diff --git a/transport/internet/authenticators/http/http.go b/transport/internet/authenticators/http/http.go
index 767a7215..07cfae00 100644
--- a/transport/internet/authenticators/http/http.go
+++ b/transport/internet/authenticators/http/http.go
@@ -41,6 +41,12 @@ type HeaderWriter struct {
 	header *alloc.Buffer
 }
 
+func NewHeaderWriter(header *alloc.Buffer) *HeaderWriter {
+	return &HeaderWriter{
+		header: header,
+	}
+}
+
 func (this *HeaderWriter) Write(writer io.Writer) error {
 	if this.header == nil {
 		return nil
diff --git a/transport/internet/authenticators/http/http_test.go b/transport/internet/authenticators/http/http_test.go
new file mode 100644
index 00000000..021c0e36
--- /dev/null
+++ b/transport/internet/authenticators/http/http_test.go
@@ -0,0 +1,23 @@
+package http_test
+
+import (
+	"testing"
+
+	"v2ray.com/core/common/alloc"
+	"v2ray.com/core/testing/assert"
+	. "v2ray.com/core/transport/internet/authenticators/http"
+)
+
+func TestReaderWriter(t *testing.T) {
+	assert := assert.On(t)
+
+	cache := alloc.NewBuffer()
+	writer := NewHeaderWriter(alloc.NewLocalBuffer(256).Clear().AppendString("abcd" + ENDING))
+	writer.Write(cache)
+	cache.Write([]byte{'e', 'f', 'g'})
+
+	reader := &HeaderReader{}
+	buffer, err := reader.Read(cache)
+	assert.Error(err).IsNil()
+	assert.Bytes(buffer.Value).Equals([]byte{'e', 'f', 'g'})
+}