frank-ye opened a new issue, #40828:
URL: https://github.com/apache/airflow/issues/40828
### Apache Airflow version
Other Airflow 2 version (please specify below)
### If "Other Airflow 2 version" selected, which one?
2.9.2
### What happened?
I had a DAG that was missing the `start_date` parameter, and was able to
successfully trigger it. Separately, I tried listing tasks for my application.
When issuing the request (using Astro), I got the following error:
```
{
"detail": "None is not of type 'string'\n\nFailed validating 'type' in
schema['properties']['tasks']['items']['properties']['start_date']:\n
{'format': 'date-time', 'readOnly': True, 'type': 'string'}\n\nOn
instance['tasks'][0]['start_date']:\n None",
"status": 500,
"title": "Response body does not conform to specification",
"type":
"http://apache-airflow-docs.s3-website.eu-central-1.amazonaws.com/docs/apache-airflow/stable/stable-rest-api-ref.html#section/Errors/Unknown";
}
```
After adding back the `start_date` in the DAG params like the following, the
list tasks endpoint returns data again instead of erroring out.
```
default_args = {
'owner': 'airflow',
'depends_on_past': False,
'start_date': datetime(2023, 6, 1),
'retries': 1,
'retry_delay': timedelta(minutes=5),
}
```
### What you think should happen instead?
I don't think the LIST tasks call should fail if the DAG start_time is not
specified.
### How to reproduce
1. Write a simple DAG except omit the `start_time` parameter.
2. Issue a list task request as documented in:
https://airflow.apache.org/docs/apache-airflow/stable/stable-rest-api-ref.html#operation/get_task_instances
### Operating System
MacOS
### Versions of Apache Airflow Providers
_No response_
### Deployment
Astronomer
### Deployment details
_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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