---
title: "Changes to Send a message inside a webchat side thread"
method: POST
path: "/api/v1/chat/threads/{thread_id}/messages"
---

# Changes to Send a message inside a webchat side thread

`POST /api/v1/chat/threads/{thread_id}/messages`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 5 of 23 revisions.

- **2026-10-11** `6bc2d8e1dc88`: 1 info
- **2026-09-10** `c98aa2f4c72d`: 1 info
- **2026-07-18** `dcaea15b7823`: 3 info
- **2026-06-14** `6b73b947caab`: 1 info
- **2026-03-09** `3d43cee2622a`: 1 breaking

## Changes

- **2026-10-11** `6bc2d8e1dc88`: 1 info
  - added the new optional request property `locale`
- **2026-09-10** `c98aa2f4c72d`: 1 info
  - added the new optional request property `flags/enable_reasoning`
- **2026-07-18** `dcaea15b7823`: 3 info
  - added the new optional request property `flags`
  - added the new optional request property `message/oneOf[subschema #2]/items/stored_filename`
  - request property `enable_streaming` deprecated
- **2026-06-14** `6b73b947caab`: 1 info
  - endpoint added
- **2026-03-09** `3d43cee2622a`: 1 breaking
  - api path removed without deprecation

---

[Operation](https://skmtc.dev/astrbotdevs/apis/astrbot-openapi-v1/docs/api/v1/chat/threads/:thread_id/messages/post.md) - [API](https://skmtc.dev/astrbotdevs/apis/astrbot-openapi-v1.md) - [Page](https://skmtc.dev/astrbotdevs/apis/astrbot-openapi-v1/changes/api/v1/chat/threads/:thread_id/messages/post)