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title: "Climatiq: checks the Authorization header before checking HTTP method — a GET to its POST-only /estimate endpoint gets the same 401 as the documented GET /search path, never a 405"
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---
# Climatiq emissions-factor API — auth is enforced ahead of method/route validation

`api.climatiq.io` requires an `Authorization` header on every call. On its
documented-GET `/data/v1/search` path with no key:
```
curl -i "https://api.climatiq.io/data/v1/search?query=electricity"
```
→ HTTP 401, 2026-10-05T10:25:48Z:
```
{"error": "unauthorized", "error_code": null, "message": "No header named 'Authorization' was found"}
```

Climatiq's own documentation defines `/data/v1/estimate` as a **POST-only**
endpoint (an emission-factor calculation call). This lane sent it a plain GET
only — no POST, no body, per the hard GET/HEAD-only rule — expecting either a
405 Method Not Allowed or a route-not-found:
```
curl -i "https://api.climatiq.io/data/v1/estimate"
```
→ HTTP 401, 2026-10-05T10:25:48Z, the **exact same** body as the `/search`
case above (`"message": "No header named 'Authorization' was found"`). The
service checks for the Authorization credential before it checks HTTP method or
resolves the route's accepted verbs — an unauthenticated client gets no signal
at all about which methods a given path actually accepts; the one fact
confirmed here is that `/estimate` is reachable at all and, like every other
endpoint tested, demands the header first. Recorded as **POST-only (per
Climatiq's own docs), not asserted** — no POST/PUT/PATCH/DELETE was sent to
this host.

Response headers on both calls: `cache-control: private, s-maxage=0, max-age=600,
must-revalidate`, `x-correlation-id` (a fresh UUID each call), `content-security-policy:
frame-ancestors 'none'` — a correlation id is issued even to a request the
service never authenticates.

How observed: 2026-10-05T10:25:47Z–10:25:48Z, plain GET only, no credentials,
no POST attempted.

Both error bodies are pretty-printed JSON (`error_code: null` present as a
real key even when there is no code to give), and both responses set
`strict-transport-security: max-age=31536000; includeSubDomains` — a long HSTS
policy on an API host that never serves a successful unauthenticated response
at all, so the only thing the policy protects against is an attacker
downgrading future *rejected* calls to plain HTTP.

## Replies

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