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A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
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Daniel Stenberg b174b8b326
ECH: cleanups 
- passing an unknown string to CURLOPT_ECH now returns error

  To properly allow applications to spot if they pass in a typo or
  something to libcurl.

- CURLECH_DISABLE is now a plain zero internally, not a dedicated bit which
  simplifies checks for when ECH is enabled

- Dropped the CURLECH_CLA_CFG bit, and just check STRING_ECH_CONFIG

- Turn grease/enable/hard into three different numerical values, no bitmask
  needed

- Convert the struct field 'tls_ech' from an int to a byte.

Closes #21532
2026-05-08 13:09:45 +02:00
.circleci runtests: detect bad libssh differently for test 1459 (fixing CircleCI libssh job) 2025-11-16 23:28:44 +01:00
.github GHA: verify function-lengths 2026-05-05 16:26:44 +02:00
CMake tidy-up: miscellaneous 2026-04-14 01:08:32 +02:00
docs CURLOPT_HAPROXYPROTOCOL.md: only sent for newly setup connections 2026-05-07 09:11:30 +02:00
include RELEASE-NOTES: synced 2026-05-06 09:19:12 +02:00
lib ECH: cleanups 2026-05-08 13:09:45 +02:00
LICENSES spacecheck: check long lines and repeat spaces, fix fallouts 2026-03-25 11:02:08 +01:00
m4 tidy-up: miscellaneous 2026-04-14 01:08:32 +02:00
projects build: link bcrypt.lib via vcxproj files 2026-04-20 16:29:25 +02:00
scripts GHA: verify function-lengths 2026-05-05 16:26:44 +02:00
src tool_urlglob: avoid overflow at end of range 2026-05-07 22:58:20 +02:00
tests ECH: cleanups 2026-05-08 13:09:45 +02:00
.clang-tidy.yml clang-tidy: enable more checks, fix fallouts 2026-04-14 02:20:16 +02:00
.dir-locals.el copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
.editorconfig .editorconfig: add 2025-09-02 08:36:40 +02:00
.git-blame-ignore-revs copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
.gitattributes buildconf: remove 2026-04-04 11:35:24 +02:00
.gitignore build: drop the winbuild build system 2025-09-20 01:20:25 +02:00
.mailmap tool: fix two more allocator mismatches 2026-03-30 16:17:42 +02:00
acinclude.m4 configure: tidy up comments 2026-04-10 23:19:41 +02:00
appveyor.sh appveyor: bump to OpenSSL 3.6 2026-04-22 09:29:05 +02:00
appveyor.yml CI: set DO_NOT_TRACK=1 2026-04-23 11:22:35 +02:00
CHANGES.md CHANGES: fix typo in filename 2026-01-01 12:20:10 +01:00
CMakeLists.txt cmake: do not install wcurl when BUILD_CURL_EXE=OFF 2026-04-27 17:46:42 +02:00
configure.ac configure: tidy up comments 2026-04-10 23:19:41 +02:00
COPYING COPYING: bump copyright year range to 1996 - 2026 2026-01-08 23:19:44 +01:00
curl-config.in autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
Dockerfile Dockerfile: update debian:bookworm-slim Docker digest to f9c6a2f 2026-04-22 09:29:05 +02:00
GIT-INFO.md REUSE: add copyright header to two files 2025-11-03 16:08:52 +01:00
libcurl.pc.in configure: do not echo most inherited LDFLAGS to config files 2024-11-14 09:55:45 +01:00
Makefile.am rtmp: drop support 2026-03-21 14:56:06 +01:00
README BUG-BOUNTY.md: we stop the bug-bounty end of Jan 2026 2026-01-26 08:26:28 +01:00
README.md rtmp: drop support 2026-03-21 14:56:06 +01:00
RELEASE-NOTES RELEASE-NOTES: synced 2026-05-06 09:19:12 +02:00
renovate.json renovate: use standard bump formula for OpenSSL 2026-04-15 10:17:33 +02:00
REUSE.toml badwords: avoid 'simply' 2026-03-10 19:34:06 +01:00
SECURITY.md stop using the word 'just' 2026-03-03 15:30:22 +01:00

README.md

curl logo

curl is a command-line tool for transferring data from or to a server using URLs. It supports these protocols: DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS.

Learn how to use curl by reading the man page or everything curl.

Find out how to install curl by reading the INSTALL document.

libcurl is the library curl is using to do its job. It is readily available to be used by your software. Read the libcurl man page to learn how.

Open Source

curl is Open Source and is distributed under an MIT-like license.

Contact

Contact us on a suitable mailing list or use GitHub issues/ pull requests/ discussions.

All contributors to the project are listed in the THANKS document.

Commercial support

For commercial support, maybe private and dedicated help with your problems or applications using (lib)curl visit the support page.

Website

Visit the curl website for the latest news and downloads.

Source code

Download the latest source from the Git server:

git clone https://github.com/curl/curl

Security problems

Report suspected security problems privately and not in public.

Backers

Thank you to all our backers 🙏 Become a backer.

Sponsors

Support this project by becoming a sponsor.