URL rewrite through iRule

Meanwhile, i want to do that without any redirection, i just want to rewrite the url, thanks all...

Hi this is the code you need in HTTP_REQUEST;-

if {[string tolower [HTTP::Host]] starts_with "www.abc.com" && [HTTP::path] eq "/"} {
    HTTP::header replace Host "partner.abc.com"
    HTTP::uri "/xyz"
}

In addition, you may need to remove the Performance HTTP profile as it only gives you v limited l7 iRule support.

Jo

Hi Joanna, Thanks a lot, I think your solution is almost the same of my first solution, but it's better to check it with yours. Meanwhile, i have one another problem: if i want to use "HTTP::Host" part of script on "Performance (HTTP)" virtual server mode, F5 tells me to use "HTTP Profile", but when i use "Standard" type of virtual server, F5 can not load balances the web traffic. So i should to use "Performance (HTTP)" mode. In this situation, is there any solution to do that through "Performance (HTTP)" mode? Thanks and Regards Joanna...

Hi - Yes you were very close to the correct solution in the first place.

You need to change to "Standard" virtual server and apply an HTTP profile (and a oneconnect profile if you are using layer7 persistence, like 'cookie'). If you have any problems then delete and then recreate the virtual server.

Hi Joanna Thanks a lot for your solution, when i changed the the virtual server type to "Standard" and add "HTTP Profile", it works fine! But now i have another issue: now i want to do URL-rewrite to another port number on another server. For example when clinets want to see "abc.com/ukm", i want to change it to "1.1.1.1:8080/xyz". I've checked it with below script, but i didn't work. Am i wrong?

 if {[string tolower [HTTP::host]] starts_with "abc.com" && [string tolower [HTTP::path]] eq "/ukm"} {

HTTP::header replace Host "1.1.1.1:8080"
HTTP::uri "/xyz"

}

Hi Sunnyman,

No you are not quite right - while it's perfectly valid to include an IP/port number within a Host: header, this does not tell the F5 where to send the traffic. You need to use the node or pool command to inform TMOS where to send traffic. This is the most obvious way using node;-

if {[string tolower [HTTP::host]] starts_with "abc.com" && [string tolower[HTTP::path]] eq "/ukm"} {
    HTTP::header replace Host "partner.abc.com"
    node 1.1.1.1 8080
    HTTP::uri "/xyz"
}

Now having said that, it's not the way I would do it. You should include member 1.1.1.1:8080 in a pool, ie pl_sunnyman_8080 with an appropriate healthcheck and then instruct the F5 to send to the pool;-

if {[string tolower [HTTP::host]] starts_with "abc.com" && [string tolower[HTTP::path]] eq "/ukm"} {
    HTTP::header replace Host "partner.abc.com"
    pool pl_sunnyman_8080
    HTTP::uri "/xyz"
}

The reason this is better is that by having your server in a pool with an appropriate healthcheck, you can have multiple servers in the pool for backup, and also TMOS will already know the state of the servers in the pool, so will only choose one that is UP.

Hi Joanna, Thanks again, certainly your solution is fine in related scenarios, but yet there is one small issue: as i mentioned before, i want to change the url to "1.1.1.1:8080/xyz", meanwhile there is no URL on 1.1.1.1. In fact, the new URL that i want to rewrite or to use is "1.1.1.1:8080/xyz". So, i don't want to use "partner.abc.com" in new Host header, i just want to send traffic to new node pool 1.1.1.1:8080 , but at the end of this address the "/xyz" URI should be inserted and makes "1.1.1.1:8080/xyz".Do you have any other idea about this issue?

So do you really need to change the Host header at all? It has no effect on where the F5 sends the traffic BTW.

when HTTP_REQUEST {
    if {[string tolower [HTTP::host]] starts_with "abc.com" && [string tolower[HTTP::path]] eq "/ukm"} {
         This pool needs to be created with pool member 1.1.1.1:8080
        pool pl_sunnyman_8080
        HTTP::uri "/xyz"
    }
}
when LB_SELECTED {
     This will update the Host header with the IP:port of the selected server
    HTTP::header replace Host "[LB::server addr]:[LB::server port]"
}

This way when you want to add more servers into your pool, the Host header will get rewritten with whatever server got chosen from the pool, but as I said, unless you have a particular reason to rewrite the Host header I wouldn't bother - it has no effect on routing.

Thanks Joanna, i've checked your new solution, but "LB_SELECTED" was not supported. My F5 load-balancer OS version is 10.2.4, but it doesn't support it. Also, i think that the URL i used in L7 is important, because it should be present on destination server, and in my scenario there is no domain name (URL) on the destination server. So, it's important to fill URL with true value. Now, how can i rewrite the URL "http:/abc.com/ukm/" on server 2.2.2.2 , to URL "http://1.1.1.1:8080/xyz/" on server 1.1.1.1 ?

Sunnyman - Event LB_SELECTED definitely works on 10.2.4, however if you have problems just do it the way you originally planned ;-

HTTP::header replace Host "1.1.1.1:8080"
HTTP::uri "/xyz"

but you must add in also a "node " or "pool " command also if you want to send traffic to a pool other than the default.

Joanna