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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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Stefan Eissing 4ff212f8ed
url: connection reuse fixes for starttls 
Add test_31_13 to check connection reuse on mixed --ssl-reqd setting.
For that add debug env var CURL_DBG_NO_USE_SSL_ON_FIRST to disable
--ssl-reqd for the first url. Check that the connection without SSL
from the first url is not reused on the second URL that requires it.

Tweak special ftp: protocol check to fail a DEBUGASSERT on mismatched
`use_ssl` settings as that should have been caught before in the
connection reuse matching (imap/smtp etc. do not have this extra check
and rely on the general part doing its job).

Closes #21665
2026-05-31 23:29:15 +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: update dependency ngtcp2/ngtcp2 to v1.23.0 2026-05-31 18:40:25 +02:00
CMake cmake: opt in MSVC_VERSION 1951 to picky warnings 2026-05-21 15:16:21 +02:00
docs url: connection reuse fixes for starttls 2026-05-31 23:29:15 +02:00
include badwords: prefer 'workaround' (without hyphen) 2026-05-31 22:05:54 +02:00
lib url: connection reuse fixes for starttls 2026-05-31 23:29:15 +02:00
LICENSES spacecheck: check long lines and repeat spaces, fix fallouts 2026-03-25 11:02:08 +01:00
m4 build: say 'experimental' in option descriptions 2026-05-28 12:52:50 +02:00
projects tidy-up: miscellaneous 2026-05-27 16:53:57 +02:00
scripts badwords: prefer 'workaround' (without hyphen) 2026-05-31 22:05:54 +02:00
src url: connection reuse fixes for starttls 2026-05-31 23:29:15 +02:00
tests url: connection reuse fixes for starttls 2026-05-31 23:29:15 +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 mailmap: cmeister2@gmail is primary for Max Dymond 2026-05-24 12:02:26 +02:00
acinclude.m4 build: omit zlib pkg-config reference for Android 2026-05-17 13:27:06 +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 h3-proxy: rename feature 'Proxy/PROXY-HTTP3' to 'proxy-HTTP3' 2026-05-28 12:52:50 +02:00
configure.ac h3-proxy: rename feature 'Proxy/PROXY-HTTP3' to 'proxy-HTTP3' 2026-05-28 12:52:50 +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: fix typo in variable name 2026-05-20 13:01:56 +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 tidy-up: miscellaneous 2026-05-27 16:53:57 +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.