support file names with a comma inside.

go/util/http_util.go

@@ -100,6 +100,7 @@ func DownloadUrl(fileUrl string) (filename string, content []byte, e error) {
 		glog.V(4).Info("Content-Disposition: ", contentDisposition[0])
 		if strings.HasPrefix(contentDisposition[0], "filename=") {
 			filename = contentDisposition[0][len("filename="):]
+			filename = strings.Trim(filename, "\"")
 		}
 	} else {
 		glog.V(4).Info("No Content-Disposition!")

go/weed/weed_server/volume_server_handlers.go

@@ -111,7 +111,7 @@ func (vs *VolumeServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request,
 		w.Header().Set("Content-Type", mtype)
 	}
 	if filename != "" {
-		w.Header().Set("Content-Disposition", "filename="+fileNameEscaper.Replace(filename))
+		w.Header().Set("Content-Disposition", "filename=\""+fileNameEscaper.Replace(filename)+"\"")
 	}
 	if ext != ".gz" {
 		if n.IsGzipped() {