API Deprecation Header Checker

🔍 Check an API endpoint

API endpoint URL (HTTPS only)

Try: api.github.com/meta httpbin.org/headers simulate Sunset header

Authorization header (optional)

For authenticated endpoints like Stripe, GitHub private repos, etc. Never stored.

📋 Response details

Status

—

Latency

—

URL

—

Deprecation-related headers

Header

Value

Meaning

All response headers

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📖 What these headers mean

Sunset

A date/time after which the resource will no longer be available. Defined in RFC 8594. If you see this, you have until that date to migrate. The closer the date, the more urgent the action.
Deprecation

Signals that the endpoint is deprecated (may be a boolean "true" or a date). Often accompanies a Link header pointing to the replacement.
X-Api-Version / Api-Version

The version of the API that responded. If this changes without your code changing, you may have been automatically upgraded to a newer version.
Link

When paired with rel="deprecation" or rel="successor-version", points to the replacement endpoint or deprecation documentation.
Warning

A general-purpose warning header. Some APIs use this to signal deprecation with a human-readable message (e.g. Warning: 299 - "This endpoint is deprecated")

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