Problem: Unable to download big files from "Review Normalization" panel

[scollazo]

Expected behaviour
When reviewing normalized files, the files can be downloaded

Current behaviour
Downloading a big mp4 file (6gb) shows an internal server error, and the following message in the dashboard log file:

ERROR     2024-02-XX XX:XX:XX  django.request:exception:handle_uncaught_exception:135:  Internal Server Error: /filesystem/download_fs/
Traceback (most recent call last):
  File "/usr/share/archivematica/virtualenvs/archivematica/lib/python3.6/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/usr/share/archivematica/virtualenvs/archivematica/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/share/archivematica/virtualenvs/archivematica/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/opt/archivematica/archivematica/src/dashboard/src/components/filesystem_ajax/views.py", line 1069, in download_fs
    return helpers.send_file(request, requested_filepath)
  File "/opt/archivematica/archivematica/src/dashboard/src/components/helpers.py", line 270, in send_file
    response = HttpResponse(wrapper)
  File "/usr/share/archivematica/virtualenvs/archivematica/lib/python3.6/site-packages/django/http/response.py", line 303, in __init__
    self.content = content
  File "/usr/share/archivematica/virtualenvs/archivematica/lib/python3.6/site-packages/django/http/response.py", line 329, in content
    content = b''.join(self.make_bytes(chunk) for chunk in value)
MemoryError

Steps to reproduce

• Set "Approve normalization" to "None"
• Run a transfer with a big enough file
• In the "Approve normalization" job, click "Review" and try downloading a big file

Your environment (version of Archivematica, operating system, other relevant details)
Ubuntu 20.04 with Archivematica 1.14.1

---

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[scollazo]

As a workaround, the format can be added to a list of formats that are always streamed to the client:

diff --git a/src/dashboard/src/components/helpers.py b/src/dashboard/src/components/helpers.py
index 97e59cdd..d3fc9ff8 100644
--- a/src/dashboard/src/components/helpers.py
+++ b/src/dashboard/src/components/helpers.py
@@ -270,7 +270,7 @@ def send_file(request, filepath, force_download=False):
     response = HttpResponse(wrapper)
 
     # force download for certain filetypes
-    extensions_to_download = [".7z", ".zip"]
+    extensions_to_download = [".7z", ".zip", ".mp4"]
 
     if force_download or (extension in extensions_to_download):
         response["Content-Type"] = "application/force-download"