HTTP:: redirection is not working in iRule

It matches all the conditions in the below irule except http::redirect condition.

what host (fqdn) did you test?

 configuration

[root@ve11a:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when HTTP_REQUEST {
  if { [string tolower [HTTP::host]] equals "x.y.com" } {
    pool x-pool
  } elseif { [string tolower [HTTP::host]] equals "xdev.y.com" } {
    pool xdev-pool
  } elseif { [string tolower [HTTP::host]] equals "xuat.y.com" } {
    pool xuat-pool
  } else {
    HTTP::redirect http://1.1.1.1:65535/
  }
}
}

 test

[root@ve11a:Active:In Sync] config  curl -I http://172.28.24.10 -H "Host: something"
HTTP/1.0 302 Found
Location: http://1.1.1.1:65535/
Server: BigIP
Connection: Keep-Alive
Content-Length: 0