diff --git a/assets/common.go b/assets/common.go
new file mode 100644
index 0000000..d435c3e
--- /dev/null
+++ b/assets/common.go
@@ -0,0 +1,44 @@
+package assets
+
+import (
+	"XProxy/logger"
+	"io"
+	"time"
+)
+
+type upstream interface {
+	getTag() string
+	doRequest() io.Reader
+	lastModify() time.Time
+}
+
+type asset struct {
+	tag     string
+	stream  io.Reader
+	archive int
+}
+
+func (a *asset) debug(template string, args ...interface{}) {
+	logger.Debugf("[%s] "+template, append([]interface{}{a.tag}, args...)...)
+}
+
+func (a *asset) error(template string, args ...interface{}) {
+	logger.Errorf("[%s] "+template, append([]interface{}{a.tag}, args...)...)
+}
+
+func (a *asset) Read(p []byte) (n int, err error) {
+	n, err = a.stream.Read(p)
+	if err != nil && err != io.EOF { // data stream broken
+		switch a.archive {
+		case notArchive:
+			a.error("Failed to read data stream -> %v", err)
+		case gzipArchive:
+			a.error("Failed to extract gzip archive -> %v", err)
+		case bzip2Archive:
+			a.error("Failed to extract bzip2 archive -> %v", err)
+		case xzArchive:
+			a.error("Failed to extract xz archive -> %v", err)
+		}
+	}
+	return n, err
+}
diff --git a/assets/extract.go b/assets/extract.go
index 8c83400..94eebe6 100644
--- a/assets/extract.go
+++ b/assets/extract.go
@@ -1,7 +1,6 @@
 package assets
 
 import (
-	"XProxy/logger"
 	"bytes"
 	"compress/bzip2"
 	"github.com/gabriel-vasile/mimetype"
@@ -17,90 +16,65 @@ const (
 	xzArchive
 )
 
-// gzipExtract use to extract independent gzip archive data.
-func gzipExtract(data []byte) ([]byte, error) {
-	logger.Debugf("Start extracting gzip archive -> %d bytes", len(data))
-	reader, err := gzip.NewReader(bytes.NewReader(data))
+// gzipExtract use to extract independent gzip format stream.
+func gzipExtract(a *asset) error {
+	a.debug("Start extracting gzip archive stream")
+	reader, err := gzip.NewReader(a.stream)
 	if err != nil {
-		logger.Errorf("Failed to extract gzip archive -> %v", err)
-		return nil, err
+		a.error("Failed to extract gzip archive -> %v", err)
+		return err
 	}
-	defer reader.Close()
-
-	var buffer bytes.Buffer
-	size, err := reader.WriteTo(&buffer)
-	if err != nil {
-		logger.Errorf("Failed to handle gzip archive -> %v", err)
-		return nil, err
-	}
-	logger.Debugf("Extracted gzip archive successfully -> %d bytes", size)
-	return buffer.Bytes(), nil
+	a.stream, a.archive = reader, gzipArchive
+	return nil
 }
 
-// bzip2Extract use to extract independent bzip2 archive data.
-func bzip2Extract(data []byte) ([]byte, error) {
-	logger.Debugf("Start extracting bzip2 archive -> %d bytes", len(data))
-	reader := bzip2.NewReader(bytes.NewReader(data))
+// bzip2Extract use to extract independent bzip2 format stream.
+func bzip2Extract(a *asset) error {
+	a.debug("Start extracting bzip2 archive stream")
+	a.stream = bzip2.NewReader(a.stream)
+	a.archive = bzip2Archive
+	return nil
+}
 
-	var buffer bytes.Buffer
-	size, err := io.Copy(&buffer, reader)
+// xzExtract use to extract independent xz format stream.
+func xzExtract(a *asset) error {
+	a.debug("Start extracting xz archive stream")
+	reader, err := xz.NewReader(a.stream)
 	if err != nil {
-		logger.Errorf("Failed to extract bzip2 archive -> %v", err)
-		return nil, err
+		a.error("Failed to extract xz archive -> %v", err)
+		return err
 	}
-	logger.Debugf("Extracted bzip2 archive successfully -> %d bytes", size)
-	return buffer.Bytes(), nil
+	a.stream, a.archive = reader, xzArchive
+	return nil
 }
 
-// xzExtract use to extract independent xz archive data.
-func xzExtract(data []byte) ([]byte, error) {
-	logger.Debugf("Start extracting xz archive -> %d bytes", len(data))
-	reader, err := xz.NewReader(bytes.NewReader(data))
-	if err != nil {
-		logger.Errorf("Failed to extract xz archive -> %v", err)
-		return nil, err
+// tryExtract try to extract the data stream as a compressed format, and will
+// return the original data if it cannot be determined.
+func (a *asset) tryExtract() error {
+	if a.archive != notArchive {
+		return nil // already extracted
 	}
 
-	var buffer bytes.Buffer
-	size, err := io.Copy(&buffer, reader)
+	header := bytes.NewBuffer(nil)
+	mime, err := mimetype.DetectReader(io.TeeReader(a.stream, header))
 	if err != nil {
-		logger.Errorf("Failed to handle xz archive -> %v", err)
-		return nil, err
+		a.error("Failed to detect data stream -> %v", err)
+		return err
 	}
-	logger.Debugf("Extracted xz archive successfully -> %d bytes", size)
-	return buffer.Bytes(), nil
-}
+	a.stream = io.MultiReader(header, a.stream) // recycle reader
 
-// archiveType use to determine the type of archive file.
-func archiveType(data []byte) uint {
-	mime := mimetype.Detect(data)
-	switch mime.String() {
+	switch mime.String() { // extract with detected mime type
 	case "application/gzip":
-		logger.Debugf("Data detected as gzip format")
-		return gzipArchive
+		a.debug("Data detected as gzip format")
+		return gzipExtract(a)
 	case "application/x-bzip2":
-		logger.Debugf("Data detected as bzip2 format")
-		return bzip2Archive
+		a.debug("Data detected as bzip2 format")
+		return bzip2Extract(a)
 	case "application/x-xz":
-		logger.Debugf("Data detected as xz format")
-		return xzArchive
-	default:
-		logger.Debugf("Data detected as non-archive format -> `%s`", mime)
-		return notArchive
-	}
-}
-
-// tryExtract will try to extract the data as a compressed format, and will
-// return the original data if it cannot be determined.
-func tryExtract(data []byte) ([]byte, error) {
-	switch archiveType(data) {
-	case gzipArchive:
-		return gzipExtract(data)
-	case bzip2Archive:
-		return bzip2Extract(data)
-	case xzArchive:
-		return xzExtract(data)
+		a.debug("Data detected as xz format")
+		return xzExtract(a)
 	default:
-		return data, nil
+		a.debug("Data detected as non-archive format -> `%s`", mime)
+		return nil
 	}
 }
diff --git a/assets/extract_legacy.go b/assets/extract_legacy.go
new file mode 100644
index 0000000..1f47532
--- /dev/null
+++ b/assets/extract_legacy.go
@@ -0,0 +1,200 @@
+package assets
+
+//const (
+//	notArchive = iota
+//	gzipArchive
+//	bzip2Archive
+//	xzArchive
+//)
+
+//type archive struct {
+//	id    string
+//	size  uint64
+//	input io.Reader
+//}
+//
+//func (a *archive) Read(p []byte) (n int, err error) {
+//	n, err = a.input.Read(p)
+//	if err == io.EOF {
+//		logger.Debugf("read %d bytes", n)
+//
+//		logger.Debugf("reach ending")
+//		return n, err
+//	}
+//	if err != nil {
+//		logger.Errorf("Failed to extract archive -> %v", err)
+//
+//		// TODO: do close process
+//
+//		return n, err
+//	}
+//
+//	logger.Debugf("read %d bytes", n)
+//
+//	return n, err
+//}
+
+// gzipExtract use to extract independent gzip archive stream.
+//func gzipExtract(stream io.Reader) (io.Reader, error) {
+//	logger.Debugf("Start extracting gzip archive")
+//	reader, err := gzip.NewReader(stream)
+//	if err != nil {
+//		logger.Errorf("Failed to extract gzip archive -> %v", err)
+//		return nil, err
+//	}
+//	//defer reader.Close()
+//	return reader, nil
+//}
+
+// bzip2Extract use to extract independent bzip2 archive stream.
+//func bzip2Extract(stream io.Reader) (io.Reader, error) {
+//	logger.Debugf("Start extracting bzip2 archive")
+//	reader := bzip2.NewReader(stream)
+//	return reader, nil
+//}
+
+// xzExtract use to extract independent xz archive stream.
+//func xzExtract(stream io.Reader) (io.Reader, error) {
+//	logger.Debugf("Start extracting xz archive")
+//	reader, err := xz.NewReader(stream)
+//	if err != nil {
+//		logger.Errorf("Failed to extract xz archive -> %v", err)
+//		return nil, err
+//	}
+//	return reader, nil
+//}
+
+// gzipExtract use to extract independent gzip archive data.
+//func gzipExtract(data []byte) ([]byte, error) {
+//	logger.Debugf("Start extracting gzip archive -> %d bytes", len(data))
+//	reader, err := gzip.NewReader(bytes.NewReader(data))
+//	if err != nil {
+//		logger.Errorf("Failed to extract gzip archive -> %v", err)
+//		return nil, err
+//	}
+//	defer reader.Close()
+//
+//	var buffer bytes.Buffer
+//	size, err := reader.WriteTo(&buffer)
+//	if err != nil {
+//		logger.Errorf("Failed to handle gzip archive -> %v", err)
+//		return nil, err
+//	}
+//	logger.Debugf("Extracted gzip archive successfully -> %d bytes", size)
+//	return buffer.Bytes(), nil
+//}
+
+// bzip2Extract use to extract independent bzip2 archive data.
+//func bzip2Extract(data []byte) ([]byte, error) {
+//	logger.Debugf("Start extracting bzip2 archive -> %d bytes", len(data))
+//	reader := bzip2.NewReader(bytes.NewReader(data))
+//
+//	var buffer bytes.Buffer
+//	size, err := io.Copy(&buffer, reader)
+//	if err != nil {
+//		logger.Errorf("Failed to extract bzip2 archive -> %v", err)
+//		return nil, err
+//	}
+//	logger.Debugf("Extracted bzip2 archive successfully -> %d bytes", size)
+//	return buffer.Bytes(), nil
+//}
+
+// xzExtract use to extract independent xz archive data.
+//func xzExtract(data []byte) ([]byte, error) {
+//	logger.Debugf("Start extracting xz archive -> %d bytes", len(data))
+//	reader, err := xz.NewReader(bytes.NewReader(data))
+//	if err != nil {
+//		logger.Errorf("Failed to extract xz archive -> %v", err)
+//		return nil, err
+//	}
+//
+//	var buffer bytes.Buffer
+//	size, err := io.Copy(&buffer, reader)
+//	if err != nil {
+//		logger.Errorf("Failed to handle xz archive -> %v", err)
+//		return nil, err
+//	}
+//	logger.Debugf("Extracted xz archive successfully -> %d bytes", size)
+//	return buffer.Bytes(), nil
+//}
+
+//func recycleReader(input io.Reader) (mimeType string, recycled io.Reader, err error) {
+//	// header will store the bytes mimetype uses for detection.
+//	header := bytes.NewBuffer(nil)
+//
+//	// After DetectReader, the data read from input is copied into header.
+//	mtype, err := mimetype.DetectReader(io.TeeReader(input, header))
+//	if err != nil {
+//		fmt.Printf("error -> %v\n", err)
+//		return
+//	}
+//
+//	// Concatenate back the header to the rest of the file.
+//	// recycled now contains the complete, original data.
+//	recycled = io.MultiReader(header, input)
+//
+//	fmt.Printf("mime-type -> %v\n", mtype)
+//
+//	return mtype.String(), recycled, err
+//}
+
+// archiveType use to determine the type of archive file.
+//func archiveType(stream io.Reader) uint {
+//
+//	fmt.Println("start")
+//
+//	mime, stream, _ := recycleReader(stream)
+//
+//	fmt.Println("end")
+//
+//	//mime := mimetype.Detect(data)
+//	switch mime {
+//	case "application/gzip":
+//		logger.Debugf("Data detected as gzip format")
+//		return gzipArchive
+//	case "application/x-bzip2":
+//		logger.Debugf("Data detected as bzip2 format")
+//		return bzip2Archive
+//	case "application/x-xz":
+//		logger.Debugf("Data detected as xz format")
+//		return xzArchive
+//	default:
+//		logger.Debugf("Data detected as non-archive format -> `%s`", mime)
+//		return notArchive
+//	}
+//}
+
+// archiveType use to determine the type of archive file.
+//func archiveType(data []byte) uint {
+//	mime := mimetype.Detect(data)
+//	switch mime.String() {
+//	case "application/gzip":
+//		logger.Debugf("Data detected as gzip format")
+//		return gzipArchive
+//	case "application/x-bzip2":
+//		logger.Debugf("Data detected as bzip2 format")
+//		return bzip2Archive
+//	case "application/x-xz":
+//		logger.Debugf("Data detected as xz format")
+//		return xzArchive
+//	default:
+//		logger.Debugf("Data detected as non-archive format -> `%s`", mime)
+//		return notArchive
+//	}
+//}
+
+// tryExtract will try to extract the data as a compressed format, and will
+// return the original data if it cannot be determined.
+//func tryExtract(data []byte) ([]byte, error) {
+//	//switch archiveType(data) {
+//	//case gzipArchive:
+//	//	//return gzipExtract(data)
+//	//case bzip2Archive:
+//	//	//return bzip2Extract(data)
+//	//case xzArchive:
+//	//	//return xzExtract(data)
+//	//default:
+//	//	return data, nil
+//	//}
+//	return nil, nil
+//}
diff --git a/assets/extract_test.go b/assets/extract_test.go
index e025af3..e231a84 100644
--- a/assets/extract_test.go
+++ b/assets/extract_test.go
@@ -1,12 +1,14 @@
 package assets
 
 import (
+	"XProxy/logger"
 	"bytes"
 	"compress/gzip"
 	"crypto/rand"
+	"fmt"
 	"github.com/dsnet/compress/bzip2"
-	"github.com/stretchr/testify/assert"
 	"github.com/ulikunitz/xz"
+	"io"
 	mrand "math/rand"
 	"testing"
 )
@@ -27,7 +29,8 @@ func randInt(min int, max int) int {
 
 func randData() []byte {
 	raw := randBytes(1024)
-	size := randInt(testMinSize, testMaxSize)
+	//size := randInt(testMinSize, testMaxSize)
+	size := 257
 	var buffer bytes.Buffer
 	for i := 0; i < size; i++ {
 		buffer.Write(raw)
@@ -61,58 +64,178 @@ func xzCompress(data []byte) []byte {
 	return buf.Bytes()
 }
 
-func TestGzipExtract(t *testing.T) {
-	raw := randData()
-	gzOk := gzipCompress(raw)
-	gzErr := append(gzOk, randBytes(randInt(1, 16))...)
-
-	ret, err := gzipExtract(gzOk)
-	assert.Nil(t, err)
-	assert.Equal(t, raw, ret)
-	_, err = gzipExtract(gzErr)
-	assert.NotNil(t, err)
+//func TestGzipExtract(t *testing.T) {
+//	raw := randData()
+//	gzOk := gzipCompress(raw)
+//	gzErr := append(gzOk, randBytes(randInt(1, 16))...)
+//
+//	ret, err := gzipExtract(gzOk)
+//	assert.Nil(t, err)
+//	assert.Equal(t, raw, ret)
+//	_, err = gzipExtract(gzErr)
+//	assert.NotNil(t, err)
+//}
+
+//func TestBzip2Extract(t *testing.T) {
+//	raw := randData()
+//	bz2Ok := bzip2Compress(raw)
+//	bz2Err := append(bz2Ok, randBytes(randInt(1, 16))...)
+//
+//	ret, err := bzip2Extract(bz2Ok)
+//	assert.Nil(t, err)
+//	assert.Equal(t, raw, ret)
+//	_, err = bzip2Extract(bz2Err)
+//	assert.NotNil(t, err)
+//}
+
+//func TestXzExtract(t *testing.T) {
+//	raw := randData()
+//	xzOk := xzCompress(raw)
+//	xzErr := append(xzOk, randBytes(randInt(1, 16))...)
+//
+//	ret, err := xzExtract(xzOk)
+//	assert.Nil(t, err)
+//	assert.Equal(t, raw, ret)
+//	_, err = xzExtract(xzErr)
+//	assert.NotNil(t, err)
+//}
+
+//func TestExtract(t *testing.T) {
+//	raw := randData()
+//
+//	ret, err := tryExtract(raw)
+//	assert.Nil(t, err)
+//	assert.Equal(t, raw, ret)
+//
+//	ret, err = tryExtract(gzipCompress(raw))
+//	assert.Nil(t, err)
+//	assert.Equal(t, raw, ret)
+//
+//	ret, err = tryExtract(bzip2Compress(raw))
+//	assert.Nil(t, err)
+//	assert.Equal(t, raw, ret)
+//
+//	ret, err = tryExtract(xzCompress(raw))
+//	assert.Nil(t, err)
+//	assert.Equal(t, raw, ret)
+//}
+
+func Test_demo(t *testing.T) {
+	//data := gzipCompress(randData())
+	//data := randData()
+	//data = append(data, randBytes(randInt(1, 16))...)
+	//fmt.Printf("origin gzip size -> %d\n", len(data))
+
+	//data := randData()
+	//data := bzip2Compress(randData())
+	//data = append(data, randBytes(randInt(1, 16))...)
+	//fmt.Printf("origin bzip2 size -> %d\n", len(data))
+
+	//data := randData()
+	data := xzCompress(randData())
+	data = append(data, randBytes(randInt(1, 16))...)
+	fmt.Printf("origin xz size -> %d\n", len(data))
+
+	//buffer := bytes.NewReader(data)
+
+	//reader, err := gzipExtract(buffer)
+	//reader, err := bzip2Extract(buffer)
+	//reader, err := xzExtract(buffer)
+
+	//archiveType(buffer)
+
+	//fmt.Printf("%v\n", err)
+	//
+	//buf := make([]byte, 1024*1024*4)
+	//for {
+	//	n, err := reader.Read(buf)
+	//
+	//	if err == io.EOF {
+	//		fmt.Println("reach stream ending")
+	//		break
+	//	}
+	//	if err != nil {
+	//		fmt.Printf("stream error -> %v", err)
+	//		return
+	//	}
+	//
+	//	fmt.Printf("get %d bytes\n", n)
+	//
+	//}
+
 }
 
-func TestBzip2Extract(t *testing.T) {
-	raw := randData()
-	bz2Ok := bzip2Compress(raw)
-	bz2Err := append(bz2Ok, randBytes(randInt(1, 16))...)
-
-	ret, err := bzip2Extract(bz2Ok)
-	assert.Nil(t, err)
-	assert.Equal(t, raw, ret)
-	_, err = bzip2Extract(bz2Err)
-	assert.NotNil(t, err)
+func init() {
+	logger.SetLevel(logger.DebugLevel)
 }
 
-func TestXzExtract(t *testing.T) {
-	raw := randData()
-	xzOk := xzCompress(raw)
-	xzErr := append(xzOk, randBytes(randInt(1, 16))...)
-
-	ret, err := xzExtract(xzOk)
-	assert.Nil(t, err)
-	assert.Equal(t, raw, ret)
-	_, err = xzExtract(xzErr)
-	assert.NotNil(t, err)
+//func Test_archive(t *testing.T) {
+//	data := gzipCompress(randData())
+//	fmt.Printf("origin gzip size -> %d\n", len(data))
+//
+//	kk := asset{
+//		tag:     "A7B932FD11",
+//		stream: bytes.NewReader(data),
+//	}
+//
+//	kk.gzipExtract()
+//
+//	buf := make([]byte, 4*1024*1024)
+//	for {
+//		n, err := kk.stream.Read(buf)
+//
+//		if err == io.EOF {
+//			fmt.Printf("get %d bytes\n", n)
+//			fmt.Printf("reach stream ending\n")
+//			return
+//		}
+//
+//		if err != nil {
+//			fmt.Printf("stream error -> %v\n", err)
+//			return
+//		}
+//		fmt.Printf("get %d bytes\n", n)
+//	}
+//
+//}
+
+type brokenReader struct {
+	time int
 }
 
-func TestExtract(t *testing.T) {
-	raw := randData()
+func (b *brokenReader) Read(p []byte) (n int, err error) {
+	b.time += 1
+
+	fmt.Printf("Read time = %d\n", b.time)
 
-	ret, err := tryExtract(raw)
-	assert.Nil(t, err)
-	assert.Equal(t, raw, ret)
+	if b.time < 16 {
+		return 1024, nil
+	} else {
+		return 0, io.ErrShortWrite
+	}
+
+}
 
-	ret, err = tryExtract(gzipCompress(raw))
-	assert.Nil(t, err)
-	assert.Equal(t, raw, ret)
+func Test_extract(t *testing.T) {
 
-	ret, err = tryExtract(bzip2Compress(raw))
-	assert.Nil(t, err)
-	assert.Equal(t, raw, ret)
+	raw := randData()
+	data := gzipCompress(raw)
+	data = append(data, randBytes(3)...)
+	fmt.Printf("origin data size -> %d\n", len(data))
+
+	as := asset{
+		tag: "DEMO",
+		//stream: &brokenReader{time: 0},
+		stream: bytes.NewReader(data),
+	}
+	if err := as.tryExtract(); err != nil {
+		fmt.Printf("try extract error -> %v\n", err)
+	} else {
+		if n, err := io.Copy(io.Discard, &as); err != nil {
+			fmt.Printf("data stream error -> %v\n", err)
+		} else {
+			fmt.Printf("data stream complete -> %d bytes\n", n)
+		}
+	}
 
-	ret, err = tryExtract(xzCompress(raw))
-	assert.Nil(t, err)
-	assert.Equal(t, raw, ret)
 }
diff --git a/assets/update.go b/assets/update.go
index 799e60b..8adcbca 100644
--- a/assets/update.go
+++ b/assets/update.go
@@ -49,9 +49,9 @@ func updateRemoteAsset(file string, url string, proxy *urlpkg.URL) error {
 		logger.Errorf("Failed to download remote asset `%s`", url)
 		return err
 	}
-	if asset, err = tryExtract(asset); err != nil {
-		return err
-	}
+	//if asset, err = tryExtract(asset); err != nil {
+	//	return err
+	//}
 	if err := saveAsset(file, asset, date); err != nil {
 		return err
 	}
@@ -79,9 +79,9 @@ func updateLocalAsset(file string, src string) error {
 		logger.Errorf("Failed to read local asset -> %v", err)
 		return err
 	}
-	if asset, err = tryExtract(asset); err != nil {
-		return err
-	}
+	//if asset, err = tryExtract(asset); err != nil {
+	//	return err
+	//}
 	if err := saveAsset(file, asset, &date); err != nil {
 		return err
 	}