filter out SOURCE requests

http.go

@@ -116,5 +116,9 @@ func (h *HttpRedirector) serveSource(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *HttpRedirector) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	// TODO: pick between serveRelay() and serveSource().
+	if r.Method == "SOURCE" {
+		serveSource(w, r)
+	} else {
+		serveRelay(w, r)
+	}
 }