mohanakrishnan0592 opened a new issue, #68868:
URL: https://github.com/apache/airflow/issues/68868
### Under which category would you file this issue?
Providers
### Apache Airflow version
3.2.2
### What happened and how to reproduce it?
## Summary
When trying to edit and save Airflow variables using the Web UI, the save
operation fails with an HTTP 500 Internal Server Error. The native CLI works
perfectly, indicating a strict mismatch between the frontend UI payload and the
Airflow 3 backend API schemas.
## Root Cause Analysis
1. **Frontend Payload:** The UI transmits `"team_name": ""` in the JSON
request body when saving a variable.
2. **Backend Datamodel:** In Airflow 3, the `VariableBody` schema explicitly
defines `team_name` as an optional string property.
3. **The Crash:** When multi-team features are disabled in the backend
environment, passing an empty string (`""`) instead of `null` triggers an
internal exception.
4. **Middleware Masking:** This exception is intercepted by the
`refresh_token.py` authentication middleware, which fails to return a clean
validation response and instead throws an unhandled `RuntimeError: No response
returned`, masking the underlying failure as a generic 500 error.
## Steps to Reproduce
1. Navigate to the Airflow Web UI -> Variables list.
2. Click **Edit** on an existing variable which is created before the
version upgrade, modify the value, and click **Save**.
3. Inspect the outbound browser network request to verify the payload
contains `"team_name": ""`.
## Relevant Logs (API Server)
```text
2026-06-22T15:04:14.575405Z [error ] Exception in ASGI application
[uvicorn.error] loc=httptools_impl.py:426
+ Exception Group Traceback (most recent call last):
| File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py",
line 81, in collapse_excgroups
| yield
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
192, in __call__
| async with anyio.create_task_group() as task_group:
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line
811, in __aexit__
| raise BaseExceptionGroup(
| ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File
"/home/airflow/.local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 421, in run_asgi
| result = await app( # type: ignore[func-returns-value]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1159, in __call__
| await super().__call__(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/applications.py", line 90,
in __call__
| await self.middleware_stack(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
186, in __call__
| raise exc
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
164, in __call__
| await self.app(scope, receive, _send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/common/http_access_log.py",
line 83, in __call__
| await self.app(scope, receive, capture_send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
29, in __call__
| await responder(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
130, in __call__
| await super().__call__(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
46, in __call__
| await self.app(scope, receive, self.send_with_compression)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
191, in __call__
| with recv_stream, send_stream, collapse_excgroups():
| ^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/contextlib.py", line 158, in __exit__
| self.gen.throw(value)
| File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py",
line 87, in collapse_excgroups
| raise exc
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
193, in __call__
| response = await self.dispatch_func(request, call_next)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/auth/middlewares/refresh_token.py",
line 61, in dispatch
| response = await call_next(request)
| ^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
169, in call_next
| raise RuntimeError("No response returned.")
| RuntimeError: No response returned.
+------------------------------------
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 421, in run_asgi
result = await app( # type: ignore[func-returns-value]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1159, in __call__
await super().__call__(scope, receive, send)
File "/usr/local/lib/python3.12/site-packages/starlette/applications.py",
line 90, in __call__
await self.middleware_stack(scope, receive, send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
186, in __call__
raise exc
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
164, in __call__
await self.app(scope, receive, _send)
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/common/http_access_log.py",
line 83, in __call__
await self.app(scope, receive, capture_send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
29, in __call__
await responder(scope, receive, send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
130, in __call__
await super().__call__(scope, receive, send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
46, in __call__
await self.app(scope, receive, self.send_with_compression)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
191, in __call__
with recv_stream, send_stream, collapse_excgroups():
^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/contextlib.py", line 158, in __exit__
self.gen.throw(value)
File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py", line
87, in collapse_excgroups
raise exc
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
193, in __call__
response = await self.dispatch_func(request, call_next)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/auth/middlewares/refresh_token.py",
line 61, in dispatch
response = await call_next(request)
^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
169, in call_next
raise RuntimeError("No response returned.")
RuntimeError: No response returned.
2026-06-22T15:04:15.616257Z [error ] Exception in ASGI application
[uvicorn.error] loc=httptools_impl.py:426
+ Exception Group Traceback (most recent call last):
| File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py",
line 81, in collapse_excgroups
| yield
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
192, in __call__
| async with anyio.create_task_group() as task_group:
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line
811, in __aexit__
| raise BaseExceptionGroup(
| ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File
"/home/airflow/.local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 421, in run_asgi
| result = await app( # type: ignore[func-returns-value]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1159, in __call__
| await super().__call__(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/applications.py", line 90,
in __call__
| await self.middleware_stack(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
186, in __call__
| raise exc
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
164, in __call__
| await self.app(scope, receive, _send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/common/http_access_log.py",
line 83, in __call__
| await self.app(scope, receive, capture_send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
29, in __call__
| await responder(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
130, in __call__
| await super().__call__(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
46, in __call__
| await self.app(scope, receive, self.send_with_compression)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
191, in __call__
| with recv_stream, send_stream, collapse_excgroups():
| ^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/contextlib.py", line 158, in __exit__
| self.gen.throw(value)
| File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py",
line 87, in collapse_excgroups
| raise exc
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
193, in __call__
| response = await self.dispatch_func(request, call_next)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/auth/middlewares/refresh_token.py",
line 61, in dispatch
| response = await call_next(request)
| ^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
169, in call_next
| raise RuntimeError("No response returned.")
| RuntimeError: No response returned.
+------------------------------------
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 421, in run_asgi
result = await app( # type: ignore[func-returns-value]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1159, in __call__
await super().__call__(scope, receive, send)
File "/usr/local/lib/python3.12/site-packages/starlette/applications.py",
line 90, in __call__
await self.middleware_stack(scope, receive, send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
186, in __call__
raise exc
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
164, in __call__
await self.app(scope, receive, _send)
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/common/http_access_log.py",
line 83, in __call__
await self.app(scope, receive, capture_send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
29, in __call__
await responder(scope, receive, send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
130, in __call__
await super().__call__(scope, receive, send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
46, in __call__
await self.app(scope, receive, self.send_with_compression)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
191, in __call__
with recv_stream, send_stream, collapse_excgroups():
^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/contextlib.py", line 158, in __exit__
self.gen.throw(value)
File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py", line
87, in collapse_excgroups
raise exc
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
193, in __call__
response = await self.dispatch_func(request, call_next)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/auth/middlewares/refresh_token.py",
line 61, in dispatch
response = await call_next(request)
^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
169, in call_next
raise RuntimeError("No response returned.")
RuntimeError: No response returned.
2026-06-22T15:04:17.648490Z [error ] Exception in ASGI application
[uvicorn.error] loc=httptools_impl.py:426
+ Exception Group Traceback (most recent call last):
| File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py",
line 81, in collapse_excgroups
| yield
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
192, in __call__
| async with anyio.create_task_group() as task_group:
| ^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/usr/local/lib/python3.12/site-packages/anyio/_backends/_asyncio.py", line
811, in __aexit__
| raise BaseExceptionGroup(
| ExceptionGroup: unhandled errors in a TaskGroup (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File
"/home/airflow/.local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 421, in run_asgi
| result = await app( # type: ignore[func-returns-value]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1159, in __call__
| await super().__call__(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/applications.py", line 90,
in __call__
| await self.middleware_stack(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
186, in __call__
| raise exc
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
164, in __call__
| await self.app(scope, receive, _send)
| File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/common/http_access_log.py",
line 83, in __call__
| await self.app(scope, receive, capture_send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
29, in __call__
| await responder(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
130, in __call__
| await super().__call__(scope, receive, send)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
46, in __call__
| await self.app(scope, receive, self.send_with_compression)
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
191, in __call__
| with recv_stream, send_stream, collapse_excgroups():
| ^^^^^^^^^^^^^^^^^^^^
| File "/usr/local/lib/python3.12/contextlib.py", line 158, in __exit__
| self.gen.throw(value)
| File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py",
line 87, in collapse_excgroups
| raise exc
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
193, in __call__
| response = await self.dispatch_func(request, call_next)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/auth/middlewares/refresh_token.py",
line 61, in dispatch
| response = await call_next(request)
| ^^^^^^^^^^^^^^^^^^^^^^^^
| File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
169, in call_next
| raise RuntimeError("No response returned.")
| RuntimeError: No response returned.
+------------------------------------
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/home/airflow/.local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py",
line 421, in run_asgi
result = await app( # type: ignore[func-returns-value]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/fastapi/applications.py",
line 1159, in __call__
await super().__call__(scope, receive, send)
File "/usr/local/lib/python3.12/site-packages/starlette/applications.py",
line 90, in __call__
await self.middleware_stack(scope, receive, send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
186, in __call__
raise exc
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line
164, in __call__
await self.app(scope, receive, _send)
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/common/http_access_log.py",
line 83, in __call__
await self.app(scope, receive, capture_send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
29, in __call__
await responder(scope, receive, send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
130, in __call__
await super().__call__(scope, receive, send)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/gzip.py", line
46, in __call__
await self.app(scope, receive, self.send_with_compression)
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
191, in __call__
with recv_stream, send_stream, collapse_excgroups():
^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/contextlib.py", line 158, in __exit__
self.gen.throw(value)
File "/usr/local/lib/python3.12/site-packages/starlette/_utils.py", line
87, in collapse_excgroups
raise exc
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
193, in __call__
response = await self.dispatch_func(request, call_next)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File
"/home/airflow/.local/lib/python3.12/site-packages/airflow/api_fastapi/auth/middlewares/refresh_token.py",
line 61, in dispatch
response = await call_next(request)
^^^^^^^^^^^^^^^^^^^^^^^^
File
"/usr/local/lib/python3.12/site-packages/starlette/middleware/base.py", line
169, in call_next
raise RuntimeError("No response returned.")
RuntimeError: No response returned.
### What you think should happen instead?
_No response_
### Operating System
_No response_
### Deployment
None
### Apache Airflow Provider(s)
_No response_
### Versions of Apache Airflow Providers
_No response_
### Official Helm Chart version
Not Applicable
### Kubernetes Version
_No response_
### Helm Chart configuration
_No response_
### Docker Image customizations
_No response_
### Anything else?
_No response_
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [x] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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