to force 'download as attachment' should not be a part of index_html API, and...

to force 'download as attachment' should not be a part of index_html API, and we already have this logic in Base_download script.

product/ERP5/mixin/downloadable.py

@@ -104,12 +104,6 @@ class DownloadableMixin:
       RESPONSE.setHeader('Content-Type', '%s; charset=utf-8' % mime)
     else:
       RESPONSE.setHeader('Content-Type', mime)
-    if output_format not in (VALID_TEXT_FORMAT_LIST + VALID_IMAGE_FORMAT_LIST):
-      # need to return it as attachment
-      filename = self.getStandardFilename(format=format)
-      RESPONSE.setHeader('Content-Disposition',
-                         'attachment; filename="%s"' % filename)
-      RESPONSE.setHeader('Accept-Ranges', 'bytes')
     return str(data)
 
   security.declareProtected(Permissions.AccessContentsInformation,