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The Deprecation HTTP Header Field
(greenbytes.de)
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this post was submitted on 09 Jul 2024
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Programming
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I don't really get the purpose of a header like this, who is supposed to check it? It's not like developers casually check the headers returned by an API every week.
Write them a mail if you see deprecated functions being used by a certain API key, probably much more likely to reach somebody that way.
Also, TIL that the IETF deprecated the
X-prefix more than 10 years ago. Seems like that one didn't pan out.You can simply log this response. Then developers know to replace that call in the next version. If you have unit tests that look for this then you can be sure that your next version is not using any deprecated API calls.
We don't have many unit tests that test against live APIs, most use mock APIs for testing.
The only use for this header would be if somebody sees it during development, at which point it would already be in the documentation or if you explicitly add a feature to look if the header is present. Which I don't see happening any time soon since we get mailed about deprecations as well.