Need to redirect a specific URL to a particular node in a pool

I hope your abc.com is resolving to 1.1.1.1 VIP. And you want the traffic to be forwarded to a particular pool member if its starting with URI - /APICherwell, You dint say what the pool of the pool member is, hoping its 443, try the below. Where pool_name is the default pool consisting all the pool members. Map the below to the 1.1.1.1:443 VIP and test it.

when HTTP_REQUEST {
  if { [HTTP::uri] starts_with "/APICherwell" } {
    node 2.2.2.3 443
    log local0. "APICherwell uri traffic has come, specific pool member selected"
  } else {
    pool pool_name
  }
}

You can also use -

pool pool_name member 2.2.2.3 443