diff --git a/unmaintained/volume_tailer/volume_tailer.go b/unmaintained/volume_tailer/volume_tailer.go
index d9220d2de..9458ea6c7 100644
--- a/unmaintained/volume_tailer/volume_tailer.go
+++ b/unmaintained/volume_tailer/volume_tailer.go
@@ -48,8 +48,8 @@ func main() {
 		if *showTextFile {
 
 			data := n.Data
-			if n.IsGzipped() {
-				if data, err = util2.UnGzipData(data); err != nil {
+			if n.IsCompressed() {
+				if data, err = util2.UnCompressData(data); err != nil {
 					return err
 				}
 			}
@@ -57,7 +57,7 @@ func main() {
 				println(string(data))
 			}
 
-			println("-", n.String(), "compressed", n.IsGzipped(), "original size", len(data))
+			println("-", n.String(), "compressed", n.IsCompressed(), "original size", len(data))
 		}
 		return nil
 	})
diff --git a/weed/command/export.go b/weed/command/export.go
index 8c32b3f4d..5d304b5a0 100644
--- a/weed/command/export.go
+++ b/weed/command/export.go
@@ -19,6 +19,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage/needle_map"
 	"github.com/chrislusf/seaweedfs/weed/storage/super_block"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
+	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 const (
@@ -79,7 +80,7 @@ func printNeedle(vid needle.VolumeId, n *needle.Needle, version needle.Version,
 		key,
 		n.Name,
 		size,
-		n.IsGzipped(),
+		n.IsCompressed(),
 		n.Mime,
 		n.LastModifiedString(),
 		n.Ttl.String(),
@@ -108,8 +109,8 @@ func (scanner *VolumeFileScanner4Export) VisitNeedle(n *needle.Needle, offset in
 	vid := scanner.vid
 
 	nv, ok := needleMap.Get(n.Id)
-	glog.V(3).Infof("key %d offset %d size %d disk_size %d gzip %v ok %v nv %+v",
-		n.Id, offset, n.Size, n.DiskSize(scanner.version), n.IsGzipped(), ok, nv)
+	glog.V(3).Infof("key %d offset %d size %d disk_size %d compressed %v ok %v nv %+v",
+		n.Id, offset, n.Size, n.DiskSize(scanner.version), n.IsCompressed(), ok, nv)
 	if ok && nv.Size > 0 && nv.Size != types.TombstoneFileSize && nv.Offset.ToAcutalOffset() == offset {
 		if newerThanUnix >= 0 && n.HasLastModifiedDate() && n.LastModified < uint64(newerThanUnix) {
 			glog.V(3).Infof("Skipping this file, as it's old enough: LastModified %d vs %d",
@@ -242,8 +243,11 @@ func writeFile(vid needle.VolumeId, n *needle.Needle) (err error) {
 
 	fileName := fileNameTemplateBuffer.String()
 
-	if n.IsGzipped() && path.Ext(fileName) != ".gz" {
-		fileName = fileName + ".gz"
+	if n.IsCompressed() {
+		if util.IsGzippedContent(n.Data) && path.Ext(fileName) != ".gz" {
+			fileName = fileName + ".gz"
+		}
+		// TODO other compression method
 	}
 
 	tarHeader.Name, tarHeader.Size = fileName, int64(len(n.Data))
diff --git a/weed/command/fix.go b/weed/command/fix.go
index 90d1c4893..223808f4b 100644
--- a/weed/command/fix.go
+++ b/weed/command/fix.go
@@ -46,7 +46,7 @@ func (scanner *VolumeFileScanner4Fix) ReadNeedleBody() bool {
 }
 
 func (scanner *VolumeFileScanner4Fix) VisitNeedle(n *needle.Needle, offset int64, needleHeader, needleBody []byte) error {
-	glog.V(2).Infof("key %d offset %d size %d disk_size %d gzip %v", n.Id, offset, n.Size, n.DiskSize(scanner.version), n.IsGzipped())
+	glog.V(2).Infof("key %d offset %d size %d disk_size %d compressed %v", n.Id, offset, n.Size, n.DiskSize(scanner.version), n.IsCompressed())
 	if n.Size > 0 && n.Size != types.TombstoneFileSize {
 		pe := scanner.nm.Set(n.Id, types.ToOffset(offset), n.Size)
 		glog.V(2).Infof("saved %d with error %v", n.Size, pe)
diff --git a/weed/operation/chunked_file.go b/weed/operation/chunked_file.go
index baa0038c4..3ee8f5079 100644
--- a/weed/operation/chunked_file.go
+++ b/weed/operation/chunked_file.go
@@ -53,10 +53,10 @@ func (s ChunkList) Len() int           { return len(s) }
 func (s ChunkList) Less(i, j int) bool { return s[i].Offset < s[j].Offset }
 func (s ChunkList) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
 
-func LoadChunkManifest(buffer []byte, isGzipped bool) (*ChunkManifest, error) {
-	if isGzipped {
+func LoadChunkManifest(buffer []byte, isCompressed bool) (*ChunkManifest, error) {
+	if isCompressed {
 		var err error
-		if buffer, err = util.UnGzipData(buffer); err != nil {
+		if buffer, err = util.UnCompressData(buffer); err != nil {
 			return nil, err
 		}
 	}
diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index b26b82800..7216853ac 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -121,7 +121,7 @@ func doUploadData(uploadUrl string, filename string, cipher bool, data []byte, i
 		}
 	} else if isInputGzipped {
 		// just to get the clear data length
-		clearData, err := util.UnGzipData(data)
+		clearData, err := util.UnCompressData(data)
 		if err == nil {
 			clearDataLen = len(clearData)
 		}
diff --git a/weed/server/volume_grpc_file.go b/weed/server/volume_grpc_file.go
index 4d71ddeb1..61fcaeb00 100644
--- a/weed/server/volume_grpc_file.go
+++ b/weed/server/volume_grpc_file.go
@@ -11,6 +11,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
+// Deprecated
 func (vs *VolumeServer) FileGet(req *volume_server_pb.FileGetRequest, stream volume_server_pb.VolumeServer_FileGetServer) error {
 
 	headResponse := &volume_server_pb.FileGetResponse{}
@@ -90,10 +91,10 @@ func (vs *VolumeServer) FileGet(req *volume_server_pb.FileGetRequest, stream vol
 	}
 	headResponse.ContentType = mtype
 
-	headResponse.IsGzipped = n.IsGzipped()
+	headResponse.IsGzipped = n.IsCompressed()
 
-	if n.IsGzipped() && req.AcceptGzip {
-		if n.Data, err = util.UnGzipData(n.Data); err != nil {
+	if n.IsCompressed() && req.AcceptGzip {
+		if n.Data, err = util.UnCompressData(n.Data); err != nil {
 			glog.V(0).Infof("ungzip %s error: %v", req.FileId, err)
 		}
 	}
diff --git a/weed/server/volume_server_handlers_read.go b/weed/server/volume_server_handlers_read.go
index 19b459136..d20cd5670 100644
--- a/weed/server/volume_server_handlers_read.go
+++ b/weed/server/volume_server_handlers_read.go
@@ -143,17 +143,19 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request)
 	}
 
 	if ext != ".gz" {
-		if n.IsGzipped() {
+		if n.IsCompressed() {
 			if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
 				if _, _, _, shouldResize := shouldResizeImages(ext, r); shouldResize {
-					if n.Data, err = util.UnGzipData(n.Data); err != nil {
+					if n.Data, err = util.UnCompressData(n.Data); err != nil {
 						glog.V(0).Infoln("ungzip error:", err, r.URL.Path)
 					}
 				} else {
-					w.Header().Set("Content-Encoding", "gzip")
+					if util.IsGzippedContent(n.Data) {
+						w.Header().Set("Content-Encoding", "gzip")
+					}
 				}
 			} else {
-				if n.Data, err = util.UnGzipData(n.Data); err != nil {
+				if n.Data, err = util.UnCompressData(n.Data); err != nil {
 					glog.V(0).Infoln("ungzip error:", err, r.URL.Path)
 				}
 			}
@@ -172,7 +174,7 @@ func (vs *VolumeServer) tryHandleChunkedFile(n *needle.Needle, fileName string,
 		return false
 	}
 
-	chunkManifest, e := operation.LoadChunkManifest(n.Data, n.IsGzipped())
+	chunkManifest, e := operation.LoadChunkManifest(n.Data, n.IsCompressed())
 	if e != nil {
 		glog.V(0).Infof("load chunked manifest (%s) error: %v", r.URL.Path, e)
 		return false
diff --git a/weed/server/volume_server_handlers_write.go b/weed/server/volume_server_handlers_write.go
index 9a00dcc29..74dad28de 100644
--- a/weed/server/volume_server_handlers_write.go
+++ b/weed/server/volume_server_handlers_write.go
@@ -120,7 +120,7 @@ func (vs *VolumeServer) DeleteHandler(w http.ResponseWriter, r *http.Request) {
 	count := int64(n.Size)
 
 	if n.IsChunkedManifest() {
-		chunkManifest, e := operation.LoadChunkManifest(n.Data, n.IsGzipped())
+		chunkManifest, e := operation.LoadChunkManifest(n.Data, n.IsCompressed())
 		if e != nil {
 			writeJsonError(w, r, http.StatusInternalServerError, fmt.Errorf("Load chunks manifest error: %v", e))
 			return
diff --git a/weed/storage/needle/needle.go b/weed/storage/needle/needle.go
index d3969e868..7d02758d6 100644
--- a/weed/storage/needle/needle.go
+++ b/weed/storage/needle/needle.go
@@ -81,7 +81,7 @@ func CreateNeedleFromRequest(r *http.Request, fixJpgOrientation bool, sizeLimit
 		}
 	}
 	if pu.IsGzipped {
-		n.SetGzipped()
+		n.SetIsCompressed()
 	}
 	if n.LastModified == 0 {
 		n.LastModified = uint64(time.Now().Unix())
diff --git a/weed/storage/needle/needle_parse_upload.go b/weed/storage/needle/needle_parse_upload.go
index 9873c2412..c1fb10713 100644
--- a/weed/storage/needle/needle_parse_upload.go
+++ b/weed/storage/needle/needle_parse_upload.go
@@ -51,7 +51,7 @@ func ParseUpload(r *http.Request, sizeLimit int64) (pu *ParsedUpload, e error) {
 
 	pu.OriginalDataSize = len(pu.Data)
 	pu.UncompressedData = pu.Data
-	// println("received data", len(pu.Data), "isGzipped", pu.IsGzipped, "mime", pu.MimeType, "name", pu.FileName)
+	// println("received data", len(pu.Data), "isGzipped", pu.IsCompressed, "mime", pu.MimeType, "name", pu.FileName)
 	if pu.MimeType == "" {
 		pu.MimeType = http.DetectContentType(pu.Data)
 		// println("detected mimetype to", pu.MimeType)
@@ -60,7 +60,7 @@ func ParseUpload(r *http.Request, sizeLimit int64) (pu *ParsedUpload, e error) {
 		}
 	}
 	if pu.IsGzipped {
-		if unzipped, e := util.UnGzipData(pu.Data); e == nil {
+		if unzipped, e := util.UnCompressData(pu.Data); e == nil {
 			pu.OriginalDataSize = len(unzipped)
 			pu.UncompressedData = unzipped
 			// println("ungzipped data size", len(unzipped))
diff --git a/weed/storage/needle/needle_read_write.go b/weed/storage/needle/needle_read_write.go
index e89e253cd..9702cf939 100644
--- a/weed/storage/needle/needle_read_write.go
+++ b/weed/storage/needle/needle_read_write.go
@@ -13,7 +13,7 @@ import (
 )
 
 const (
-	FlagGzip                = 0x01
+	FlagIsCompressed        = 0x01
 	FlagHasName             = 0x02
 	FlagHasMime             = 0x04
 	FlagHasLastModifiedDate = 0x08
@@ -343,11 +343,11 @@ func (n *Needle) ReadNeedleBodyBytes(needleBody []byte, version Version) (err er
 	return
 }
 
-func (n *Needle) IsGzipped() bool {
-	return n.Flags&FlagGzip > 0
+func (n *Needle) IsCompressed() bool {
+	return n.Flags&FlagIsCompressed > 0
 }
-func (n *Needle) SetGzipped() {
-	n.Flags = n.Flags | FlagGzip
+func (n *Needle) SetIsCompressed() {
+	n.Flags = n.Flags | FlagIsCompressed
 }
 func (n *Needle) HasName() bool {
 	return n.Flags&FlagHasName > 0
diff --git a/weed/topology/store_replicate.go b/weed/topology/store_replicate.go
index 236f8d773..481e72fe0 100644
--- a/weed/topology/store_replicate.go
+++ b/weed/topology/store_replicate.go
@@ -80,7 +80,7 @@ func ReplicatedWrite(masterNode string, s *storage.Store, volumeId needle.Volume
 			}
 
 			// volume server do not know about encryption
-			_, err := operation.UploadData(u.String(), string(n.Name), false, n.Data, n.IsGzipped(), string(n.Mime), pairMap, jwt)
+			_, err := operation.UploadData(u.String(), string(n.Name), false, n.Data, n.IsCompressed(), string(n.Mime), pairMap, jwt)
 			return err
 		}); err != nil {
 			err = fmt.Errorf("failed to write to replicas for volume %d: %v", volumeId, err)
diff --git a/weed/util/compression.go b/weed/util/compression.go
index 1f778b5d5..f6315ebc2 100644
--- a/weed/util/compression.go
+++ b/weed/util/compression.go
@@ -25,7 +25,25 @@ func GzipData(input []byte) ([]byte, error) {
 	}
 	return buf.Bytes(), nil
 }
-func UnGzipData(input []byte) ([]byte, error) {
+func UnCompressData(input []byte) ([]byte, error) {
+	if IsGzippedContent(input) {
+		return ungzipData(input)
+	}
+
+}
+
+func ungzipData(input []byte) ([]byte, error) {
+	buf := bytes.NewBuffer(input)
+	r, _ := gzip.NewReader(buf)
+	defer r.Close()
+	output, err := ioutil.ReadAll(r)
+	if err != nil {
+		glog.V(2).Infoln("error uncompressing data:", err)
+	}
+	return output, err
+}
+
+func ungzipData(input []byte) ([]byte, error) {
 	buf := bytes.NewBuffer(input)
 	r, _ := gzip.NewReader(buf)
 	defer r.Close()
@@ -51,6 +69,13 @@ func IsGzippable(ext, mtype string, data []byte) bool {
 	return isMostlyText
 }
 
+func IsGzippedContent(data []byte) bool {
+	if len(data) < 2 {
+		return false
+	}
+	return data[0] == 31 && data[1] == 139
+}
+
 /*
 * Default more not to gzip since gzip can be done on client side.
  */func IsGzippableFileType(ext, mtype string) (shouldBeZipped, iAmSure bool) {
diff --git a/weed/util/http_util.go b/weed/util/http_util.go
index 5df79a7be..51748e92a 100644
--- a/weed/util/http_util.go
+++ b/weed/util/http_util.go
@@ -189,11 +189,11 @@ func NormalizeUrl(url string) string {
 	return "http://" + url
 }
 
-func ReadUrl(fileUrl string, cipherKey []byte, isGzipped bool, isFullChunk bool, offset int64, size int, buf []byte) (int64, error) {
+func ReadUrl(fileUrl string, cipherKey []byte, isContentCompressed bool, isFullChunk bool, offset int64, size int, buf []byte) (int64, error) {
 
 	if cipherKey != nil {
 		var n int
-		err := readEncryptedUrl(fileUrl, cipherKey, isGzipped, isFullChunk, offset, size, func(data []byte) {
+		err := readEncryptedUrl(fileUrl, cipherKey, isContentCompressed, isFullChunk, offset, size, func(data []byte) {
 			n = copy(buf, data)
 		})
 		return int64(n), err
@@ -300,7 +300,7 @@ func ReadUrlAsStream(fileUrl string, cipherKey []byte, isContentGzipped bool, is
 
 }
 
-func readEncryptedUrl(fileUrl string, cipherKey []byte, isContentGzipped bool, isFullChunk bool, offset int64, size int, fn func(data []byte)) error {
+func readEncryptedUrl(fileUrl string, cipherKey []byte, isContentCompressed bool, isFullChunk bool, offset int64, size int, fn func(data []byte)) error {
 	encryptedData, err := Get(fileUrl)
 	if err != nil {
 		return fmt.Errorf("fetch %s: %v", fileUrl, err)
@@ -309,8 +309,8 @@ func readEncryptedUrl(fileUrl string, cipherKey []byte, isContentGzipped bool, i
 	if err != nil {
 		return fmt.Errorf("decrypt %s: %v", fileUrl, err)
 	}
-	if isContentGzipped {
-		decryptedData, err = UnGzipData(decryptedData)
+	if isContentCompressed {
+		decryptedData, err = UnCompressData(decryptedData)
 		if err != nil {
 			return fmt.Errorf("unzip decrypt %s: %v", fileUrl, err)
 		}