Rewrite HTTP response when error code received

Since you can't access HTTP::uri in the response, you'll need to set a variable in HTTP_REQUEST so you can access it.

If you look at the HTTP::retry command (see the last example on that page), you may be able to retry the request and change the request so you can get a different response from another server. (You may have to add some logic in your HTTP_REQUEST event to handle whatever host/location you use in the updated request).

If you ever wanted to just return a custom payload from within your iRule, you could use something like this codeshare entry to get you started.

Hope this helps

Thanks Michael

I do not want to attempt to get response from another server. I just want to redirect/rewrite to the error page.

I dont think HTTP:retry will help with this.

The payload probably wont work either as i am not 'collecting' any data.

You originally mentioned you don't want to use a 302 redirect for the client, but want to get the error page from somewhere your publishing team can update quickly, right? In that case, if they need a page to update on a server, the HTTP::retry would allow you to basically do a redirect that the user never sees because it's all contained in the F5.

Otherwise if you just have custom content to return to the user, I think you can use the

HTTP::respond 200 content ""

You could also use a sideband connection to capture the response that is hosted on the other domain and return that as the response in place of the 500 error. https://devcentral.f5.com/wiki/irules.SIDEBAND.ashx

Thanks guys - i will have a look at this.

Here's another approach that doesn't require HTTP::uri. The rule may or may not work as-is since I pulled out environment-specific stuff and inserted your new pool and host. However, it should still provide a template.

when HTTP_RESPONSE {

    if { [HTTP::status] equals 403 || [HTTP::status] equals 404 } {

         Retrieve the not-found page if the HTTP status is 403, 404
         Note: Retrieving the page is a valid request, which means that the server will respond with a 200 OK.
               This necessitates that we collect the payload so we can later construct a custom response with
               the proper HTTP response code (404) but with the payload (HTML) from this request.

        if { ![info exists retry] } {

            set retry 1

            HTTP::header replace Host "new.domain.com"
            pool /TEST/POOL_FOR_NEW_DOMAIN
            HTTP::retry "GET /error/not-found/ HTTP/1.1\r\nHost:$requested_host\r\n\r\n"

        }

    }

    if { [info exists is404] } {

        if { [HTTP::status] equals 200 } {

             store the payload of the not-found page if the HTTP status is 200
             (this means that the error page was found on the file system)

            HTTP::collect [HTTP::header Content-Length]

        } else {

             No error page was found in the folder. Construct a generic error page
             and send it to the client.

            log local0.debug "is404 true, but there's no error page on the file system. ([HTTP::status])"

            HTTP::respond 404 content {

                
                    
                        
                    
                

            }

        }

    }

}

when HTTP_RESPONSE_DATA {

     Construct the response with the payload of the not-found page that we collected earlier and
     with the HTTP Response Code "404".

    HTTP::respond 404 content [HTTP::payload] "Content-Type" "text/html"

}

Thnaks for all the help. I have taken a rather simplistic view on this and just done a simple HTTP::respond

 HTTP::respond 302 noserver Location "https://existing.domain.com/federror"

Then in the top part of the iRule i have added:

} elseif {($requestedURI starts_with "/error") or ($requestedURI starts_with "/content")} {
      pool /PARTITION/POOL_HOSTING_ERROR_PAGE

And this is working.

Thanks