HttpKernel middlewaresHttpKernel middlewares A brief history of language-specific HTTP interfaces 1997: Java Servlet 2003: Python WSGI 2007: Ruby Rack 2009: Perl PSGI 2011: Symfony2 HttpKernelInterface Rack as an interface From the aforementioned interfaces, I’m most familiar with Rack. And in fact, Rack seems the closest to what Symfony2 brings to the PHP world. So what is Rack all about? Here’s a basic hello world fr
