Updated: curl, libcurl{4, -devel, -doc}, mingw64-{x86_64, i686}-curl 7.81

Cygwin curl Maintainer Brian.Inglis@SystematicSW.ab.ca
Sat Jan 8 23:14:35 GMT 2022

The following packages have been upgraded in the Cygwin distribution:

* curl			7.81
* libcurl4		7.81
* libcurl-devel		7.81
* libcurl-doc		7.81
* mingw64-x86_64-curl	7.81
* mingw64-i686-curl	7.81

Command line tool and Library supporting transferring files with
FILE, SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form
based upload, proxies, cookies, user+password authentication (Basic,
Digest, NTLM, Negotiate...), file transfer resume, proxy tunneling and a
busload of other useful tricks.

For more information see the project home page:


As there are multiple components and many changes each release please
see below or read /usr/share/doc/curl/RELEASE-NOTES after installation;
for complete details of changes since the previous Cygwin release see:


curl and libcurl 7.81.0

 Public curl releases:         205
 Command line options:         244
 curl_easy_setopt() options:   295
 Public functions in libcurl:  86
 Contributors:                 2558

This release includes the following changes:

 o mime: use percent-escaping for multipart form field and file names [1]

This release includes the following known bugs:

 o see docs/KNOWN_BUGS (https://curl.se/docs/knownbugs.html)

This release includes the following bugfixes:

 o asyn-ares: ares_getaddrinfo needs no happy eyeballs timer [73]
 o azure: make the "w/o HTTP/SMTP/IMAP" build disable SSL proper [12]
 o BINDINGS: add cURL client for PostgreSQL [68]
 o BINDINGS: add one from Everything curl and update a link
 o checksrc: detect more kinds of NULL comparisons we avoid [105]
 o CI: build examples for additional code verification [75]
 o CI: bump job to use mbedtls 3.1.0 [90]
 o cmake: don't set _USRDLL on a static Windows build [22]
 o cmake: prevent dev warning due to mismatched arg [94]
 o cmake: private identifiers use CURL_ instead of CMAKE_ prefix [40]
 o config.d: update documentation to match the path search
 o configure: add -lm to configure for rustls build. [13]
 o configure: better diagnostics if hyper is built wrong [6]
 o configure: don't enable TLS when --without-* flags are used [17]
 o configure: fix runtime-lib detection on macOS [21]
 o curl.1: require "see also" for every documented option [27]
 o curl: improve error message for --head with -J [42]
 o curl_easy_cleanup.3: remove from multi handle first [3]
 o curl_easy_escape.3: call curl_easy_cleanup in example [58]
 o curl_easy_unescape.3: call curl_easy_cleanup in example [57]
 o curl_multi_init.3: fix EXAMPLE formatting
 o curl_multi_perform/socket_action.3: clarify what errors mean [70]
 o curl_share_setopt.3: split out options into their own manpages [14]
 o CURLOPT_STDERR.3: does not work with libcurl as a win32 DLL [51]
 o digest: compute user:realm:pass digest w/o userhash [45]
 o docs/checksrc: Add documentation for STRERROR [18]
 o docs/cmdline-opts: do not say "protocols: all" [26]
 o docs/examples: workaround broken -Wno-pedantic-ms-format
 o docs/HTTP3: describe how to setup a h3 reverse-proxy for testing [88]
 o docs/INSTALL.md: typo fix : added missing "get" verb [31]
 o docs/URL-SYNTAX.md: space is not fine in a given URL
 o docs: add known bugs list to HTTP3.md [83]
 o docs: address proselint nits [16]
 o docs: consistent manpage SYNOPSIS [47]
 o docs: fix dead links, remove ECH.md
 o docs: fix typo in OpenSSL 3 build instructions [80]
 o docs: Update the Reducing Size section
 o example/progressfunc: remove code for old libcurls [78]
 o examples/multi-single.c: remove WAITMS() [98]
 o FAQ: typo fix : "yout" ➤ "your" [30]
 o ftp: disable warning 4706 in MSVC [85]
 o gen.pl: improve example output format [29]
 o github workflow: add wolfssl (removed from zuul) [103]
 o github/workflows: add mbedtls and mbedtls-clang (removed from zuul) [92]
 o gtls: check return code for gnutls_alpn_set_protocols [86]
 o hash: lazy-alloc the table in Curl_hash_add() [54]
 o http2:set_transfer_url() return early on OOM [53]
 o HTTP3: update quiche build instructions [37]
 o http: enable haproxy support for hyper backend [20]
 o http: Fix CURLOPT_HTTP200ALIASES [89]
 o http_proxy: don't close the socket (too early) [100]
 o insecure.d: detail its use for SFTP and SCP as well [32]
 o insecure.d: expand and clarify [28]
 o libcurl-multi.3: "SOCKS proxy handshakes" are not blocking
 o libcurl-security.3: mention address and URL mitigations
 o libssh2: fix error message for sha256 mismatch
 o libtest: avoid "assignment within conditional expression" [84]
 o lift: ignore is a deprecated config option, use ignoreRules [35]
 o linkcheck.yml: add CI job that checks markdown links [82]
 o m4/curl-compilers: tell clang -Wno-pointer-bool-conversion [99]
 o Makefile.m32: rename -winssl option to -schannel and tidy up [33]
 o mbedTLS: add support for CURLOPT_CAINFO_BLOB [44]
 o mbedtls: fix CURLOPT_SSLCERT_BLOB [72]
 o mbedtls: fix private member designations for v3.1.0 [93]
 o misc: remove unused doh flags when CURL_DISABLE_DOH is defined [71]
 o misc: s/e-mail/email [74]
 o multi: cleanup the socket hash when destroying it [55]
 o multi: handle errors returned from socket/timer callbacks [52]
 o multi: shut down CONNECT in Curl_detach_connnection [2]
 o netrc.d: edit the .netrc example to look nicer [24]
 o ngtcp2: verify the server cert on connect (quictls) [102]
 o ngtcp2: verify the server certificate for the gnutls case [101]
 o nss:set_cipher don't clobber the cipher list [38]
 o openldap: implement STARTTLS [56]
 o openldap: process search query response messages one by one [50]
 o openldap: several minor improvements [69]
 o openldap: simplify ldif generation code [77]
 o openssl: check the return value of BIO_new() [43]
 o openssl: define HAVE_OPENSSL_VERSION for OpenSSL 1.1.0+
 o openssl: remove `RSA_METHOD_FLAG_NO_CHECK` handling if unavailable
 o openssl: remove usage of deprecated `SSL_get_peer_certificate`
 o openssl: use non-deprecated API to read key parameters
 o page-footer: add a mention of how to report bugs to the man page
 o page-footer: document more environment variables [23]
 o request.d: refer to 'method' rather than 'command' [59]
 o retry-all-errors.d: make the example complete
 o runtests: make the SSH library a testable feature
 o rustls: read of zero bytes might be okay [9]
 o rustls: remove comment about checking handshaking [15]
 o rustls: remove incorrect EOF check [10]
 o sha256/md5: return errors when init fails [79]
 o socks5: use appropriate ATYP for numerical IP address host names [91]
 o test1156: enable for hyper [65]
 o test1156: fixup the stdout check for Windows [60]
 o test1525: tweaked for hyper [64]
 o test1526: enable for hyper [63]
 o test1527: enable for hyper [62]
 o test1528: enable for hyper [61]
 o test1554: adjust for hyper [49]
 o test1556: adjust for hyper [48]
 o test302[12]: run only with the libssh2 backend [8]
 o test661: enable for hyper [66]
 o tests/CI.md: add more information on CI environments [39]
 o tests/data/test302[12]: fix MSYS2 path conversion of hostpubsha256 [76]
 o tftp: mark protocol as not possible to do over CONNECT [25]
 o tool_findfile: updated search for a file in the homedir [46]
 o tool_operate: only set SSH related libcurl options for SSH URLs [11]
 o tool_operate: warn if too many output arguments were found [87]
 o url.c: fix the SIGPIPE comment for Curl_close [4]
 o url: check ssl_config when re-use proxy connection [81]
 o url: reduce ssl backend count for CURL_DISABLE_PROXY builds [96]
 o urlapi: accept port number zero [34]
 o urlapi: if possible, shorten given numerical IPv6 addresses [95]
 o urlapi: provide more detailed return codes [36]
 o urlapi: reject short file URLs [41]
 o version_win32: Check build number and platform id
 o vtls/rustls: adapt to the updated rustls_version proto [19]
 o writeout: fix %{http_version} for HTTP/3 [7]
 o x509asn1: return early on errors [67]
 o zuul.d: update rustls-ffi to version 0.8.2 [5]
 o zuul: fix quiche build pointing to wrong Cargo [104]

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