鱼漂 (一直漂)

Free Software and Open Source projects have a long tradition of forks and duplicate efforts. We enjoy "doing it ourselves", no matter if someone else has done something very similar already.

 Alternative libraries that cover parts of libcurl's features:

libcurl (MIT)

  a highly portable and easy-to-use client-side URL transfer library,   supporting FTP, FTPS, HTTP, HTTPS, SCP, SFTP, TELNET, DICT, FILE, TFTP and   LDAP.  libcurl also supports HTTPS certificates, HTTP POST, HTTP PUT, FTP   uploading, kerberos, HTTP form based upload, proxies, cookies, user+password   authentication, file transfer resume, http proxy tunnelling and more!

libghttp (LGPL)

  Having a glance at libghttp (a gnome http library), it looks as if it works   rather similar to libcurl (for http). There's no web page for this and the   person who's email is mentioned in the README of the latest release I found   claims he has passed the leadership of the project to "eazel". Popular   choice among GNOME projects.

libwww (W3C license) comparison with libcurl

  More complex, and and harder to use than libcurl is. Includes everything   from multi-threading to HTML parsing. The most notable transfer-related   feature that libcurl does not offer but libwww does, is caching.

libferit (GPL)

  C++ library "for transferring files via http, ftp, gopher, proxy server".   Based on 'snarf' 2.0.9-code (formerly known as libsnarf).  Quote from   freshmeat: "As the author of snarf, I have to say this frightens   me. Snarf's networking system is far from robust and complete. It's probably   full of bugs, and although it works for maybe 85% of all current situations,   I wouldn't base a library on it."

neon (LGPL)

  An HTTP and WebDAV client library, with a C interface. I've mainly heard   and seen people use this with WebDAV as their main interest.

libsoup (LGPL)  comparison with libcurl

 Part of glib (GNOME). Supports: HTTP 1.1, Persistent connections,  Asynchronous DNS and transfers, Connection cache, Redirects, Basic, Digest,  NTLM authentication, SSL with GnuTLS, Proxy support including SSL, SOCKS  support, POST data. Not portable. Lacks: cookie support, NTLM for proxies,  GSS, gzip encoding, trailers in chunked responses, portability and more.

mozilla netlib (MPL)

  Handles URLs, protocols, transports for the Mozilla browser.

mozilla libxpnet (MPL)

Minimal download library targeted to be much smaller than the above   mentioned netlib. HTTP and FTP support.

wget (GPL)

  While not a library at all, I've been told that people sometimes extract the   network code from it and base their own hacks from there.

libfetch (BSD)

 Does HTTP and FTP transfers (both ways), supports file: URLs, and an API for  URL parsing. The utility fetch that is built on libfetch is an  integral part of the FreeBSD operating  system.

HTTP Fetcher (LGPL)

"a small, robust, flexible library for downloading files via HTTP using the GET method."

http-tiny (Artistic License)

"a very small C library to make http queries (GET, HEAD, PUT, DELETE, etc.) easily portable and embeddable"

wininet comparison with libcurl

"The Windows Internet (WinINet) application programming interface (API)   enables applications to interact with Gopher, FTP, and HTTP protocols to   access Internet resources."

XMLHTTP Object also known as IXMLHTTPRequest (part of MSXML 3.0)

 (Windows) Provides client-side protocol support for communication with HTTP  servers. A client computer can use the XMLHTTP object to send an arbitrary  HTTP request, receive the response, and have the Microsoft® XML Document  Object Model (DOM) parse that response.

QHttp (GPL)

 QHttp is a class in the Qt library from Troll Tech. Seems to be restricted  to plain HTTP. Supports GET, POST and proxy. Asynchronous.

ftplib (GPL)

 "a set of routines that implement the FTP protocol. They allow  applications to create and access remote files through function calls instead  of needing to fork and exec an interactive ftp client program."

ftplibpp (GPL)

 A C++ library for "easy FTP client functionality. It features resuming of up-  and downloads, FXP support, SSL/TLS encryption, and logging functionality."

GNU Common C++ library

Has a URLStream class. This C++ class allow you to download a file using HTTP. See demo/urlfetch.cpp in commoncpp2-1.3.19.tar.gz

HTTPClient (LGPL)

Java HTTP client library.

Jakarta Commons HttpClient (Apache License)

A Java HTTP client library written by the Jakarta project.

gnetlibrary (LGPL)

"a simple network library. It is written in C, object-oriented, and built   upon GLib. It is intended to be easy to use and port". Features a HTTP   component. It uses glib, and integrates very well within Gtk+ applications,   which require event-driven programming.

 Have you tried programming with one of the other libs and care share your experiences? We'd love to make this collection more complete and feature lengthier comments about each lib.