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[GH-ISSUE #2181] S3 Error handling on upload and XAmzContentSHA256Mismatch: UnknownError #6579

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opened 2026-04-20 17:10:47 -05:00 by GiteaMirror · 2 comments
GiteaMirror commented 2026-04-20 17:10:47 -05:00
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Originally created by @damienalexandre on GitHub (Jan 30, 2026).
Original GitHub issue: https://github.com/go-vikunja/vikunja/issues/2181

Pre-submission checklist

  • I have searched for existing open or closed issue reports with the same problem.

Description

Hello, firstly let me say thanks for this awesome software and congrats for the 1.0 release 🎉

I needed the S3 file storage capability so much! But I struggle to make it work with an S3 compatible storage called Cellar : https://www.clever.cloud/developers/doc/addons/cellar/

It fails to upload and there are two issues.

1. No error are reported to the end user

When I upload I get no UI change, and I can see the backend answer a 200 with this payload:

{"errors":[{"message":"failed to save file: failed to upload file to S3: operation error S3: PutObject, https response error StatusCode: 400, RequestID: tx0000048737b190960b123-00697d0a33-11b44b19-default, HostID: 11b44b19-default-default, api error XAmzContentSHA256Mismatch: UnknownError"}],"success":null}

Unless I open the console I have no way to know that something wrong happened.

Image

2. XAmzContentSHA256Mismatch?

I don't know where this error is from, is it from Cellar API?

operation error S3: PutObject
https response error StatusCode: 400
api error XAmzContentSHA256Mismatch: UnknownError

The recommended s3cfg is this, I don't know if it can help.

access_key = XXX
secret_key = XXX
bucket_location = US
cloudfront_host = cloudfront.amazonaws.com
cloudfront_resource = /2010-07-15/distribution
default_mime_type = binary/octet-stream
delete_removed = False
dry_run = False
encoding = UTF-8
encrypt = False
follow_symlinks = False
force = False
get_continue = False
gpg_command = /usr/bin/gpg
gpg_decrypt = %(gpg_command)s -d --verbose --no-use-agent --batch --yes --passphrase-fd %(passphrase_fd)s -o %(output_file)s %(input_file)s
gpg_encrypt = %(gpg_command)s -c --verbose --no-use-agent --batch --yes --passphrase-fd %(passphrase_fd)s -o %(output_file)s %(input_file)s
gpg_passphrase =
guess_mime_type = True
host_base = cellar-fr-north-hds-c1.services.clever-cloud.com
host_bucket = %(bucket)s.cellar-fr-north-hds-c1.services.clever-cloud.com
human_readable_sizes = False
list_md5 = False
log_target_prefix =
preserve_attrs = True
progress_meter = True
proxy_host =
proxy_port = 0
recursive = False
recv_chunk = 4096
reduced_redundancy = False
send_chunk = 4096
signurl_use_https = True
simpledb_host = sdb.amazonaws.com
skip_existing = False
socket_timeout = 300
urlencoding_mode = normal
use_https = True
verbosity = WARNING

Vikunja Version

1.0.0

Browser and version

Firefox

Can you reproduce the bug on the Vikunja demo site?

No

Screenshots

No response

Originally created by @damienalexandre on GitHub (Jan 30, 2026). Original GitHub issue: https://github.com/go-vikunja/vikunja/issues/2181 ### Pre-submission checklist - [x] I have searched for existing open or closed issue reports with the same problem. ### Description Hello, firstly let me say thanks for this awesome software and congrats for the 1.0 release 🎉 I needed the S3 file storage capability so much! But I struggle to make it work with an S3 compatible storage called Cellar : https://www.clever.cloud/developers/doc/addons/cellar/ It fails to upload and there are two issues. # 1. No error are reported to the end user When I upload I get no UI change, and I can see the backend answer a 200 with this payload: > {"errors":[{"message":"failed to save file: failed to upload file to S3: operation error S3: PutObject, https response error StatusCode: 400, RequestID: tx0000048737b190960b123-00697d0a33-11b44b19-default, HostID: 11b44b19-default-default, api error XAmzContentSHA256Mismatch: UnknownError"}],"success":null} Unless I open the console I have no way to know that something wrong happened. <img width="914" height="404" alt="Image" src="https://github.com/user-attachments/assets/51022448-e5b2-45be-8984-ac49ead07d99" /> # 2. XAmzContentSHA256Mismatch? I don't know where this error is from, is it from Cellar API? > operation error S3: PutObject > https response error StatusCode: 400 > api error XAmzContentSHA256Mismatch: UnknownError The recommended s3cfg is this, I don't know if it can help. ``` access_key = XXX secret_key = XXX bucket_location = US cloudfront_host = cloudfront.amazonaws.com cloudfront_resource = /2010-07-15/distribution default_mime_type = binary/octet-stream delete_removed = False dry_run = False encoding = UTF-8 encrypt = False follow_symlinks = False force = False get_continue = False gpg_command = /usr/bin/gpg gpg_decrypt = %(gpg_command)s -d --verbose --no-use-agent --batch --yes --passphrase-fd %(passphrase_fd)s -o %(output_file)s %(input_file)s gpg_encrypt = %(gpg_command)s -c --verbose --no-use-agent --batch --yes --passphrase-fd %(passphrase_fd)s -o %(output_file)s %(input_file)s gpg_passphrase = guess_mime_type = True host_base = cellar-fr-north-hds-c1.services.clever-cloud.com host_bucket = %(bucket)s.cellar-fr-north-hds-c1.services.clever-cloud.com human_readable_sizes = False list_md5 = False log_target_prefix = preserve_attrs = True progress_meter = True proxy_host = proxy_port = 0 recursive = False recv_chunk = 4096 reduced_redundancy = False send_chunk = 4096 signurl_use_https = True simpledb_host = sdb.amazonaws.com skip_existing = False socket_timeout = 300 urlencoding_mode = normal use_https = True verbosity = WARNING ``` ### Vikunja Version 1.0.0 ### Browser and version Firefox ### Can you reproduce the bug on the Vikunja demo site? No ### Screenshots _No response_
GiteaMirror commented 2026-04-20 17:10:49 -05:00
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@kolaente commented on GitHub (Feb 8, 2026):

Upload error logs will be fixed in https://github.com/go-vikunja/vikunja/pull/2204

<!-- gh-comment-id:3867325162 --> @kolaente commented on GitHub (Feb 8, 2026): Upload error logs will be fixed in https://github.com/go-vikunja/vikunja/pull/2204
GiteaMirror commented 2026-04-20 17:10:50 -05:00
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@kolaente commented on GitHub (Feb 8, 2026):

https://github.com/go-vikunja/vikunja/pull/2205 should resolve the other problem - it adds a new option to disable file signing, which seems to be the problem here.

I have no way to test this with Cellar and their implementation seems to do things differently here. Please report back if it works with that.

<!-- gh-comment-id:3867342176 --> @kolaente commented on GitHub (Feb 8, 2026): https://github.com/go-vikunja/vikunja/pull/2205 should resolve the other problem - it adds a new option to disable file signing, which seems to be the problem here. I have no way to test this with Cellar and their implementation seems to do things differently here. Please report back if it works with that.
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Reference: github-starred/vikunja#6579
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