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curl -X POST https://api.firecrawl.dev/v2/support/docs-search \  -H "Authorization: Bearer fc-YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "question": "what header carries the webhook signature, and how do I verify it?"  }'

{  "requestId": "req_...",  "answer": "The signature is sent in the X-Firecrawl-Signature header...",  "evidence": [    {      "pathOrUrl": "webhooks/security.mdx#L1-L52",      "reason": "Documents webhook signature verification"    }  ],  "usage": { "inputTokens": 4356, "outputTokens": 688, "totalTokens": 5044 },  "durationMs": 11252}