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curl/docs/DEPRECATE.md
Viktor Szakats 814b54d83e
tidy-up: miscellaneous 
- whitespace, indent, comments, clang-format.
- openssl: move feature guards within function blocks.
- tunit: drop redundant blocks.

Closes #20361
2026-01-20 12:37:56 +01:00

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Items to be removed from future curl releases

If any of these deprecated features is a cause for concern for you, please email the curl-library mailing list as soon as possible and explain to us why this is a problem for you and how your use case cannot be satisfied properly using a workaround.

c-ares 1.16.0

In March 2026, we drop support for all c-ares versions before 1.16.0.

RTMP

RTMP in curl is powered by the 3rd party library librtmp.

  • RTMP is barely used by curl users (2.2% in the 2025 survey)
  • librtmp has no test cases, makes no proper releases and has not had a single commit within the last year
  • librtmp parses the URL itself and requires non-compliant URLs for this
  • we have no RTMP tests

Support for RTMP in libcurl gets removed in April 2026.

CMake 3.17 and earlier

We remove support for CMake <3.18 in April 2026.

CMake 3.18 was released on 2020-07-15.

Past removals

  • axTLS (removed in 7.63.0)
  • Pipelining (removed in 7.65.0)
  • PolarSSL (removed in 7.69.0)
  • NPN (removed in 7.86.0)
  • Support for systems without 64-bit data types (removed in 8.0.0)
  • NSS (removed in 8.3.0)
  • gskit (removed in 8.3.0)
  • MinGW v1 (removed in 8.4.0)
  • NTLM_WB (removed in 8.8.0)
  • space-separated NOPROXY patterns (removed in 8.9.0)
  • hyper (removed in 8.12.0)
  • Support for Visual Studio 2005 and older (removed in 8.13.0)
  • Secure Transport (removed in 8.15.0)
  • BearSSL (removed in 8.15.0)
  • msh3 (removed in 8.16.0)
  • winbuild build system (removed in 8.17.0)
  • Windows CE (removed in 8.18.0)
  • Support for Visual Studio 2008 (removed in 8.18.0)
  • OpenSSL 1.1.1 and older (removed in 8.18.0)
  • Support for Windows XP (removed in 8.19.0)
  • OpenSSL-QUIC (removed in 8.19.0)