cURL 7.50.2 发布了，cURL是一款著名的字符界面下的下载工具（腾云科技ty300.com），支持HTTP、HTTPS、FTP、FTPS、DICT、TELNET、LDAP、FILE,和 GOPHER。此外还具有cookies支持、断点续传、FTP上传、密码支持、SSL支持和代理支持等特性（基础教程qkxue.net）。curl同时还提供了一套libcurl的 库，开发者可以基于这个库开发其他下载工具。

本次发布改进如下：

mbedtls: Added support for NTLM
SSH: fixed SFTP/SCP transfer problems
multi: make Curl_expire() work with 0 ms timeouts
mk-ca-bundle.pl: -m keeps ca cert meta data in output
TFTP: Fix upload problem with piped input
CURLOPT_TCP_NODELAY: now enabled by default
mbedtls: set verbose TLS debug when MBEDTLS_DEBUG is defined
http2: always wait for readable socket
cmake: Enable win32 large file support by default
cmake: Enable win32 threaded resolver by default
winbuild: Avoid setting redundant CFLAGS to compile commands
curl.h: make CURL_NO_OLDIES define CURL_STRICTER
docs: make more markdown files use .md extension
docs: CONTRIBUTE and LICENSE-MIXING were converted to markdown
winbuild: Allow changing C compiler via environment variable CC
rtsp: accept any RTSP session id
HTTP: retry failed HEAD requests on reused connections too
configure: add zlib search with pkg-config
openssl: accept subjectAltName iPAddress if no dNSName match
MANUAL: Remove invalid link to LDAP documentation
socks: improved connection procedure
proxy: reject attempts to use unsupported proxy schemes
proxy: bring back use of "Proxy-Connection:"
curl: allow "pkcs11:" prefix for client certificates
spnego_sspi: fix memory leak in case *outlen is zero
SOCKS: improve verbose output of SOCKS5 connection sequence
SOCKS: display the hostname returned by the SOCKS5 proxy server
http/sasl: Query authentication mechanism supported by SSPI before using
sasl: Don‘t use GSSAPI authentication when domain name not specified
win: Basic support for Universal Windows Platform apps
nss: fix incorrect use of a previously loaded certificate from file
nss: work around race condition in PK11_FindSlotByName()
ftp: fix wrong poll on the secondary socket
openssl: build warning-free with 1.1.0 (again)
HTTP: stop parsing headers when switching to unknown protocols
test219: Add http as a required feature
TLS: random file/egd doesn‘t have to match for conn reuse
schannel: Disable ALPN for Wine since it is causing problems
http2: make sure stream errors don‘t needlessly close the connection
http2: return CURLE_HTTP2_STREAM for unexpected stream close
darwinssl: --cainfo is intended for backward compatibility only
speed caps: not based on average speeds anymore
configure: make the cpp -P detection not clobber CPPFLAGS
http2: use named define instead of magic constant in read callback
http2: skip the content-length parsing, detect unknown size
http2: return EOF when done uploading without known size
darwinssl: test for errSecSuccess in PKCS12 import rather than noErr
openssl: fix CURLINFO_SSL_VERIFYRESULT
下载地址：https://curl.haxx.se/download.html

cURL字符界面下载工具