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If you need to set up a secure, easily configurable Web server in as short a time as possible, then Abyss Web Server might just be the product for you. In development since 2002, its current version (2.5) runs on Linux, BSD, Windows, and Mac OS X. Its simple installation and setup (no obscure text configuration files) allows you to code your site with PHP, Perl, Python, Ruby, and even ASP.Net, if you're using the Windows version.
Licensing is somewhat peculiar. Abyss isn't open source software, but it provides two versions: X1, which is free, and X2, which costs about $60. The X1 version is almost as fully featured as the X2 one, and it has no restrictions, nag screens, time limits, or any similar behaviors. When you purchase the X2 version, you get a year's worth of free updates and support. After a year you can opt to extend your license (for an additional payment of $25, or $40 for two years' worth) or just keep the latest version.
You'll likely want to try out the free edition before committing to the paid one, so go to the Abyss download site, get the Linux version, and untar it in its own directory (a good choice might be $HOME/bin).
You can run Abyss either directly from the console (and shut it down with Ctrl-C) or as a daemon, by adding the
-d parameter. In any case, you must run it as a common user; if you try to run it as root, Abyss will complain and not run. (Running any Web server as root is usually not a good idea, so this behavior makes sense.)
After you complete the installation, start the software with the command
./abyssws. The server will confirm that it's running on port 8000, and let you know you can configure it at port 9999.
Navigate to http://127.0.0.1:9999 and select the default language. (According to the online documentation, you should be able to choose from among English, French, Arabian, German, Chinese, and more, but only the first three were available when I ran it.) On the next screen, create an Abyss administrator username and password. You must then immediately enter them to get to the configuration form. If everything goes right, you'll see the Abyss Web Server Console, and Abyss will be up and running; navigate to http://127.0.0.1:8000 to check it out.
You'll probably want to change the port Abyss uses to the standard 80; click on Configure (next to "Default host on port 8000") to change that. Here's a brief look at the configuration options you might be interested in:
.phpextension with it. After saving the changes, you will have to restart Abyss, but you can do it directly from the form by clicking on the RESTART button that appears.
After finishing the setup, simply post the Web pages in the Web directory and start running Abyss. You have a fully configured site in just a few minutes.
There is no absolute reason to prefer Abyss over Apache, but then again, there also isn't one to prefer Apache over Abyss! If you need a complicated setup, Apache might be the only solution, but this isn't the case for most sites. One factor working against Abyss is that it isn't open source software, but for many users, that won't matter.
The high performance and low memory requirements of Abyss are an advantage, unless you have seriously potent hardware. Some administrators prefer a Web configuration utility, but that's a matter of taste. The anti-crash architecture, which allows for a fast restart in case of a crash, is an Abyss-only characteristic, but similar workarounds exist for other servers. Abyss handles security-related aspects more easily than Apache, such as the automatic rejection of suspicious URLs, users and groups management, password protection for certain paths, URL rewriting, and Secure Sockets Layer (SSL). If you're not too experienced, your first setup with Abyss will probably be safer than one with other products.
If you move over to the X2 version, you'll get bandwidth control, virtual hosts, and a few more things. You could argue that you get all of these features with Apache, but they won't matter if you don't require them. Even if you have to pay for this version, the cost is low.
Abyss is an interesting product that deserves more than a glance. It can provide a full Web server with no cost, on older hardware, and with high-performance results.