iRule Redirect To Specific Pool Member Based On HTTP Header String

Sample iRule with Loggings:
config  tmsh list ltm rule SLOWROLL
ltm rule SLOWROLL {
    when HTTP_REQUEST {
 if { [HTTP::header exists X-SLOWROLL] and [HTTP::header X-SLOWROLL] equals "1" } {
    node 10.29.100.20 80
        set url [HTTP::header Host][HTTP::uri]
        set vip [IP::local_addr]:[TCP::local_port]
        foreach aHeader [HTTP::header names] {
      log local0. "HTTP REQUEST HEADER $aHeader: [HTTP::header value $aHeader]"
                }
        }
}
when HTTP_RESPONSE {
        set client [IP::client_addr]:[TCP::client_port]
        set node [IP::server_addr]:[TCP::server_port]
        set nodeResp [HTTP::status]
        log local0.info "SUMMARY: Client: $client -> VIP name is [virtual name] $vip and URL is $url -> Node: $node with response $nodeResp"
 }
}




Request from a client:
 curl -v -H 'X-SLOWROLL: 1' http://150.29.100.98
* About to connect() to 150.29.100.98 port 80 (0)
*   Trying 150.29.100.98... connected
* Connected to 150.29.100.98 (150.29.100.98) port 80 (0)
> GET / HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 OpenSSL/1.0.1l zlib/1.2.3 libidn/0.6.5
> Host: 150.29.100.98
> Accept: */*
> X-SLOWROLL: 1
>
< HTTP/1.1 200 OK
< Content-Type: text/html
< Last-Modified: Fri, 19 Sep 2014 09:29:52 GMT
< Accept-Ranges: bytes
< ETag: "7bf75a44ecd3cf1:0"
< Server: Microsoft-IIS/7.5
< Date: Tue, 19 Apr 2016 05:32:06 GMT
< Content-Length: 1162


Log output:
Apr 18 15:33:36 MAMA-ATM-SGDC info tmm1[11293]: Rule /Common/SLOWROLL : HTTP REQUEST HEADER User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 OpenSSL/1.0.1l zlib/1.2.3 libidn/0.6.5
Apr 18 15:33:36 MAMA-ATM-SGDC info tmm1[11293]: Rule /Common/SLOWROLL : HTTP REQUEST HEADER Host: 150.29.100.98
Apr 18 15:33:36 MAMA-ATM-SGDC info tmm1[11293]: Rule /Common/SLOWROLL : HTTP REQUEST HEADER Accept: */*
Apr 18 15:33:36 MAMA-ATM-SGDC info tmm1[11293]: Rule /Common/SLOWROLL : HTTP REQUEST HEADER X-SLOWROLL: 1
Apr 18 15:33:36 MAMA-ATM-SGDC info tmm1[11293]: Rule /Common/SLOWROLL : SUMMARY: Client: 150.29.100.3:49555 -> VIP name is /Common/HSL_TEST_VS 150.29.100.98:80 and URL is 150.29.100.98/ -> Node: 10.29.100.20:80 with response 200