HTTP, end to end

What you'll learn

• Reading a request and a response, line by line
• The headers worth knowing, and what they do
• Cookies, sessions, and the security flags that matter
• CORS — preflight, credentials, and the common traps
• HTTP caching, all the way down
• Debugging from the browser's network panel

1. 01
   What a request is

   Methods, paths, headers, body — the bytes you actually send.
   12 min
2. 02
   What a response is

   Status, headers, body — and why the status code matters most.
   12 min
3. 03
   Headers worth knowing

   Content-Type, Accept, Authorization, Cookie — the daily ten.
   14 min
4. 04
   Cookies and sessions

   Set-Cookie, SameSite, HttpOnly, and the security flags that matter.
   14 min
5. 05
   CORS, demystified

   Preflight, simple requests, and the headers that make it work.
   16 min
6. 06
   Caching

   Cache-Control, ETag, 304, and shared vs private caches.
   16 min
7. 07
   HTTPS in five minutes

   What TLS gives you, what it doesn't, and what 'mixed content' is.
   12 min
8. 08
   Status codes, in practice

   Pick the right one. Stop returning 200 with an error body.
   13 min
9. 09
   HTTP/2 and HTTP/3

   What changed, what you need to care about.
   12 min
10. 10
    Debugging from the network panel

    What to look for, in what order.
    13 min