Projects / aria2

aria2

aria2 is a utility for downloading files. The supported protocols are HTTP(S), FTP, BitTorrent, and Metalink. It has a powerful segmented downloading ability, downloading a file from multiple sources and multiple protocols and utilizing your download bandwidth to the maximum. It supports downloading a file from HTTP(S)/FTP and BitTorrent at the same time, while the data downloaded from HTTP(S)/FTP is uploaded to the BitTorrent swarm. Using Metalink's chunk checksums, aria2 automatically validates chunks of data while downloading a file like BitTorrent.

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RSS Recent releases

  •  30 Mar 2014 14:15

Release Notes: This release fixes a BitTorrent download failure on the Mingw build.

Release Notes: This release adds a new RPC authorization mechanism using the --rpc-secret option. The existing --rpc-user and --rpc-passwd options are now deprecated, and all applications using the RPC API are strongly encouraged to migrate to the new mechanism. See the RPC INTERFACE section in the aria2 manual page for the details. A new RPC method, aria2.saveSession, was added, which tells the aria2 server to save session file immediately. There are several enhancements and bugfixes.

  •  05 Jan 2014 15:34

Release Notes: This release fixes the bug which may cause assertion failure after multi-file downloads (e.g., multi-file metalink or torrent) are performed several times due to the bad handling of the --bt-max-open-files option.

Release Notes: This release fixes the wrong handling of return value of fork(), which leads to high CPU usage. The progress readout has some color output. The Mingw32 build now receives colorized outputand can read Unicode commandline arguments. The build script for OS X has been rewritten. --bt-max-open-files now limits the number of opened file globally for multi-file downloads instead of on a per-download basis.

Release Notes: This release fixes the percent-encoding bug which affects filename encodings. It adds PKCS12 support in certificate importation. It also adds an experimental internal implementation of the message digest functions ARC4 cipher and bignum. This means that no external libraries are required to build BitTorrent support, but this feature is still marked as experimental. This release also fixes the Android build with NDK r9.

RSS Recent comments

12 Oct 2010 13:48 deed02392 Thumbs up

Awesome segmented downloading abilities, could be improved if you could implement the ability to operate on multiple interfaces. Even if this was tied to a particular protocol, it would be awesome to be able to balance networking load on the software level rather than requiring expensive equipment or complicated server set ups.

17 Nov 2007 21:56 bug1

Re: anti-social software

> Segmented downloads use multiple (2, 4,

> sometimes a hundred) requests tot he

> same server.

I think what your talking about is more accurately termed "download accelerators".

Segmented downloads does not imply the same server, bittorrent for example could be considered segmented download.

The whole point of metalink is to desribe multiple sites that contain the whole file, if there are multiple servers then it makes no sense for a client to load lots of requests on just one server.

17 Nov 2007 17:21 pcg1 Thumbs down

Re: anti-social software
% Fragmented downloading leads to a

The description and my comment both clearly talk about segmented downloads. Segmented downloads use multiple (2, 4, sometimes a hundred) requests tot he same server.

Using them of course reduces bandwidth for everybody due to the excessive overhead due to multiple tcp connections and requests, and there is no load balancing, the only effect is that it results more or less in a denial-of-service attack to some servers that cnanot cope with hundreds of requests.

> This type of downloading is a beneficial
> evolution of these old protocols.

Segmented downloads (as opposed to what you are tlaking about) is what aria2 claims to implement, and those are neither beneficial nor anything new. Its anti-social, as I said before. Supporting sofwtare thta supports it is anti-social, too.

17 Nov 2007 15:42 bug1

Re: anti-social software

> when using this software, keep in mind

> that segmented downloads increase the

> load on the server and the network and

> actually increases bandwith at the cost

> of others. in the end, when most people

> use this horrible hack, everybody will

> have slower download rates as a result.

>

> best do not support this kind of

> software.

Any bandwidth increases would be due to more requests per downloaded byte, and would only be a fraction of a percent.

Fragmented downloading leads to a natural load balancing as data ends up being downloaded from servers with the most capacity rather than overloading the primary site.

This type of downloading is a beneficial evolution of these old protocols.

28 Mar 2007 19:35 pcg1 Thumbs down

anti-social software
when using this software, keep in mind that segmented downloads increase the load on the server and the network and actually increases bandwith at the cost of others. in the end, when most people use this horrible hack, everybody will have slower download rates as a result.

best do not support this kind of software.

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