rybakovanton-metta opened a new issue, #11513:
URL: https://github.com/apache/cloudstack/issues/11513
### problem
##### ISSUE TYPE
* Bug Report
##### COMPONENT NAME
~~~
UI, Template Upload, Error Handling
~~~
##### SUMMARY
<!-- Explain the problem/feature briefly -->
Template upload shows generic "Request failed with status code 500" error
in UI instead of displaying the actual server error message, making debugging
impossible for users.
### versions
##### CLOUDSTACK VERSION
<!--
New line separated list of affected versions, commit ID for issues on main
branch.
-->
~~~
4.20.1.0
~~~
##### CONFIGURATION
<!--
Information about the configuration if relevant, e.g. basic network,
advanced networking, etc. N/A otherwise
-->
Advanced networking, KVM hypervisor
##### OS / ENVIRONMENT
<!--
Information about the environment if relevant, N/A otherwise
-->
Ubuntu 22.04, KVM hosts
### The steps to reproduce the bug
##### STEPS TO REPRODUCE
<!--
For bugs, show exactly how to reproduce the problem, using a minimal
test-case. Use Screenshots if accurate.
For new features, show how the feature would be used.
-->
<!-- Paste example playbooks or commands between quotes below -->
~~~
1. Go to Templates → Register Template
2. Upload a QCOW2 file that has format detection issues (e.g., with
DOS/MBR boot sector)
3. Select "QCOW2" as format
4. Click Register Template
5. Observe error message in UI
~~~
### What to do about it?
##### EXPECTED RESULTS
<!-- What did you expect to happen when running the steps above? -->
~~~
UI should display the actual error message from server, such as:
"File type mismatch between uploaded file and selected format. Selected
file format: QCOW2. Received: DOS/MBR boot sector, extended partition table
(last)"
~~~
##### ACTUAL RESULTS
<!-- What actually happened? -->
<!-- Paste verbatim command output between quotes below -->
~~~
UI shows useless generic error:
"Upload Failed - Failed to upload Template - Error: Request failed with
status code 500"
Meanwhile server logs show the actual useful error:
2025-08-25 20:53:50,648 WARN [c.c.a.AlertManagerImpl] Template Template
{"format":"QCOW2","id":224,"name":"Ubuntu Server 24.04 Custom"} failed to
upload.
Error details: File type mismatch between uploaded file and selected
format. Selected file format: QCOW2. Received: DOS/MBR boot sector, extended
partition
table (last)
Users are forced to check server logs to understand why uploads fail.
~~~
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