[GH-ISSUE #970] Attachments downloading as 4 byte files (contains the word 'null') #689

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opened 2026-03-03 02:02:13 +03:00 by kerem · 2 comments

kerem commented

2026-03-03 02:02:13 +03:00

Owner

Originally created by @jph on GitHub (Apr 17, 2020).
Original GitHub issue: https://github.com/dani-garcia/vaultwarden/issues/970

Subject of the issue

When attempting to download an attachment, I instead get a 4 byte file that contains the word 'null'.

Your environment

Bitwarden_rs version: Version: 1.14.2-5a390a97

Install method: Docker image
Clients used: Browser
Reverse proxy and version: Caddy*
Version of mysql/postgresql:
Other relevant information:

Steps to reproduce

Nothing configured away from the default - it's docker & caddy for SSL. Admin panel is enabled.
Steps: Attempt to download an attachment.

Expected behaviour

I should receive a decrypted attachment

Actual behaviour

I get a 4 byte file with 'null' as the content.

Relevant logs

Bitwarden logs don't seem to indicate an issue:

[2020-04-17 23:15:46][request][INFO] GET /attachments/8befdbdf-1eeb-4533-acee-47662ea50579/9caf8bda3da6a35d1316
[2020-04-17 23:15:46][response][INFO] GET /attachments/<uuid>/<file..> (attachments) => 200 OK

Update: grabbed the Caddy (proxy) logs too, and found something interesting.

[IP ADDRESS] - - [18/Apr/2020:23:20:07 +0000] "GET /attachments/8befdbdf-1eeb-4533-acee-47662ea50579/9caf8bda3da6a35d1316 HTTP/2.0" 200 1181

The Caddy logs indicate the body size is 1181 bytes - almost exactly matching the filesize I've attempted to download. Further testing indicates this is indeed the case - below you can find a log of a 5mb attachment download.

[IP ADDRESS] - - [18/Apr/2020:23:22:02 +0000] "GET /attachments/8befdbdf-1eeb-4533-acee-47662ea50579/165361be8425bd69e867 HTTP/2.0" 200 5982060

But as you can see below, downloaded file size differs from the reported file size in Bitwarden.

Originally created by @jph on GitHub (Apr 17, 2020). Original GitHub issue: https://github.com/dani-garcia/vaultwarden/issues/970  ### Subject of the issue When attempting to download an attachment, I instead get a 4 byte file that contains the word 'null'. ### Your environment  * Bitwarden_rs version: Version: 1.14.2-5a390a97  * Install method: Docker image * Clients used:  Browser * Reverse proxy and version:  Caddy* * Version of mysql/postgresql:  * Other relevant information: ### Steps to reproduce  Nothing configured away from the default - it's docker & caddy for SSL. Admin panel is enabled. Steps: Attempt to download an attachment. ### Expected behaviour I should receive a decrypted attachment ### Actual behaviour I get a 4 byte file with 'null' as the content. ### Relevant logs Bitwarden logs don't seem to indicate an issue: ``` [2020-04-17 23:15:46][request][INFO] GET /attachments/8befdbdf-1eeb-4533-acee-47662ea50579/9caf8bda3da6a35d1316 [2020-04-17 23:15:46][response][INFO] GET /attachments/<uuid>/<file..> (attachments) => 200 OK ``` Update: grabbed the Caddy (proxy) logs too, and found something interesting. ``` [IP ADDRESS] - - [18/Apr/2020:23:20:07 +0000] "GET /attachments/8befdbdf-1eeb-4533-acee-47662ea50579/9caf8bda3da6a35d1316 HTTP/2.0" 200 1181 ``` The Caddy logs indicate the body size is 1181 bytes - almost exactly matching the filesize I've attempted to download. Further testing indicates this is indeed the case - below you can find a log of a 5mb attachment download. ``` [IP ADDRESS] - - [18/Apr/2020:23:22:02 +0000] "GET /attachments/8befdbdf-1eeb-4533-acee-47662ea50579/165361be8425bd69e867 HTTP/2.0" 200 5982060 ``` But as you can see below, downloaded file size differs from the reported file size in Bitwarden.  ![image](https://user-images.githubusercontent.com/155770/79620871-ccb6f600-8154-11ea-87de-bb0905b66277.png) ![image](https://user-images.githubusercontent.com/155770/79620880-d5a7c780-8154-11ea-9112-9451b1ede811.png)

kerem closed this issue

2026-03-03 02:02:13 +03:00

kerem commented

2026-03-03 02:02:14 +03:00

Author

Owner

@dani-garcia commented on GitHub (Apr 17, 2020):

Other user had this problem when enabling caddy gzip compression so check if you have it enabled and disable it if that’s the case.

https://bitwardenrs.discourse.group/t/downloading-attachment-in-firefox/62/14

@dani-garcia commented on GitHub (Apr 17, 2020): Other user had this problem when enabling caddy gzip compression so check if you have it enabled and disable it if that’s the case. https://bitwardenrs.discourse.group/t/downloading-attachment-in-firefox/62/14

kerem commented

2026-03-03 02:02:14 +03:00

Author

Owner

@jph commented on GitHub (Apr 18, 2020):

It's as simple as that. My mistake, I didn't actually search the Discourse group. At least it's here now if anybody searches for it.

Thank you @dani-garcia for the quick reply. :)

@jph commented on GitHub (Apr 18, 2020): It's as simple as that. My mistake, I didn't actually search the Discourse group. At least it's here now if anybody searches for it. Thank you @dani-garcia for the quick reply. :)