jackwener/OpenCLI · error · CommandExecutionError

Failed to open Zhihu answer ${target.answerId}: ${error inst

Error message

Failed to open Zhihu answer ${target.answerId}: ${error instanceof Error ? error.message : String(error)}

What it means

extractAnswer first navigates the Browser Bridge page to https://www.zhihu.com/answer/<answerId>. If page.goto rejects — unreachable host, DNS failure, timeout, connection reset, or the bridge cannot control the tab — the error is converted to a CommandExecutionError that names the answer id and includes a remediation hint: open the URL in Chrome and retry once reachable. It fires before any scraping or API call happens.

Source

Thrown at clis/zhihu/download-helpers.js:150

        return {
          title: document.querySelector('.Post-Title, h1.ContentItem-title, .ArticleTitle')?.textContent?.trim() || 'untitled',
          author: document.querySelector('.AuthorInfo-name, .UserLink-link')?.textContent?.trim() || '',
          publishTime: document.querySelector('.ContentItem-time, .Post-Time')?.textContent?.trim() || '',
          ...normalized
        };
      })()
    `).catch((error) => {
        throw new CommandExecutionError(`Zhihu column extraction failed: ${error instanceof Error ? error.message : String(error)}`);
    });
    return requireArticle(raw);
}

export async function extractAnswer(page, target) {
    try {
        await page.goto(`https://www.zhihu.com/answer/${target.answerId}`);
    }
    catch (error) {
        throw new CommandExecutionError(
            `Failed to open Zhihu answer ${target.answerId}: ${error instanceof Error ? error.message : String(error)}`,
            'Open the answer URL in Chrome and retry after the page is reachable.',
        );
    }
    const currentUrl = typeof page.getCurrentUrl === 'function' ? await page.getCurrentUrl().catch(() => '') : '';
    const currentTarget = parseAnswerTarget(currentUrl);
    if (!currentTarget || currentTarget.answerId !== target.answerId || !currentTarget.questionId
        || (target.questionId && currentTarget.questionId && target.questionId !== currentTarget.questionId)) {
        throw new CommandExecutionError(`Zhihu answer navigation changed identity for answer ${target.answerId}`);
    }

    const apiUrl = `https://www.zhihu.com/api/v4/answers/${target.answerId}?include=content,author,created_time,question,url`;
    const normalize = `(${normalizeContentImages.toString()})`;
    const raw = await page.evaluate(`
      (async () => {
        let response;
        try {
          response = await fetch(${JSON.stringify(apiUrl)}, { credentials: 'include' });

View on GitHub (pinned to 49907e53dc)

Solutions

1. Check network connectivity and confirm https://www.zhihu.com resolves in a browser.
2. Relaunch/reconnect the Chrome instance backing the Browser Bridge, then rerun the command.
3. Retry after a short wait — transient timeouts and connection resets are the most common cause.
4. If behind a proxy/firewall, allow-list www.zhihu.com or switch networks.

Example fix

// before
await extractAnswer(page, { answerId: '12345' });
// after
try {
  await extractAnswer(page, { answerId: '12345' });
} catch (err) {
  if (/Failed to open Zhihu answer/.test(err.message)) {
    await sleep(3000); // transient network/timeout — retry once
    await extractAnswer(page, { answerId: '12345' });
  } else throw err;
}

async function canReachZhihu() {
  try {
    const res = await fetch('https://www.zhihu.com/robots.txt', { method: 'HEAD' });
    return res.ok || res.status < 500;
  } catch { return false; }
}
if (!(await canReachZhihu())) throw new Error('zhihu.com unreachable; fix network before extracting');

try {
  await extractAnswer(page, { answerId });
} catch (err) {
  if (String(err.message).startsWith('Failed to open Zhihu answer')) {
    // network/navigation failure: backoff and retry up to N times
    for (let i = 1; i <= 3; i++) {
      await sleep(i * 2000);
      try { return await extractAnswer(page, { answerId }); } catch { /* retry */ }
    }
  }
  throw err;
}

When it happens

Trigger: Calling extractAnswer(page, { answerId }) when page.goto to www.zhihu.com/answer/<id> throws: no internet/DNS failure, Zhihu unreachable or timing out, the Browser Bridge Chrome instance is closed, or the tab was killed during navigation.

Common situations: Developer offline or behind a proxy/firewall blocking www.zhihu.com; Chrome profile used by the bridge was closed; corporate network blocks zhihu.com; transient Zhihu outage; typo in the answer id causing an immediate connection-level failure (rare, usually gives 404 instead).

Related errors

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• FETCH_ERROR
• archive wayback request failed: ${error?.message || error}

AI-assisted analysis of jackwener/OpenCLI@49907e53dc (2026-08-29). Data as JSON: /api/errors/23eee717379ccb7c. Report an issue: GitHub.