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.agents/skills/cloudflare-deploy/references/ai-gateway/troubleshooting.md

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+# AI Gateway Troubleshooting
+
+## Common Errors
+
+| Error | Cause | Fix |
+|-------|-------|-----|
+| 401 | Missing `cf-aig-authorization` header | Add header with CF API token |
+| 403 | Invalid provider key / BYOK expired | Check provider key in dashboard |
+| 429 | Rate limit exceeded | Increase limit or implement backoff |
+
+### 401 Fix
+
+```typescript
+const client = new OpenAI({
+  baseURL: `https://gateway.ai.cloudflare.com/v1/${accountId}/${gatewayId}/openai`,
+  defaultHeaders: { 'cf-aig-authorization': `Bearer ${CF_API_TOKEN}` }
+});
+```
+
+### 429 Retry Pattern
+
+```typescript
+async function requestWithRetry(fn, maxRetries = 3) {
+  for (let i = 0; i < maxRetries; i++) {
+    try { return await fn(); }
+    catch (e) {
+      if (e.status === 429 && i < maxRetries - 1) {
+        await new Promise(r => setTimeout(r, Math.pow(2, i) * 1000));
+        continue;
+      }
+      throw e;
+    }
+  }
+}
+```
+
+## Gotchas
+
+| Issue | Reality |
+|-------|---------|
+| Metadata limits | Max 5 entries, flat only (no nesting) |
+| Cache key collision | Use unique keys per expected response |
+| BYOK + Unified Billing | Mutually exclusive |
+| Rate limit scope | Per-gateway, not per-user (use dynamic routing for per-user) |
+| Log delay | 30-60 seconds normal |
+| Streaming + caching | **Incompatible** |
+| Model name (unified API) | Prefix required: `openai/gpt-4o`, not `gpt-4o` |
+
+## Cache Not Working
+
+**Causes:**
+- Different request params (temperature, etc.)
+- Streaming enabled
+- Caching disabled in settings
+
+**Check:** `response.headers.get('cf-aig-cache-status')` → HIT or MISS
+
+## Logs Not Appearing
+
+1. Check logging enabled: Dashboard → Gateway → Settings
+2. Remove `cf-aig-collect-log: false` header
+3. Wait 30-60 seconds
+4. Check log limit (10M default)
+
+## Debugging
+
+```bash
+# Test connectivity
+curl -v https://gateway.ai.cloudflare.com/v1/{account}/{gateway}/openai/models \
+  -H "Authorization: Bearer $OPENAI_KEY" \
+  -H "cf-aig-authorization: Bearer $CF_TOKEN"
+```
+
+```typescript
+// Check response headers
+console.log('Cache:', response.headers.get('cf-aig-cache-status'));
+console.log('Request ID:', response.headers.get('cf-ray'));
+```
+
+## Analytics
+
+Dashboard → AI Gateway → Select gateway
+
+**Metrics:** Requests, tokens, latency (p50/p95/p99), cache hit rate, costs
+
+**Log filters:** `status: error`, `provider: openai`, `cost > 0.01`, `duration > 1000`
+
+**Export:** Logpush to S3/GCS/Datadog/Splunk