HTTP_REQUEST and HTTP::redirect and HTTP::respond with if condition and source IP

A few things to point out:

1. You don't need to set the src_client_ip variable because you're only evaluating it once. The added variable just adds memory consumption. Truthfully, since you're only evaluating the path 3 times, you could probably also skip setting the path variable as well.

2. Is the %1701 a route domain identifier?

3. In each of your conditions, you HTTP::redirect and HTTP::respond commands. The HTTP::redirect command issues a 302 response to the client with a Location header. The HTTP::response command, in this case, responds to the client with a 200 and some HTML content. These two commands are contradictory. If it works at all, it's certainly an anomaly.

4. I would add some logging to the top of your iRule to see what the path actually is. The fact that the "/use1/" condition isn't catching would most likely indicate that the path is never "/use1/".

Here's a new version of your iRule. I made some assumptions about what you wanted to do in the conditions where you had a redirect and a respond.

when HTTP_REQUEST {
    log local0. "Client ([IP::client_addr]) is requesting: [HTTP::path]"

    if { [IP::addr [IP::client_addr] equals 176.202.126.81%1701] } {
        log local0. "Client IP match"
        switch -glob [string tolower [HTTP::path]] {
            "/use1/*" {
                log local0. "Catch /use1/ - redirecting"
                HTTP::redirect "https://ecr.host.com.qa/use/" 
            }
            "/use/*" {
                log local0. "Catch /use/"
                HTTP::respond 200 content "IP is $src_client_ip and /use/" "Content-Type" "text/xml"
            }
            "/oncfo1/*" {
                log local0. "Catch /oncf1/ - redirecting"
                HTTP::redirect "https://ecr.host.com.qa/oncfo/" 
            }
            "/oncfo/*" {
                log local0. "Catch /oncfo"
                HTTP::respond 200 content "IP is $src_client_ip and /oncfo/" "Content-Type" "text/xml" 
            }
            "/oncres1/*" {
                log local0. "Catch /oncres1/ - redirecting"
                HTTP::redirect "https://ecr.host.com.qa/oncres/"
            }
            "/oncres/*" {
                log local0. "Catch /oncres/"
                HTTP::respond 200 content "IP is $src_client_ip and /oncres/" "Content-Type" "text/xml" 
            }
            default {
                log local0. "Default condition"
                HTTP::respond 200 content "IP is $src_client_ip and check it" "Content-Type" "text/xml" 
            }
        }
    } else {
        log local0. "Client IP doesn't match"
        HTTP::respond 200 content "IP is $src_client_ip and check it" "Content-Type" "text/xml" 
    }
}