dotnet/orleans · warning · Error

failed with

Error message

${url} failed with ${response.status}

What it means

A browser-side Error thrown by the generic post() helper in the DurableJobsJournaling web frontend when any POST (e.g., /api/load/start) returns a non-2xx status. The helper builds fetch options, checks response.ok, and throws a templated message including the URL and status code so the failure is identifiable. The throw propagates to the caller, which is expected to handle it.

Solutions

1. Read the status code embedded in the error message to classify the failure (4xx = client/validation, 5xx = server).
2. Inspect the server logs / response body for the POST URL named in the message.
3. Wrap post() calls in try/catch at the call site to give the user feedback instead of an unhandled rejection.

Example fix

// before
const response = await fetch(url, options);
if (!response.ok) {
  throw new Error(`${url} failed with ${response.status}`);
}

// after (include body for diagnosis)
const response = await fetch(url, options);
if (!response.ok) {
  const detail = await response.text().catch(() => "<no body>");
  throw new Error(`${url} failed with ${response.status}: ${detail}`);
}

async function safePost(url, body) {
  try {
    const response = await post(url, body);
  } catch (err) {
    console.error(err);
    showErrorToUser(`Could not perform ${url}: ${err.message}`);
  }
}

When it happens

Trigger: Any UI action that calls post(url, body) — starting/stopping load, triggering jobs — and the server returns an error status. The post() helper does not catch, so an unhandled rejection surfaces in the console unless the caller wraps it.

Common situations: The load-generation grain threw an exception, the journaling backend is unhealthy, or a request body failed server-side validation. The status code in the message indicates which.

Related errors

• HTTP error! status
• Network response was not ok
• /api/load failed with
• Failed to read Azure Storage table
• One or more errors occurred.

AI-assisted analysis of dotnet/orleans@fca799fa70 (2026-08-13). Data as JSON: /api/errors/0aaf188ea7ff0a43. Report an issue: GitHub.

Appendix: source

Thrown at playground/DurableJobsJournaling/DurableJobsJournaling.Web/wwwroot/index.html:104

  <section class="card" style="margin-top:16px">
    <h2>Recent workflows</h2>
    <table><thead><tr><th>Workflow</th><th>Status</th><th>Latency ms</th><th>Retries</th><th>Failures</th><th>Error</th></tr></thead><tbody id="recent"></tbody></table>
  </section>

  <script>
    let controlsInitialized = false;

    async function post(url, body) {
      const options = { method: 'POST' };
      if (body !== undefined) {
        options.headers = { 'content-type': 'application/json' };
        options.body = JSON.stringify(body);
      }

      const response = await fetch(url, options);
      if (!response.ok) {
        throw new Error(`${url} failed with ${response.status}`);
      }

      await refresh();
    }

    async function saveSettings() {
      const response = await fetch('/api/load', {
        method: 'PUT',
        headers: { 'content-type': 'application/json' },
        body: JSON.stringify(settings())
      });
      if (!response.ok) {
        throw new Error(`/api/load failed with ${response.status}`);
      }

      applySettings(await response.json());
      await refresh();
    }

View on GitHub (pinned to fca799fa70)