diff --git a/handler.go b/handler.go
index ba3ad12..5bfb84d 100644
--- a/handler.go
+++ b/handler.go
@@ -55,14 +55,14 @@ func handleRequest(reqObj js.Value, runtimeCtxObj js.Value) (js.Value, error) {
 	req = req.WithContext(ctx)
 	reader, writer := io.Pipe()
 	w := &jsutil.ResponseWriterBuffer{
-		header:     http.Header{},
-		statusCode: http.StatusOK,
-		reader:     reader,
-		writer:     writer,
-		readyCh:    make(chan struct{}),
+		HeaderValue: http.Header{},
+		StatusCode:  http.StatusOK,
+		Reader:      reader,
+		Writer:      writer,
+		ReadyCh:     make(chan struct{}),
 	}
 	go func() {
-		defer w.ready()
+		defer w.Ready()
 		defer writer.Close()
 		httpHandler.ServeHTTP(w, req)
 	}()
diff --git a/internal/jsutil/response.go b/internal/jsutil/response.go
index 62343a2..d114af7 100644
--- a/internal/jsutil/response.go
+++ b/internal/jsutil/response.go
@@ -16,8 +16,8 @@ func ToJSHeader(header http.Header) js.Value {
 }
 
 func ToJSResponse(w *ResponseWriterBuffer) (js.Value, error) {
-	<-w.readyCh // wait until ready
-	status := w.statusCode
+	<-w.ReadyCh // wait until ready
+	status := w.StatusCode
 	if status == 0 {
 		status = http.StatusOK
 	}
@@ -25,6 +25,6 @@ func ToJSResponse(w *ResponseWriterBuffer) (js.Value, error) {
 	respInit.Set("status", status)
 	respInit.Set("statusText", http.StatusText(status))
 	respInit.Set("headers", ToJSHeader(w.Header()))
-	readableStream := ConvertReaderToReadableStream(w.reader)
+	readableStream := ConvertReaderToReadableStream(w.Reader)
 	return ResponseClass.New(readableStream, respInit), nil
 }
diff --git a/internal/jsutil/responsewriter.go b/internal/jsutil/responsewriter.go
index 4938d3d..62327b4 100644
--- a/internal/jsutil/responsewriter.go
+++ b/internal/jsutil/responsewriter.go
@@ -7,32 +7,32 @@ import (
 )
 
 type ResponseWriterBuffer struct {
-	header     http.Header
-	statusCode int
-	reader     *io.PipeReader
-	writer     *io.PipeWriter
-	readyCh    chan struct{}
-	once       sync.Once
+	HeaderValue http.Header
+	StatusCode  int
+	Reader      *io.PipeReader
+	Writer      *io.PipeWriter
+	ReadyCh     chan struct{}
+	Once        sync.Once
 }
 
 var _ http.ResponseWriter = &ResponseWriterBuffer{}
 
-// ready indicates that ResponseWriterBuffer is ready to be converted to Response.
-func (w *ResponseWriterBuffer) ready() {
-	w.once.Do(func() {
-		close(w.readyCh)
+// Ready indicates that ResponseWriterBuffer is ready to be converted to Response.
+func (w *ResponseWriterBuffer) Ready() {
+	w.Once.Do(func() {
+		close(w.ReadyCh)
 	})
 }
 
 func (w *ResponseWriterBuffer) Write(data []byte) (n int, err error) {
-	w.ready()
-	return w.writer.Write(data)
+	w.Ready()
+	return w.Writer.Write(data)
 }
 
 func (w *ResponseWriterBuffer) Header() http.Header {
-	return w.header
+	return w.HeaderValue
 }
 
 func (w *ResponseWriterBuffer) WriteHeader(statusCode int) {
-	w.statusCode = statusCode
+	w.StatusCode = statusCode
 }