redirect https to other https with condition

I have following iRules, its bind with virtual server

VS_HTTPS

i wants if someone tyle

https://devs.example.com

then it should redirect to

https://dev.example.com

i have tried following but it didn't work.

in DNS dev and devs are both CNAME and they pointing to same F5 VIP

when HTTP_REQUEST {
  if { ([HTTP::host] eq "dev.example.com") or ([HTTP::host] eq "devs.example.com")  } {
     devs -> dev
    HTTP::redirect https://dev.example.com[HTTP::uri]
    pool dev_pool
  } elseif { [HTTP::host] eq "qa.example.com" } {
    pool qa_pool
  }
}

I am getting following error

$ curl -Ik https://devs.vivox.com
HTTP/1.0 302 Found
Location: https://dev.vivox.com/
Server: BigIP
Connection: Keep-Alive
Content-Length: 0