1.2. A is...
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Apache.
(The most common web-server on the Internet. Highly configurable and
extensible.)
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AOLserver.
(A Tcl-enabled feature-rich web-server created by America On-Line).
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thttpd
(Tiny/Turbo/Throttling HTTP Server)
-
Roxen
And even:
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Perl's HTTP::Daemon and friends in other languages.
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TUX (a web-server in the kernel)
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Microsoft's IIS.
Written by Shlomi Fish