--- a/controllers/externalwfs.go	Tue Aug 07 16:40:08 2018 +0200
+++ b/controllers/externalwfs.go	Tue Aug 07 16:44:59 2018 +0200
@@ -148,43 +148,46 @@
 	resp.Header.Del("X-Gemma-From")
 	resp.Header.Del("X-Gemma-To")
 
-	if isXML(resp.Header) {
-		log.Printf("rewrite from %s to %s\n", from, to)
+	if !isXML(resp.Header) {
+		return nil
+	}
 
-		pr, pw := io.Pipe()
+	log.Printf("rewrite from %s to %s\n", from, to)
+
+	pr, pw := io.Pipe()
 
-		var (
-			r   io.ReadCloser
-			w   io.WriteCloser
-			err error
-		)
+	var (
+		r   io.ReadCloser
+		w   io.WriteCloser
+		err error
+	)
 
-		reader, writer := encoding(resp.Header)
+	reader, writer := encoding(resp.Header)
 
-		if r, err = reader(resp.Body); err != nil {
-			return err
-		}
+	if r, err = reader(resp.Body); err != nil {
+		return err
+	}
 
-		if w, err = writer(pw); err != nil {
-			return err
-		}
+	if w, err = writer(pw); err != nil {
+		return err
+	}
 
-		go func(force io.ReadCloser) {
-			defer func() {
-				//r.Close()
-				w.Close()
-				pw.Close()
-				force.Close()
-			}()
-			if err := rewrite(w, r, from, to); err != nil {
-				log.Printf("rewrite failed: %v\n", err)
-				return
-			}
-			log.Println("rewrite successful")
-		}(resp.Body)
+	go func(force io.ReadCloser) {
+		defer func() {
+			//r.Close()
+			w.Close()
+			pw.Close()
+			force.Close()
+		}()
+		if err := rewrite(w, r, from, to); err != nil {
+			log.Printf("rewrite failed: %v\n", err)
+			return
+		}
+		log.Println("rewrite successful")
+	}(resp.Body)
 
-		resp.Body = pr
-	}
+	resp.Body = pr
+
 	return nil
 }