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Steps to reproduce

Create a file locally with a filename that includes spaces, e. g. Foo Bar.txt
Use Firefox
Store the file as a process variable
Download the file e.g., via GET /variable-instance/[VARIABLE_INSTANCE_ID]/data and store it on your local machine

Expected behavior

When you check your download folder, the file should be stored as Foo Bar.txt

Observed behavior

The file is stored as Foo

Problem

The content-disposition header looks as follows:

Content-Disposition: attachment; filename=Foo Bar.bpmn

Solution

The filename in the content-disposition header should be a double-quoted string:

Content-Disposition: attachment; filename="Foo Bar.bpmn"

Hints

is related to

CAM-10472 In the REST API, the file name in the content-disposition header can be ill-formatted

Lack of URL Encoding while downloading files truncates file names when they contain spaces