2 files changed, 42 insertions, 14 deletions
diff --git a/weed/operation/compress.go b/weed/operation/compress.go
index fedc877dd..a28fb33ec 100644
--- a/weed/operation/compress.go
+++ b/weed/operation/compress.go
@@ -16,45 +16,58 @@ import (
  */
 func IsGzippable(ext, mtype string, data []byte) bool {
 
+	shouldBeZipped, iAmSure := IsGzippableFileType(ext, mtype)
+	if iAmSure {
+		return shouldBeZipped
+	}
+
+	isMostlyText := util.IsText(data)
+
+	return isMostlyText
+}
+
+/*
+* Default more not to gzip since gzip can be done on client side.
+ */
+func IsGzippableFileType(ext, mtype string) (shouldBeZipped, iAmSure bool) {
+
 	// text
 	if strings.HasPrefix(mtype, "text/") {
-		return true
+		return true, true
 	}
 
 	// images
 	switch ext {
 	case ".svg", ".bmp":
-		return true
+		return true, true
 	}
 	if strings.HasPrefix(mtype, "image/") {
-		return false
+		return false, true
 	}
 
 	// by file name extension
 	switch ext {
 	case ".zip", ".rar", ".gz", ".bz2", ".xz":
-		return false
+		return false, true
 	case ".pdf", ".txt", ".html", ".htm", ".css", ".js", ".json":
-		return true
+		return true, true
 	case ".php", ".java", ".go", ".rb", ".c", ".cpp", ".h", ".hpp":
-		return true
+		return true, true
 	case ".png", ".jpg", ".jpeg":
-		return false
+		return false, true
 	}
 
 	// by mime type
 	if strings.HasPrefix(mtype, "application/") {
 		if strings.HasSuffix(mtype, "xml") {
-			return true
+			return true, true
 		}
 		if strings.HasSuffix(mtype, "script") {
-			return true
+			return true, true
 		}
 	}
 
-	isMostlyText := util.IsText(data)
-
-	return isMostlyText
+	return false, false
 }
 
 func GzipData(input []byte) ([]byte, error) {
diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index 2276c67b7..6bd299826 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -2,6 +2,7 @@ package operation
 
 import (
 	"bytes"
+	"compress/gzip"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -39,10 +40,24 @@ var fileNameEscaper = strings.NewReplacer("\\", "\\\\", "\"", "\\\"")
 
 // Upload sends a POST request to a volume server to upload the content
 func Upload(uploadUrl string, filename string, reader io.Reader, isGzipped bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (*UploadResult, error) {
+	contentIsGzipped := isGzipped
+	shouldGzipNow := false
+	if !isGzipped {
+		if shouldBeZipped, iAmSure := IsGzippableFileType(filepath.Base(filename), mtype); iAmSure && shouldBeZipped {
+			shouldGzipNow = true
+			contentIsGzipped = true
+		}
+	}
 	return upload_content(uploadUrl, func(w io.Writer) (err error) {
-		_, err = io.Copy(w, reader)
+		if shouldGzipNow {
+			gzWriter := gzip.NewWriter(w)
+			_, err = io.Copy(gzWriter, reader)
+			gzWriter.Close()
+		} else {
+			_, err = io.Copy(w, reader)
+		}
 		return
-	}, filename, isGzipped, mtype, pairMap, jwt)
+	}, filename, contentIsGzipped, mtype, pairMap, jwt)
 }
 func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error, filename string, isGzipped bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (*UploadResult, error) {
 	body_buf := bytes.NewBufferString("")