Need help with Irule to redirect based on http path or host header

Here is the irule I have, let me know if it looks correct.

Assign a pool HTTP path matches
 when HTTP_REQUEST {
 if {
 { [string tolower [HTTP::path]] starts_with "/socket.io" } {
    pool pl_vantage-beta_1337
Or if header string matches    
} elseif { { [HTTP::header "Upgrade"] contains "WebSocket" } && { [string tolower  [HTTP::host]] starts_with "ws" }} {
    pool pl_vantage-beta_1337 }
Otherwise use default pool
    default {
        pool pl_vantage-beta_http
    }
}