iRule to modify http response

Question

Hello all, 
Seeking some assistance with modifying a http response from a server back to a client.
Senario is as follows (All web traffic)
VS_A answers on 443 and sends to pool members on 9999VS_B answers on 888 and sends to same pool members on 7777When browsing to VS_B, there is a function that is on the site that responds with the public url of VS_A (ex https://www.acme.com:9999) instead of https://www.acme.com and hence causes a timeout because the clients are not able to access that port directly.
I am seeking to remove the port but keep all uri information.
Additionaly
Do I need any specific settings for the VS in order for this to work?
I have http-wxff profile I have sslclient profile I have sslserver profile
am I missing anything obvious?
Update....... I am trying  below
I am attempting to modify a server response back to the client. I am attempting to remove the port from the url the client receives while still perserving the case and uri information. 
When attempting this I notice no 302 response (Using firefox) and no location information. Seeking help to get this sorted.
when HTTP_REQUEST {
     Disable the stream filter for requests
    STREAM::disable
 Remove this header to prevent server from compression response
HTTP::header remove Accept-Encoding

}
when HTTP_RESPONSE {
    set internal_host "xxx.yyy.com" 
    set external_host "boy.girl.com"
      Rewrite the Location header for redirects 
    if { [HTTP::header exists Location] }{ 
        HTTP::header replace Location [string map "$internal_host $external_host" [HTTP::header Location]] 
    } 
 Rewrite the response content using a stream profile if it is text 
if { [HTTP::header Content-Type] contains "text" } {

Set the stream expression with the find/replace strings 
    STREAM::expression "@$internal_host@$external_host@"

Enable the stream filter 
    STREAM::enable 
}

}

jg · Answer

"there is a function that is on the site that responds with the public url of VS_A"
Was this in the form of an HTTP redirect?

pedro_haoa · Answer

Hi,&nbsp;
Try this iRule:&nbsp;
when HTTP_RESPONSE {
   if { [HTTP::status] equals "302" &amp;&amp; [HTTP::header Location] contains ":9999/" } {
HTTP::header replace Location [string map {":9999/" ""} [HTTP::header Location]]
   }
}&nbsp;
I hope it helps.&nbsp;
Cheers!&nbsp;

robinsonja_2717 · Answer

There is an option that when selection responds with the location on another url on a specific port.&nbsp;

jg · Answer

If it is an HTTP redirect, you can edit your HTTP profile and select "All" for "Redirect Rewrite".&nbsp;

jg · Answer

Try this one then:
when HTTP_RESPONSE {
    if { [HTTP::header exists "Location"] } {
        log local0. "Original Location: [HTTP::header Location]"                                            
        set new_location [string map {"www.acme.com:9999" "www.acme.com:888"} [HTTP::header value Location]] 
        HTTP::header replace Location $new_location
    }
}

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iRule to modify http response

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