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Web Servers

Web Servers communicate with client browsers on one side - and with server-side programs and databases on the other.
There are many web servers out there.  Some are written in 300 lines of Perl code. - Plexus web server (httpd) written in perl (~1996) - perl server (Marc VanHeyningen) - - web server in perl (~2000) - - Frontier::RPC allows you to make servers - RoBridge Perl Server - perl application server - contest of servers (in Perl)

Others are big 40 MB multi-threaded monsters.
There are even web servers written completely in Java (they are usually slow).
There is evidence that web servers can handle 10,000 simultaneous clients:

There are many reviews comparing the web servers - for example read here:
Look at the latest survey of the web-servers used on the internet today here: .
You can usually easily find what server is running behind a particular web site by using netcraft .

Most commonly used web servers are:
Apache (~60% of the Internet) - - the best, has modules to work with Java, Perl, PHP, etc.
IIS (Microsoft Internet Information Server) -
iPlanet-WebServer-Enterprise (former Netscape Enterprise)  -
AOL Server - - read also on

Talking about reliability and large enterprise systems, you may read this:
     ( - Netscape enterprise docs )