windmill-labs/windmill · error

SSE request failed: ${response.status} ${response.statusText

Error message

SSE request failed: ${response.status} ${response.statusText}

What it means

HTTP-level guard in the dev server's SSE job-watch helper: the fetch to /api/w/{workspace}/jobs_u/getupdate_sse/{jobId} returned a non-2xx status (the message embeds status and status text). Because detectAuthGatewayChallenge already ran, an auth-portal redirect was excluded — so this is a genuine API error: expired/invalid token (401), missing permissions (403), unknown job id (404) or a server error. The faulting input is the authenticated request to the SSE endpoint.

Source

Thrown at cli/src/commands/app/dev.ts:1977

  baseUrl: string,
  token: string,
): Promise<void> {
  const sseUrl =
    `${baseUrl}api/w/${workspace}/jobs_u/getupdate_sse/${jobId}?fast=true`;

  const extraHeaders = getHeaders();
  const response = await fetch(sseUrl, {
    headers: {
      Accept: "text/event-stream",
      Authorization: `Bearer ${token}`,
      ...extraHeaders,
    },
  });

  await detectAuthGatewayChallenge(response, sseUrl);

  if (!response.ok) {
    throw new Error(
      `SSE request failed: ${response.status} ${response.statusText}`,
    );
  }

  const reader = response.body?.getReader();
  if (!reader) {
    throw new Error("No response body for SSE stream");
  }

  const decoder = new TextDecoder();
  let buffer = "";

  try {
    while (true) {
      const { done, value } = await reader.read();
      if (done) break;

      buffer += decoder.decode(value, { stream: true });

View on GitHub (pinned to e474e8803c)

Solutions

1. Match the status: 401 → re-login (wmill login / refresh token in the dev session); 403 → check workspace/job permissions; 404 → the job id is wrong or already expired from retention
2. Restart the app dev session to pick up fresh credentials
3. If 5xx, check backend health/logs — the SSE endpoint itself failed

When it happens

Trigger: Thrown at cli/src/commands/app/dev.ts:1977 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of windmill-labs/windmill@e474e8803c (2026-09-03). Data as JSON: /api/errors/23aec33487f5694f. Report an issue: GitHub.