bug: gateway rejected request body before local execution planning

[zzzhouuu]

更新到最新版频繁触发这个导致503,这个body_buffer有环境变量可以增大吗？

2026-08-01 11:50:47.193 +08:00 | WARN     | proxy::body_buffer       - gateway rejected request body before local execution planning | event_name="frontdoor_request_body_buffer_failed" log_type="ops" trace_id="e635875a-5c1f-4d56-8f54-7023b6424853" method="POST" path="/v1/responses" status_code=503 reason="request_body_buffer_overloaded" detail="Request body buffering capacity is temporarily exhausted" read_error="" buffer_requested_bytes=268435456 buffer_budget_bytes=268435456 buffer_queue_timeout_ms=250
2026-08-01 11:50:47.193 +08:00 | WARN     | proxy::finalize          - gateway request failed | event_name="http_request_failed" log_type="access" status="failed" status_code=503 trace_id="e635875a-5c1f-4d56-8f54-7023b6424853" request_id="-" remote_addr="172.16.1.254:40062" method="POST" path="/v1/responses" user_id="e45bafad-8365-4a84-bb86-e42084498b9b" api_key_id="a0a1eb44-a54f-4328-b137-6b78318bad7e" route_class="ai_public" execution_path="local_overloaded" dependency_reason="none" local_execution_runtime_miss_reason="none" elapsed_ms=251