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# GNU Wget2 - Introduction

GNU Wget2 is the successor of GNU Wget, a file and recursive website downloader.

Designed and written from scratch it wraps around libwget, that provides the basic
functions needed by a web client.

Wget2 works multi-threaded and uses many features to allow fast operation.

In many cases Wget2 downloads much faster than Wget1.x due to HTTP2, HTTP compression,
parallel connections and use of If-Modified-Since HTTP header.

GNU Wget2 is licensed under GPLv3+.

Libwget is licensed under LGPLv3+.


# Features

A non-exhaustive list of features

- Support for HTTP/1.1 and HTTP/2.0 protocol
- [brotli](https://github.com/google/brotli) decompression support (Accept-Encoding: br)
- [zstandard](https://github.com/facebook/zstd) decompression support, RFC8478 (Accept-Encoding: zstd)
- [lzip](https://www.nongnu.org/lzip/) decompression support, (Accept-Encoding: lzip)
- HPKP - HTTP Public Key Pinning (RFC7469) with persistent database
- TCP Fast Open for plain text *and* for HTTPS
- TLS Session Resumption including persistent session data cache
- TLS False Start (with GnuTLS >= 3.5.0)
- HTTP2 support via nghttp2 and GnuTLS ALPN including streaming/pipelining
- OCSP stapling + OCSP server querying as a fallback (experimental, needs GnuTLS >= 3.3.11)
- Use [libpsl](https://github.com/rockdaboot/libpsl) for cookie domain checking (using Public Suffix List)
- Support link conversion (-k/--convert-links and -K/--backup-converted)
- Support for RFC 6266 compliant Content-Disposition
- RFC 6797 HSTS (HTTP Strict Transport Security)
- Support for bzip2 Content-Encoding / Accept-Encoding compression type
- New Year 2014 gimmick: added support for XZ Content-Encoding / Accept-Encoding compression type
- Character encoding of input files may be specified despite from local and remote encoding (--input-encoding)
- Support scanning RSS 2.0 feeds from local files (`--force-rss -i <filename>`)
- Support scanning RSS 2.0 feeds.
- Support scanning Atom 1.0 feeds from local files (`--force-atom -i <filename>`)
- Support scanning Atom 1.0 feeds.
- Support scanning URLs from local Sitemap XML file (`--force-sitemap -i <filename>`)
- Support scanning sitemap files given in robots.txt (Sitemap XML, gzipped Sitemap XML, plain text) including
sitemap index files.
- Support arbitrary number of proxies for parallel downloads
- Multithreaded download of single files (option --chunk-size)
- Internationalized Domain Names in Applications (compile-selectable IDNA2008 or IDNA2003)
- ICEcast / SHOUTcast support via library (see examples/getstream.c)
- respect /robots.txt "Robot Exclusion Standard" and `<META name="robots" ...>`
- new option --secure-protocol=PFS to have TLS only plus forcing Perfect Forward Secrecy (PFS)
- IDN support for international domains
- autotools support
- proxy support
- cookies (session/non-session), detection of supercookies via Mozilla Public Suffix List
  (use the new option `--cookie-suffixes <filename>`, better: put it into ~/.wgetrc)
- recursive download of websites with or without spanning hosts
- download of single web pages / resources
- zlib/gzip compressed HTTP/HTTPS downloads (gzip, deflate)
- number of parallel download threads is adjustable
- include directive for config files (wildcards allowed)
- support for keep-alive connections
- included CSS, HTML, XML parser needed for recursive downloads
- gettext support
- HTTPS via libgnutls (and basic WolfSSL support)
- support for Metalink RFC 6249 (Metalink/HTTP: Mirrors and Hashes)
- support for Metalink RFC 5854 (Metalink Download Description Format / .meta4 files)
- support for Metalink 3
- Metalink checksumming via libgnutls
- DNS lookup cache
- IPv4 and IPv6 support
- built and tested on Linux, OSX, OpenBSD, FreeBSD, Solaris, Windows


# Links

[Online Docs](https://gnuwget.gitlab.io/wget2/reference/)

[Mailing List](https://savannah.gnu.org/mail/?group=wget)

[Bug Tracker](https://gitlab.com/gnuwget/wget2/issues)

[Development](https://gitlab.com/gnuwget/wget2)

[Code Coverage](https://gnuwget.gitlab.io/wget2/coverage/)

[Fuzz Code Coverage](https://gnuwget.gitlab.io/wget2/fuzz-coverage/)


# Build Requirements

The following packages are needed to build the software

* autotools (autoconf, autogen, automake, autopoint, libtool)
* python (recommended for faster bootstrap)
* rsync
* tar
* makeinfo (part of texinfo)
* pkg-config >= 0.28 (recommended)
* doxygen (for creating the documentation)
* pandoc (for creating the wget2 man page)
* gettext >= 0.18.2
* libiconv (needed for IRI and IDN support)
* libz >= 1.2.3 (the distribution may call the package zlib*, eg. zlib1g on Debian)
* liblzma >= 5.1.1alpha (optional, if you want HTTP lzma decompression)
* libbz2 >= 1.0.6 (optional, if you want HTTP bzip2 decompression)
* libbrotlidec/libbrotli >= 1.0.0 (optional, if you want HTTP brotli decompression)
* libzstd >= 1.3.0 (optional, if you want HTTP zstd decompression)
* libgnutls (3.3, 3.5 or 3.6)
* libidn2 >= 0.14 (libidn >= 1.25 if you don't have libidn2)
* flex >= 2.5.35
* libpsl >= 0.5.0
* libnghttp2 >= 1.3.0 (optional, if you want HTTP/2 support)
* libmicrohttpd >= 0.9.51 (optional, if you want to run the test suite)
* lzip (optional, if you want to build distribution tarballs)
* lcov (optional, for coverage reports)
* libgpgme >= 0.4.2 (optional, for automatic signature verification)
* libpcre | libpcre2 (optional, for filtering by PCRE|PCRE2 regex)
* libhsts (optional, to support HSTS preload lists)
* libwolfssl (optional, to support WolfSSL instead of GnuTLS)

The versions are recommended, but older versions may also work.


# Downloading and building from tarball

		wget https://gnuwget.gitlab.io/wget2/wget2-latest.tar.gz
		tar xf wget2-latest.tar.gz
		cd wget2-*
		./configure
		make
		make check
		sudo make install


# Building from git

Download project and prepare sources with

		git clone https://gitlab.com/gnuwget/wget2.git
		cd wget2
		./bootstrap
		# on shell failure try 'bash ./bootstrap'

Build Wget2 with

		./configure
		make

In Haiku build Wget2 with

        setarch x86
        ./configure --prefix=/boot/home/config/non-packaged
        rm /boot/home/config/non-packaged/wget2 && mv /boot/home/config/non-packaged/wget2_noinstall /boot/home/config/non-packaged/wget2

Test the functionality

		make check

Install Wget2 and libwget

		sudo make install (or su -c "make install")

# License

Copyright (C) 2015-2021 Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA.