http
   ip protocol tcp
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@iris:Active] config  b pool foo list
pool foo {
   members {
      74.125.235.48:http {}
      172.28.17.22:http {}
   }
}
[root@iris:Active] config  b rule myrule list
rule myrule {
   when CLIENT_ACCEPTED {
        set def_pool [LB::server pool]
        set retries 0
}

when HTTP_REQUEST {
        set request_headers [HTTP::request]
        log local0. "$request_headers"
}

when LB_SELECTED {
        log local0. "[LB::server addr]"
}

when HTTP_RESPONSE {
        log local0. "[IP::server_addr]:[TCP::server_port] [HTTP::status]"
        if {[HTTP::status] starts_with "5"} {
                incr retries
                log local0. "5xx error caught: retry $retries out of [active_members [LB::server pool]]"
                if { $retries < [active_members $def_pool] } {
                        HTTP::retry $request_headers
                }
        }
}
}

[root@iris:Active] config  curl -I http://172.28.17.22
HTTP/1.0 500 Internal Server Error
Server: BigIP
Connection: Keep-Alive
Content-Length: 0

[root@iris:Active] config  curl -I http://172.28.17.33
HTTP/1.1 200 OK
Date: Sat, 05 Nov 2011 01:32:05 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Transfer-Encoding: chunked

[root@iris:Active] config  tail -f /var/log/ltm
Nov  5 09:29:22 local/tmm info tmm[1609]: Rule myrule : HEAD / 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  Host: 172.28.17.33  Accept: */*
Nov  5 09:29:22 local/tmm info tmm[1609]: Rule myrule : 172.28.17.22
Nov  5 09:29:22 local/tmm info tmm[1609]: Rule myrule : 172.28.17.22:80 500
Nov  5 09:29:22 local/tmm info tmm[1609]: Rule myrule : 5xx error caught: retry 1 out of 2
Nov  5 09:29:22 local/tmm info tmm[1609]: Rule myrule : HEAD / 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  Host: 172.28.17.33  Accept: */*
Nov  5 09:29:22 local/tmm info tmm[1609]: Rule myrule : 74.125.235.48
Nov  5 09:29:22 local/tmm info tmm[1609]: Rule myrule : 74.125.235.48:80 200