YoannAbriel opened a new pull request, #63215:
URL: https://github.com/apache/airflow/pull/63215
## Problem
Task subprocesses get killed with SIGKILL immediately after starting. The
API server returns 422 on `PATCH /execution/task-instances/{id}/run` because
the request body is received as a raw string instead of parsed JSON.
## Root Cause
`client.py` uses httpx's `content=body.model_dump_json()` to send requests.
The `content=` parameter sets the raw body but does not set a `Content-Type`
header — so the API server (cadwyn/FastAPI) can't identify the payload as JSON,
passes it to Pydantic as a plain string, and rejects it with a
`model_attributes_type` validation error.
## Fix
Added `content-type: application/json` to the default headers in
`Client.__init__()`. This covers all call sites that use `content=` (start,
heartbeat, state transitions, etc.) without touching each one individually.
Added a test that verifies the header is present on outgoing requests.
Closes: #63209
<!-- SPDX-License-Identifier: Apache-2.0
https://www.apache.org/licenses/LICENSE-2.0 -->
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes — Claude Code
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