ReverseProxy Configuration Error - Need Help

I have now start irule aproximation, this is what i am doing, however it isn't working yet:

when CLIENT_ACCEPTED {

set default_pool [LB::server pool]

} when HTTP_REQUEST {

switch [string tolower [HTTP::uri]] {

    "/consulta_bancolombia" {
        HTTP::uri "/pruebas/consulta_bancolombia/"
        pool pool_sugar_crm_reverseproxy_80
    }

    "/crm_calidad" {
        HTTP::uri "/pruebas/crm_calidad/" 
        pool pool_sugar_crm2_reverseproxy_80
    }
}

}

i think my problem is just something related to syntax, please make comments over my mistakes.