beego: fix #478

@@ -237,10 +237,14 @@ func (output *BeegoOutput) Xml(data interface{}, hasIndent bool) error {
 
 
 // Download forces response for download file.
 // Download forces response for download file.
 // it prepares the download response header automatically.
 // it prepares the download response header automatically.
-func (output *BeegoOutput) Download(file string) {
+func (output *BeegoOutput) Download(file string, filename ...string) {
 	output.Header("Content-Description", "File Transfer")
 	output.Header("Content-Description", "File Transfer")
 	output.Header("Content-Type", "application/octet-stream")
 	output.Header("Content-Type", "application/octet-stream")
+	if len(filename) > 0 && filename[0] != "" {
+		output.Header("Content-Disposition", "attachment; filename="+filename[0])
+	} else {
 		output.Header("Content-Disposition", "attachment; filename="+filepath.Base(file))
 		output.Header("Content-Disposition", "attachment; filename="+filepath.Base(file))
+	}
 	output.Header("Content-Transfer-Encoding", "binary")
 	output.Header("Content-Transfer-Encoding", "binary")
 	output.Header("Expires", "0")
 	output.Header("Expires", "0")
 	output.Header("Cache-Control", "must-revalidate")
 	output.Header("Cache-Control", "must-revalidate")