URL/URI rewrite without changing in Client browser

I'd maybe argue that partitions aren't create separate logical BIG-IPs. It's more about building separate administrative domains on a single BIG-IP. Further, partitions can always access the /Common partition. To answer your question though, it depends on the level of isolation, but you should simply be able to point to the VIP in the oter partition,

virtual "/abc-app-dev/np-api-vip"

or 

virtual "/Common/abc-app-dev/np-api-vip"

You don't need SNAT to communicate between VIPs on the same BIG-IP.

Hi Kevin,

Thanks for your guidance. Here is what I figured out and it is working now. All happened due to your idea so thanks again.

IRule for same routing domain :-

when HTTP_REQUEST {
log local0. "Incoming request: [HTTP::host]:[HTTP::uri]"
if { [set match [class match -value -- "[HTTP::host]:[HTTP::uri]" starts_with datagroup_Name]] ne "" } {
log local0. "Datagroup match: $match"
## Get first URI path in client request
set FIRSTPATH [getfield [HTTP::path] "/" 2]

## Split match into host and path
set matchlist [split $match ":"]
set MATCHHOST [lindex $matchlist 0]
set MATCHPATH [lindex $matchlist 1]

## Replace FIRSTPATH with MATCHPATH (from full HTTP::uri)
set UPDATEDPATH [string map [list "/$FIRSTPATH" "$MATCHPATH"] [HTTP::uri]]
log local0. "Updated host: $MATCHHOST"
log local0. "Updated path: $UPDATEDPATH"

HTTP::host $MATCHHOST
HTTP::uri $UPDATEDPATH

virtual "/path/virtual_server_name"


}
}

For different route domain 

when HTTP_REQUEST {
log local0. "Incoming request: [HTTP::host]:[HTTP::uri]"
if { [set match [class match -value -- "[HTTP::host]:[HTTP::uri]" starts_with datagroup_name]] ne "" } {
log local0. "Datagroup match: $match"
## Get first URI path in client request
set FIRSTPATH [getfield [HTTP::path] "/" 2]

## Split match into host and path
set matchlist [split $match ":"]
set MATCHHOST [lindex $matchlist 0]
set MATCHPATH [lindex $matchlist 1]

## Replace FIRSTPATH with MATCHPATH (from full HTTP::uri)
set UPDATEDPATH [string map [list "/$FIRSTPATH" "$MATCHPATH"] [HTTP::uri]]
log local0. "Updated host: $MATCHHOST"
log local0. "Updated path: $UPDATEDPATH"

HTTP::host $MATCHHOST
HTTP::uri $UPDATEDPATH

pool pool_name


}
}