Request and Response Anatomy

Part of the Web course

You already know that a browser sends a request and a server sends back a response. What you have not seen yet is what those two things actually look like on the wire, the plain text a server receives and the plain text a client receives back. Once you can read that raw shape, a lot of stuff that used to feel like magic (why a page 404s, why a login form fails silently, why an API rejects your request) becomes...

The good news is that there are only two shapes to learn, and they are nearly the same shape. Every request looks like a first line, a stack of headers, a blank line, and maybe a body. Every response looks like exactly the same thing, first line, headers, blank line, maybe a body. Learn that shape once and you can read both directions of every HTTP exchange you will ever see. ...