irule redirection

I have the below VIP, pool and some alternative irule to successful my goal.

İncoming requests to http://xyz.com.tr/httpgw (10.x.x.199) distrubutes to the pool httpgw-8086-pool but the URI need to change as 10.x.x.257:8086/httpgw when the requests disturubuted the pool httpgw-8086-pool. I have wrote the below irulus to accomplish my goal but is did not work.so what kind of change I need to perform on the irule to accomplish my goal. Thank you.

pool httpgw-8086-pool {

monitor all tcp

members {

10.x.x.157:8086 {}

10.x.x.158:8086 {

session user disabled

}

}

rule httpgw-irule {

when HTTP_REQUEST {

if { [string tolower [HTTP::uri]] equals "/" } {

HTTP::uri [string map -nocase {"/" "/httpgw"} [HTTP::uri]]

}

}

}

rule httpgw-irule-alternate {

when HTTP_REQUEST {

if { [HTTP::uri] equals "/" } {

set newuri "/httpgw"

log "Incoming uri - [HTTP::uri] being translated to $newuri"

HTTP::uri $newuri

}

}

}

rule httpgw-redirection {

when HTTP_REQUEST {

if { (([HTTP::host] equals "xyz.com.tr") and ([HTTP::uri] equals "/")) } {

HTTP::redirect " http://xyz.com.tr/httpgw "

}

}

}

virtual httpgw-8086-VIP {

pool httpgw-8086-pool

destination 10.x.x.199:http

ip protocol tcp

rules httpgw-irule-alternate

persist source_addr

profiles {

http {}

tcp-lan-optimized {

clientside

}

tcp-wan-optimized {

serverside

}

}

}