micro/go-micro · error

tasks/resubscribe: status %d

Error message

tasks/resubscribe: status %d

What it means

The resubscribe stream method performs an HTTP POST to tasks/resubscribe and expects 200 OK before reading the SSE body. The library throws this error into the error channel when the HTTP status is not 200, meaning the server refused to reopen the event stream for the task. No events will follow; consumers should treat the stream as closed.

Source

Thrown at gateway/a2a/client.go:170

			"id":      uuid.New().String(),
			"method":  "tasks/resubscribe",
			"params":  getParams{ID: taskID},
		})
		req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.url, bytes.NewReader(body))
		if err != nil {
			errs <- err
			return
		}
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Accept", "text/event-stream")
		resp, err := c.http.Do(req)
		if err != nil {
			errs <- err
			return
		}
		defer resp.Body.Close()
		if resp.StatusCode != http.StatusOK {
			errs <- fmt.Errorf("tasks/resubscribe: status %d", resp.StatusCode)
			return
		}
		scanner := bufio.NewScanner(resp.Body)
		for scanner.Scan() {
			line := scanner.Text()
			if !strings.HasPrefix(line, "data:") {
				continue
			}
			payload := strings.TrimSpace(strings.TrimPrefix(line, "data:"))
			if payload == "" {
				continue
			}
			var out struct {
				Result Task      `json:"result"`
				Error  *rpcError `json:"error"`
			}
			if err := json.Unmarshal([]byte(payload), &out); err != nil {
				errs <- err

View on GitHub (pinned to 24529f1404)

Solutions

1. Fall back to tasks/get (polling) to fetch the task's current state instead of resubscribing.
2. Verify the task ID still exists on the remote agent; if it was completed or dropped, start a new SendMessage.
3. Refresh auth credentials before resubscribing if the error status is 401/403.
4. Retry resubscribe with backoff only for 5xx/429 statuses.

select {
case err := <-errs:
	if strings.Contains(err.Error(), "tasks/resubscribe: status") {
		// fall back to polling tasks/get for terminal state
	}
case ev := <-events:
	// handle event
}

When it happens

Trigger: Calling the resubscribe/stream method for a task ID the remote agent no longer knows (task pruned or unknown), or when the endpoint returns 401/404/5xx instead of an SSE response.

Common situations: Resuming after a network interruption but the agent already expired the task; wrong task ID after a reconnect; agent restarted with in-memory task state lost; auth token expired between the original subscribe and the resubscribe.

Related errors

• a2a tasks/resubscribe: %s (%d)
• stream API request failed: %w
• failed to parse stream chunk: %w
• anthropic stream error: %s
• stream API request failed: %w

AI-assisted analysis of micro/go-micro@24529f1404 (2026-09-01). Data as JSON: /api/errors/6dd03d5ddb787393. Report an issue: GitHub.