Rewrite the post operation with a body.

Hi Hien_Truong, it looks like you just need to rewrite the host header inbound? If you want this to be fairly dumb, you can do something like:

when HTTP_REQUEST {
  if { [HTTP::host] == "abc-cd.ef.com" } {
    HTTP::header replace Host "cd.ef.com"
  }
}

If it needs to be dynamic, there are multiple options depending on what the patterns would be. I'll assume a pattern of: nnn-cd.ef.com for the following solution:

when HTTP_REQUEST {
  # assumes that port 80 is used for http or 443 for https
  # if non-std ports, use contains instead of ends_with
  if { [HTTP::host] ends_with "-cd.ef.com" } {
    HTTP::header replace Host [getfield [HTTP::host] "-" 2]
  }
}

If this is not the actual pattern of your hosts that you want to manipulate, post back and we can work on an alternative. untested, make sure to do so in a lab.