2018-07-01 19:22:53 +08:00
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# Items to be removed from future curl releases
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2018-07-02 14:14:53 +08:00
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If any of these deprecated features is a cause for concern for you, please
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2021-08-12 20:44:26 +08:00
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email the
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2021-08-30 15:51:07 +08:00
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[curl-library mailing list](https://lists.haxx.se/listinfo/curl-library)
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2021-08-12 20:44:26 +08:00
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as soon as possible and explain to us why this is a problem for you and
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2021-10-31 23:34:44 +08:00
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how your use case cannot be satisfied properly using a workaround.
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2018-09-05 06:05:46 +08:00
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2022-02-07 21:20:03 +08:00
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## NSS
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2022-08-17 16:06:11 +08:00
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We remove support for building curl with the NSS TLS library in August 2023.
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2022-02-07 21:20:03 +08:00
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- There are very few users left who use curl+NSS
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- NSS has very few users outside of curl as well (primarily Firefox)
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- NSS is harder than ever to find documentation for
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- NSS was always "best" used with Red Hat Linux when they provided additional
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2022-03-29 19:58:11 +08:00
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features on top of the regular NSS that is not shipped by the vanilla library
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2022-02-07 21:20:03 +08:00
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Starting in 7.82.0, building curl to use NSS configure requires the additional
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flag --with-nss-deprecated in an attempt to highlight these plans.
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2022-02-16 18:22:25 +08:00
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## NPN
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We make selecting NPN a no-op starting in August 2022.
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**Next Protocol Negotiation** is a TLS extension that was created and used for
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agreeing to use the SPDY protocol (the precursor to HTTP/2) for HTTPS. In the
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early days of HTTP/2, before the spec was finalized and shipped, the protocol
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could be enabled using this extension with some servers.
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curl supports the NPN extension with some TLS backends since then, with a
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command line option `--npn` and in libcurl with `CURLOPT_SSL_ENABLE_NPN`.
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HTTP/2 proper is made to use the ALPN (Application-Layer Protocol Negotiation)
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extension and the NPN extension has no purposes anymore. The HTTP/2 spec was
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published in May 2015.
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Today, use of NPN in the wild should be extremely rare and most likely totally
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extinct. Chrome removed NPN support in Chrome 51, shipped in
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June 2016. Removed in Firefox 53, April 2017.
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2022-02-07 21:20:03 +08:00
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## past removals
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2019-05-15 19:57:16 +08:00
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2020-01-16 15:17:04 +08:00
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- Pipelining
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- axTLS
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- PolarSSL
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