TCL error message with X-Forwarded-For iRule

Can you try a combined version?

when HTTP_REQUEST {
     'root domain redirect'
    if { [HTTP::host] eq "mydomain.com" } {
        HTTP::respond 301 Location http://www.mydomain.com[HTTP::uri]
    } elseif { [set redir [class lookup [string tolower [HTTP::uri]] equals REDIRECTS_301_SCO]] ne "" } {
        HTTP::respond 301 Location $redir
    } elseif { "[HTTP::host][HTTP::uri]" eq "asia.mydomain.com/taiwan" } {
        HTTP::redirect http://www.mydomain.com/something
    } elseif { "[HTTP::host][HTTP::uri]" eq "asia.mydomain.com/hongkong" } {
        HTTP::redirect http://www.mydomain.com/something
    } elseif { "[HTTP::host][HTTP::uri]" eq "asia.mydomain.com/china" } {
        HTTP::redirect http://www.mydomain.com/something
    } elseif  { [HTTP::host] contains "asia.mydomain.com" } {
        HTTP::redirect http://www.mydomain.com
    } else {
         Always need to remove any existing XFF headers.
        if {[HTTP::header exists X-Forwarded-For]}{
            HTTP::header remove X-Forwarded-For
        }
         If the ‘True-Client-IP’ header exists use it, otherwise just use client address.
        if {[HTTP::header exists True-Client-IP]}{
            HTTP::header replace X-Forwarded-For [HTTP::header value True-Client-IP]
        } else {
            HTTP::header replace X-Forwarded-For [IP::client_addr]
        }
    }
}

There were a few issues:

• Tcl error from trying to issue a redirect and insert an HTTP header for the same request
• [HTTP::request] returns all the HTTP headers of a request. I think you want the host header value and the URI so I used [HTTP::host][HTTP::uri] and removed the protocol from the strings you were checking
• == should be used for numeric comparisons. Use eq for string comparisons.
• You can save the output from class lookup instead of running two commands

Aaron