diff --git a/weed-fs/src/pkg/storage/compress.go b/weed-fs/src/pkg/storage/compress.go
index 419cde8ff..9df85b4da 100644
--- a/weed-fs/src/pkg/storage/compress.go
+++ b/weed-fs/src/pkg/storage/compress.go
@@ -1,49 +1,69 @@
 package storage
 
 import (
-  "bytes"
-  "compress/flate"
-  "compress/gzip"
-  "io/ioutil"
-  "strings"
+	"bytes"
+	"compress/flate"
+	"compress/gzip"
+	"io/ioutil"
+	"strings"
 )
 
+/*
+* Default more not to gzip since gzip can be done on client side.
+*/
 func IsGzippable(ext, mtype string) bool {
-  if ext == ".zip" {
-    return false
-  }
-  if ext == ".rar" {
-    return false
-  }
-  if ext == ".gz" {
-    return false
-  }
-  if strings.Index(mtype,"text/")==0 {
-    return true
-  }
-  if strings.Index(mtype,"application/")==0 {
-    return true
-  }
-  return false
+    if strings.HasPrefix(mtype, "text/"){
+        return true
+    }
+	if ext == ".zip" {
+		return false
+	}
+	if ext == ".rar" {
+		return false
+	}
+	if ext == ".gz" {
+		return false
+	}
+	if ext == ".pdf" {
+		return true
+	}
+	if ext == ".css" {
+		return true
+	}
+	if ext == ".js" {
+		return true
+	}
+    if ext == ".json" {
+        return true
+    }
+	if strings.HasPrefix(mtype, "application/") {
+		if strings.HasSuffix(mtype, "xml") {
+			return true
+		}
+		if strings.HasSuffix(mtype, "script") {
+			return true
+		}
+	}
+	return false
 }
 func GzipData(input []byte) []byte {
-  buf := new(bytes.Buffer)
-  w, _ := gzip.NewWriterLevel(buf, flate.BestCompression)
-  if _, err := w.Write(input); err!=nil {
-    println("error compressing data:", err)
-  }
-  if err := w.Close(); err!=nil {
-    println("error closing compressed data:", err)
-  }
-  return buf.Bytes()
+	buf := new(bytes.Buffer)
+	w, _ := gzip.NewWriterLevel(buf, flate.BestCompression)
+	if _, err := w.Write(input); err != nil {
+		println("error compressing data:", err)
+	}
+	if err := w.Close(); err != nil {
+		println("error closing compressed data:", err)
+	}
+	return buf.Bytes()
 }
 func UnGzipData(input []byte) []byte {
-  buf := bytes.NewBuffer(input)
-  r, _ := gzip.NewReader(buf)
-  defer r.Close()
-  output, err := ioutil.ReadAll(r)
-  if err!=nil {
-    println("error uncompressing data:", err)
-  }
-  return output
+	buf := bytes.NewBuffer(input)
+	r, _ := gzip.NewReader(buf)
+	defer r.Close()
+	output, err := ioutil.ReadAll(r)
+	if err != nil {
+		println("error uncompressing data:", err)
+	}
+	return output
 }