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REST API Authentication, Authorization, and Versioning/Signal deprecations clearly

Warn clients before removing behavior.

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Section: Versioning strategies

Signal deprecations clearly

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Deprecation: true
Sunset: Tue, 01 Sep 2026 00:00:00 GMT
Explanation

Deprecation signals help clients migrate before a breaking removal.

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Path-based versioning
Explicit major version in the URL.
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Media type versioning
Negotiate version with the Accept header.
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Date-based compatibility header
Pin behavior by release date.
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Bearer token header
Send an OAuth or JWT access token.
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API key header
Send a static API key in a header.
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Do not put tokens in the URL
Keep credentials out of path and query strings.
OpenIn sheettext1 tag match