VPP returns 200 even if a purge failed

[GabrSaac]

The solution should just be to check the status code of the response.

 response.StatusCode != 200

In your code:

response, err := varnishClient.Do(receivedReqCopy)
        if err != nil || response.StatusCode != 200 {

            log.Printf("%v%v Error sending request. Error: %v, Response: %+v\n", SERVICE_ID, LOG_FAIL, err, response)
            if *debug {
                log.Printf("%v For URL: %v\n", SERVICE_ID, receivedReqCopy.URL)
            }

            // discard and close response body

            respConcoChannel <- 500
            return
        }

[GabrSaac]

See for instance https://www.varnish-cache.org/docs/trunk/users-guide/purging.html

        if (req.method == "PURGE") {
                if (!client.ip ~ purge) {
                        return(synth(405,"Not allowed."));
                }
                return (purge);
        }
        ...
        if (req.method == "PURGE") {
            if (client.ip !~ purge) {
              return(synth(403, "Not allowed"));
            }
            ban("obj.http.url ~ " + req.url); # Assumes req.url is a regex. This might be a bit too simple
        }