Forum Discussion

Cirrus

Jun 04, 2023

Solved

Help with irule using switch

I need an irule that does the following - If host name equals xxx.com and uri equals /yyy redirect to xxy.com.... but I need to switch between 6 different URIs - I want to use the SWITCH command bu...

Jun 04, 2023

veredgfbll I believe what you're looking for is the following. Please keep in mind that you do not have to have the final else or the default action in the switch statement and these are just options if by chance you do have a default action you want to perform for the if statement if it doesn't match or the URI path for the single host match.

when HTTP_REQUEST priority 500 {

    set URI [string tolower [HTTP::uri]]

    if { [HTTP::host] == "xxx.com" } {
        switch -- ${URI} {
            "/yyy" {
                # can change http to https if you need to redirect to HTTPS instead
                HTTP::redirect "http://xxy.com/"
            }
            "uri_2" {
                # URI 2 action to execute
            }
            "uri_3" {
                # URI 3 action to execute
            }
            "uri_4" {
                # URI 4 action to execute
            }
            "uri_5" {
                # URI 5 action to execute
            }
            "uri_6" {
                # URI 6 action to execute
            }
            default {
                # default action to perform if URI doesn't match
            }
        }
    } else {
        # action to perform if HTTP::host doesn't match
    }

}

Paulius

Jun 05, 2023

veredgfbll The iRule you created can be configured as the following which you will notice the "default" match is completely removed since you don't want to perform any other action other than what the iRule and virtual server will already do if a match isn't found.

when HTTP_REQUEST priority 500 {

    set URI [string tolower [HTTP::uri]]

    if { [HTTP::host] == "www.hostname.com" } {
        switch -- ${URI} {
            "/aaa" {
                HTTP::respond 302 Location "https://www.test.com/aaa"
				#log local0. "redirect to https://www.test.com2/aaa completed"
            }
            "/aab" {
                HTTP::respond 302 Location "https://www.test.com/aab"
				#log local0. "redirect to https://www.test.com2/aab completed"
            }
            "/aac" {
                HTTP::respond 302 Location "https://www.test.com/aac"
				#log local0. "redirect to https://www.test.com2/aac completed"
            }
            "/aad" {
                HTTP::respond 302 Location "https://www.test.com/aad"
				#log local0. "redirect to https://www.test.com2/aad completed"
            }
            "/aae" {
                HTTP::respond 302 Location "https://www.test.com/aae"
				#log local0. "redirect to https://www.test.com2/aae completed"
            }
            "/aaf" {
                HTTP::respond 302 Location "https://www.test.com/aaf"
				#log local0. "redirect to https://www.test.com2/aaf completed"
            }
			"/aag" {
                HTTP::respond 302 Location "https://www.test.com/aag"
				#log local0. "redirect to https://www.test.com2/aag completed"
            }
        }
    }

}

veredgfbll

Cirrus

Jun 05, 2023

Just to clarify - I can leave the default empty?

whisperer

MVP

Jun 05, 2023

The default you would use if you want something 'special to occur'. For example, you can include a log statement to indicate the irule executed but didnt match on any URIs. You can also give the user a block page or whatnot. If nothing is being done, it is not needed. At that point, if nothing matches the switch statement, then the HTTP connection will work as configured on the Virtual Server... passing the HTTP request to a LB selected pool member. Also, if you are ALWAYS redirecting and dont host anything via Pool Members here, you can also do a HTTP respond 200 with a custom error message to return to the user.

Also, good idea on normalizing the URL to all lowercase and then performing the comparison. Many people miss that 😉

veredgfbll

Cirrus

Jun 05, 2023

so I can remove this bit?

default {
                # default action to perform if URI doesn't match
				return
            }

whisperer
MVP
Jun 05, 2023
In your particular application, that code doesnt do anything.

Paulius

MVP

Jun 05, 2023

when HTTP_REQUEST priority 500 {

    set URI [string tolower [HTTP::uri]]

    if { [HTTP::host] == "www.hostname.com" } {
        switch -- ${URI} {
            "/aaa" {
                HTTP::respond 302 Location "https://www.test.com/aaa"
				#log local0. "redirect to https://www.test.com2/aaa completed"
            }
            "/aab" {
                HTTP::respond 302 Location "https://www.test.com/aab"
				#log local0. "redirect to https://www.test.com2/aab completed"
            }
            "/aac" {
                HTTP::respond 302 Location "https://www.test.com/aac"
				#log local0. "redirect to https://www.test.com2/aac completed"
            }
            "/aad" {
                HTTP::respond 302 Location "https://www.test.com/aad"
				#log local0. "redirect to https://www.test.com2/aad completed"
            }
            "/aae" {
                HTTP::respond 302 Location "https://www.test.com/aae"
				#log local0. "redirect to https://www.test.com2/aae completed"
            }
            "/aaf" {
                HTTP::respond 302 Location "https://www.test.com/aaf"
				#log local0. "redirect to https://www.test.com2/aaf completed"
            }
			"/aag" {
                HTTP::respond 302 Location "https://www.test.com/aag"
				#log local0. "redirect to https://www.test.com2/aag completed"
            }
        }
    }

}