Error Handling

{
  "error": {
    "code": 401,
    "message": "Invalid or missing API key. Include your key in the Ocp-Apim-Subscription-Key header."
  }
}

async function fetchWithRetry(url, options, maxRetries = 3) {
  for (let attempt = 0; attempt <= maxRetries; attempt++) {
    try {
      const response = await fetch(url, options);

      if (response.ok) return response.json();

      // Client errors: do not retry
      if (response.status >= 400 && response.status < 500 && response.status !== 429) {
        const error = await response.json();
        throw new Error(`Client error ${response.status}: ${error.error.message}`);
      }

      // Rate limited: wait and retry
      if (response.status === 429) {
        const retryAfter = parseInt(response.headers.get("Retry-After") || "60");
        console.log(`Rate limited. Waiting ${retryAfter}s...`);
        await new Promise(r => setTimeout(r, retryAfter * 1000));
        continue;
      }

      // Server error: retry with backoff
      if (attempt < maxRetries) {
        const delay = Math.pow(2, attempt) * 1000;
        console.log(`Server error ${response.status}. Retrying in ${delay}ms...`);
        await new Promise(r => setTimeout(r, delay));
        continue;
      }

      throw new Error(`Server error ${response.status} after ${maxRetries} retries`);
    } catch (err) {
      if (err.message.startsWith("Client error")) throw err;
      if (attempt === maxRetries) throw err;
      const delay = Math.pow(2, attempt) * 1000;
      await new Promise(r => setTimeout(r, delay));
    }
  }
}