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Permission denied on some private files, even though access is permitted

Drupal 9.3

We have a site that allows private file uploads. We get intermittent files that cannot be viewed/downloaded, even with the "User 1" account.

There is no difference between a denied file and other files that can be viewed. The file exists in the Drupal Files Views and is used in 1 place as expected. The file exists on the server and has the same UNIX permissions.

Troubleshooting shows the Access Denied error coming from the download function in:

/web/core/modules/system/src/FileDownloadController.php

It appears that a header is getting set to -1 somewhere so I tried using hook_file_download() in a custom module with its weight set to 100 so it should fire last.

What’s baffling me is that my hook is ran last by weight and the "-1" is not in the $headers but when FileDownloadController’s download function checks it it is there.

The screenshot show dpm($headers) from my hook_download_file() that runs first and then the core download function. Where is the -1 being inserted and why is it intermittent?

enter image description here

This article was republished from its original source.
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Permission denied on some private files, even though access is permitted

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