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7858a76 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | > ## Documentation Index
> Fetch the complete documentation index at: https://docs.wafer.ai/llms.txt
> Use this file to discover all available pages before exploring further.
# Zero Data Retention
> Require ZDR on individual Wafer Serverless requests.
Serverless keys do not require Zero Data Retention (ZDR) by default. To require ZDR for a Serverless request, send `Wafer-ZDR: required`.
```bash theme={null}
curl -sS "https://pass.wafer.ai/v1/chat/completions" \
-H "Authorization: Bearer <YOUR_WAFER_API_KEY>" \
-H "Wafer-ZDR: required" \
-H "Content-Type: application/json" \
-d '{
"model": "GLM-5.1",
"messages": [{"role": "user", "content": "Hello!"}]
}'
```
If the selected model supports ZDR, Wafer routes the request normally. If the selected model does not support ZDR, Wafer rejects the request before routing it upstream and returns `model_zdr_not_supported`.
Some GUI harnesses do not expose custom request headers. For those apps, use a harness-specific custom header path when available (for example, Claude Code's `ANTHROPIC_CUSTOM_HEADERS`) so ZDR can still be enforced per request.
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