v0 API resume endpoint returns inconsistent 500 internal server errors

v0
,
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:

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

tags: [object Object], [object Object]

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