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HTTP status: 401

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Message

Missing Authorization header. Add Authorization: Bearer 1st_sk_<key_id>.<secret> to your request.

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Common cause

The request reached the API without an Authorization header. Typical causes:
  • Forgot to add the header in your HTTP client.
  • The env var holding your key is empty at request time (set in one shell, running in another).
  • A proxy or CDN stripped the header on the way in.

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Fix

Add the header: 
curl -H "Authorization: Bearer $ST_API_KEY" \
  "https://api.1st.app/v1/sensors"
If you’re using a higher-level client, verify Authorization is set on the final outbound request — log the request headers to confirm.