Ask HN: Language/framework pros and cons for writing a web server nowadays?

I'm not looking for "best," but I would like to hear what you guys would consider for choosing between some of the modern languages/frameworks.

Despite the flak that PHP gets, many successful web servers have traditionally been written using PHP, and with modern frameworks like Laravel which use PHP's OOP features it seems acceptable.

There are also great Python frameworks like Django, Flask and Pyramid (I love Flask, and I don't see much talk about Django these days).

Rails seems like it has always been a top choice, even recently.

I also frequently see articles touting Java as a robust web server choice.

What do you guys think?