These libraries do not support TLS 1.3 and have been marked for removal
for over a year. We want to help users select a TLS dependency that is
future-proof and reliable, and not supporting TLS 1.3 in 2025 does not
infer confidence. Users who build libcurl are likely to be served better
and get something more future-proof with a TLS library that supports
1.3.
Closes#16677
We recommend migrating to CMake from winbuild and Visual Studio project
files. winbuild is deprecated and will be dropped in September 2025.
CMake supports all the features and options, with new ones added
promptly. It supports out-of-tree, unity and documentation builds.
- deprecate winbuild method in favour of CMake by September 2025.
- add migration guide from winbuild to CMake.
- add migration guide from Visual Studio Project Files to CMake.
- add deprecation message to winbuild.
Need to ack with `WINBUILD_ACKNOWLEDGE_DEPRECATED=yes`
Authored-by: Jay Satiro
- mention `CMAKE_BUILD_TYPE` option in `INSTALL-CMAKE`.
- document missing `SSH_PATH` winbuild option.
Closes#15920
The msh3 backed for QUIC and HTTP/3 was introduced in April 2022 but has
never been made to work properly. It has seen no visible traction or
developer activity from the msh3 main author (or anyone else seemingly
interested) in two years. As a non-functional backend, it only adds
friction and "weight" to the development and maintenance.
Meanwhile, we have a fully working backend in the ngtcp2 one and we have
two fully working backends in OpenSSL-QUIC and quiche well on their way
of ending their experimental status in a future.
We remove msh3 support from the curl source tree in July 2025.
Closes#15931
lib : remove all hyper code
configure: stop detecting hyper
docs: no more mention of hyper
tests: mo more special-handling of hyper builds
CI: no jobs using hyper
Closes#15120
Previously this document stated we would do it after February, but now
it will be done already for the first January 2025 release.
The reason being that since we decided to deprecate hyper, the
degradation speed has increased as now no one bothers to fix issues in
the hyper side of things. Also: not a single soul has yet spoken up in
favor of keeping the support.
Closes#15135
Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,
macOS, MS-DOS, MSYS, MinGW, NTLM, POSIX, Solaris, UNIX, Unix, Unicode,
WINE, WebDAV, Win32, winbind, WinIDN, Windows, Windows CE, Winsock.
Mostly OS names and a few more.
Also a couple of other minor text fixups.
Closes#14360
curl drops support for TLS libraries without TLS 1.3 capability after
May 2025.
It requires that a curl build using the library should be able to
negotiate and use TLS 1.3, or else it is not good enough. We support a
vast amount of other TLS libraries that are likely to satisfy users
better.
Closes#13544
Instead of use 'docs/*.md' in dep5. For clarity and avoiding a wide-
matching wildcard.
+ Remove mention of old files from .reuse/dep5
+ add info to .github/dependabot.yml
+ make scripts/copyright.pl warn on non-matching patterns
Closes#13245
This means words, phrases or things we have decided not to use - words that
are spelled right according to the dictionary but we want to avoid. In the
name of consistency and better documentation.
Closes#12764
- delete completed TODO from `./CMakeLists.txt`.
- convert a C++ comment to C89 in `./CMake/CurlTests.c`.
- delete duplicate EOLs from EOF.
- add missing EOL at EOF.
- delete whitespace at EOL (except from expected test results).
- convert tabs to spaces.
- convert CRLF EOLs to LF in GHA yaml.
- text casing fixes in `./CMakeLists.txt`.
- fix a codespell typo in `packages/OS400/initscript.sh`.
Closes#11772
We remove support for building curl with gskit.
- This is a niche TLS library, only running on some IBM systems
- no regular curl contributors use this backend
- no CI builds use or verify this backend
- gskit, or the curl adaption for it, lacks many modern TLS features
making it an inferior solution
- build breakages in this code take weeks or more to get detected
- fixing gskit code is mostly done "flying blind"
This removal has been advertized in DEPRECATED in Jan 2, 2023 and it has
been mentioned on the curl-library mailing list.
It could be brought back, this is not a ban. Given proper effort and
will, gskit support is welcome back into the curl TLS backend family.
Closes#11460
Ref: #10163
- This is a niche TLS library, only running on some IBM systems
- no regular curl contributors use this backend
- no CI builds use or verify this backend
- gskit, or the curl adaption for it, lacks many modern TLS features
making it an inferior solution
- build breakages in this code take weeks or more to get detected
- fixing gskit code is mostly done "flying blind"
Closes#10201
If curl_off_t turns out to be smaller than 8 bytes,
--with-n64-deprecated needs to be used to allow the build to
continue. This is to highlight the fact that support for such builds is
going away next year.
Also mentioned in DEPRECATED.md
Closes#9605
Next Protocol Negotiation is a TLS extension that was created and used
for agreeing to use the SPDY protocol (the precursor to HTTP/2) for
HTTPS. In the early days of HTTP/2, before the spec was finalized and
shipped, the protocol could be enabled using this extension with some
servers.
curl supports the NPN extension with some TLS backends since then, with
a command line option `--npn` and in libcurl with
`CURLOPT_SSL_ENABLE_NPN`.
HTTP/2 proper is made to use the ALPN (Application-Layer Protocol
Negotiation) extension and the NPN extension has no purposes
anymore. The HTTP/2 spec was published in May 2015.
Today, use of NPN in the wild should be extremely rare and most likely
totally extinct. Chrome removed NPN support in Chrome 51, shipped in
June 2016. Removed in Firefox 53, April 2017.
Closes#9307
Mostly based on recent language decisions from "everything curl":
- remove contractions (isn't => is not)
- *an* HTTP (consistency)
- runtime (no hyphen)
- backend (no hyphen)
- URL is uppercase
Closes#8646
