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That depends on your view. I'd much rather something more modern (YAWS, Ngix, Mongrel) be the most popular.

Here is some good insight into why Apache is better for a lot of implementations: http://stackoverflow.com/questions/195534/in-production-apac...

Oh, I am not sure I understand it deeply but is it just applicable to mod_wsgi or does FastCGI or PHP-FPM suffer from a similar behavior?

(Apologies if the question is naive or dumb)

Don't know about that specific problem, but mod_php is faster than php-fpm or fastcgi: http://blog.a2o.si/2009/06/24/apache-mod_php-compared-to-ngi...

I know nginx doesn't completely implement HTTP 1.1. To be technical, it doesn't support chunked transfer encoding for request bodies.

So we still need feature-ful web servers (well at least I do).