Extending GoLang's http.ResponseWriter functionality to pre/post process responses
<p>I am trying to write a simple http MiddleWare handler that will process an http response.  Unfortunately, it does not work and I cannot figure out what mistake I am making.  Any/all help is appreciated!</p>

<p>I am using Go Gorilla mux router 
Here are illustrative parts of the code:</p>

<pre><code>import (
    "fmt"
    "log"
    "github.com/gorilla/mux"
)
:
func Start() {
    router := mux.NewRouter()
    router.HandleFunc("/", myHandler)
    :
    log.Fatal(http.ListenAndServe(":8088", Middleware(router)))
}

func myHandler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "myHandler called")
}
func Middleware(h http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        neww := NewProcessor(w)
        h.ServeHTTP(neww, r)
    })
}

type Processor struct {
    http.ResponseWriter
}
func (r *Processor) Write(b []byte) (int, error) {
    fmt.Printf("******* Processor writing...")
    log.Print(string(b)) // log it out
    return r.Write(b)    // pass it to the original ResponseWriter
}
func NewProcessor(w http.ResponseWriter) http.ResponseWriter {
    fmt.Printf("******* Creating new Processor...")
    return &amp;Processor{ResponseWriter: w}
}
</code></pre>

<p>The output I get is listed below (extra logging text omitted for clarity):</p>

<pre><code>******* Creating new Processor 
myHandler called
</code></pre>

<p>However, notice the message "******* Processor writing..." was not displayed, suggesting that the "Write" function did not get called.</p>

<p>What changes need to be made to allow the "Write" function to be called?</p>