Ask HN:Resource to learn "web development" independent of a language/framework

Can you guys suggest some good resources (online/offline) to learn web development which is more focussed on the concepts,workflow etc of a web application and not just using a specific language/framework ?

For example, I want to learn the core and depth of:

- How do components of a typical web app architecture interact and what they really mean? Things slike client, server, databases etc.

- Specifications such as WSGI,cgi etc ?<p>- All about sessions including client side, server side, best practices ,cookies etc.

- Request, response and how they really work (again independent of a specific language).

Basically, the depth of building web apps not just high level frameworks etc. Just wondering if there is a good resource. Not interested in front end design though. I already know enough to build CRUD apps (i use python/flask specifically) but really want to get into more depth.