I assume you meant "a webserver implented in a language meant to be run by a web browser".
Oh, I don't know if the original purpose of a language is really significant. Java was initially pushed also as a client-side technology (remember the infamous applets?). Perl was initially a scripting language, meant as a replacement for Bash. Lisp was designed as a language to make mathematical computations, and used for artificial intelligence. Python was designed for learning. Ruby was also created as a scripting language. All of these have been used successfully in web servers.
Besides, I think this retooling is kind of cool. When I first saw your message I misread:
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