What kind of language are you using ? The most successful implementation of an HTTP parser that I have seen in terms of correctness/time-to-implement was done

What kind of language are you using ? The most successful implementation of an HTTP parser that I have seen in terms of correctness/time-to-implement was done using Ragel for the mongrel ruby web server (see http://rubygems.org/gems/mongrel http://rubygems.org/gems/mongrel ). I have to look back again but if I remember well, the parser was written and validated with fuzzy testing in a week or so and then was pretty much stable. That was just for the parsing and the rest of the web server took a couple more months to stabilize.