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# v0 API resume endpoint returns inconsistent 500 internal server errors

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2557654557 8388 (@2557654557-8388) · 2026-03-24 · ♥ 1

## Environment

- **API base**: `https://api.v0.dev/v1` 
- **Auth**: `Authorization: Bearer <API_KEY>`
- **SDK**: `v0-sdk` `0.16.2` (also reproduced with a direct `fetch` mirroring the SDK’s streaming headers)

## Endpoint

`POST /v1/chats/{chatId}/messages/{messageId}/resume`

## Request Details

- **Method**: `POST`
- **URL**: `/v1/chats/{chatId}/messages/{messageId}/resume`
- **Headers** (aligned with streaming endpoints such as `sendMessage` + `experimental_stream`):
  - `Authorization: Bearer ***`
  - `Accept: text/event-stream`
  - `Cache-Control: no-cache`
  - `User-Agent: v0-sdk/0.1.0` (or our app user-agent)

No request body.

## Expected Behavior

- If the assistant message is **resumable** (e.g. stream interrupted), the API should return `200` with an `SSE` body (same family as `experimental_stream` on `POST …/messages`).
- If not resumable, the API should return a **clear 4xx** (e.g. `409`/`422`) with a **specific error code/message**, not a generic `500`.

## Actual Behavior

The API returns an **HTTP 500** error with the following response body:

```json
{
  "success": false,
  "error": {
    "type": "internal_server_error",
    "message": "An unexpected error occurred"
  }
}
```

tags: [object Object], [object Object]