Need help with iRule redirect

I am guessing the "HTTP::header" is a typo and you meant "HTTP::redirect". I will go on that assumption.

You could try something like this:

 
when HTTP_REQUEST {
  if { [HTTP::host] equals "siteA.com" } {
    switch [HTTP::path] {
      "/whole"  { HTTP::redirect "https://www.siteB.com/promotions/biz_tv_0330/735_729.jsp?WT.mc_id=171074" }
      default    { HTTP::redirect  "https://www.siteB.com/promo/biz_tv_..._id=350042" }
    }
  }
  if { {[HTTP::host] equals {www.siteA.com}}{
    HTTP::redirect "https://www.siteBcom/promotions/biz...xid=350042"
  }
}

You could use a switch in place of the 2 "if" statements too but I think this will accomplish what you want.

Richard