One of the big items on my todo-list is to play a bit with aws (the Ada web server):

http://libre.adacore.com/tools/aws/

I've no idea what the architecture is like, but being Ada, I'm pretty hopeful it delivers some nice guarantees (or at least hefty promises) regarding reliability.

An hello-world example web server:

  https://en.wikibooks.org/wiki/Ada_Programming/Libraries/Web/AWS

An outdated, probably flawed (aren't they all) benchmark:

  http://wiki.ada-dk.org/aws_vs_node.js

If nothing else it seems to indicate that aws isn't hopelessly slow.

There's also awa - the Ada web framework. I've yet to play with it, but it would appear to be relevant:

  http://code.google.com/p/ada-awa/

According to a stack overflow answer[s], Ada also comes with a spitbol-package, allowing you to use spitbol/snobol rather than regexpes for pattern matching. See eg the bottom of:

  http://www.adacore.com/adaanswers/gems/gem-26-2/

[s] http://stackoverflow.com/questions/5904053/web-programming-i...

Are you aware of Ada Web Server (AWS)?

http://www.adacore.com/adaanswers/gems/gem-29/