refactor: shorten response writer code

lib/handler.go

@@ -106,7 +106,7 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if r.Method == "HEAD" {
-		w = newResponseWriterNoBody(w)
+		w = responseWriterNoBody{w}
 	}
 
 	// Excerpt from RFC4918, section 9.4:
@@ -130,3 +130,11 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	// Runs the WebDAV.
 	user.ServeHTTP(w, r)
 }
+
+type responseWriterNoBody struct {
+	http.ResponseWriter
+}
+
+func (w responseWriterNoBody) Write(data []byte) (int, error) {
+	return 0, nil
+}

lib/response_writer.go

@@ -1,27 +0,0 @@
-package lib
-
-import "net/http"
-
-var _ http.ResponseWriter = responseWriterNoBody{}
-
-// responseWriterNoBody is a wrapper used to suppress the body of the response
-// to a request. Mainly used for HEAD requests.
-type responseWriterNoBody struct {
-	http.ResponseWriter
-}
-
-// newResponseWriterNoBody creates a new responseWriterNoBody.
-func newResponseWriterNoBody(w http.ResponseWriter) *responseWriterNoBody {
-	return &responseWriterNoBody{w}
-}
-
-// Write suppress the body.
-func (w responseWriterNoBody) Write(data []byte) (int, error) {
-	return 0, nil
-}
-
-// WriteHeader writes the header to the http.ResponseWriter.
-func (w responseWriterNoBody) WriteHeader(statusCode int) {
-	w.Header().Del("Content-Length")
-	w.ResponseWriter.WriteHeader(statusCode)
-}