TCP to HTTP Part 4

Описание: In today’s episode of our TCP → HTTP series, we’re diving into one of the most crucial parts of the HTTP protocol — parsing request headers.

We already broke down the Request Line, and now it’s time to understand what comes next:
✔ What exactly are “headers” (or field-lines as the RFC calls them)?
✔ How whitespace works in HTTP headers
✔ What counts as a valid vs invalid header
✔ Why no spaces are allowed between the field-name and the colon
✔ How to parse headers cleanly and safely in Go
✔ Writing a reusable Headers type and Parse() method
✔ Understanding how the parser consumes data one header at a time
✔ Implementing test cases (headers_test.go) just like real-world HTTP servers do

We’ll walk through:
🔹 Creating a new headers package
🔹 Building a Headers map
🔹 Parsing raw bytes into key-value pairs
🔹 Handling CRLF correctly
🔹 Detecting the end of headers
🔹 Returning (n, done, err) just like pro parsers
🔹 Passing strict RFC-style tests (including failing cases like Host : value)

By the end of the video, you’ll understand:
✨ How real HTTP servers parse header lines
✨ Why RFC rules exist
✨ How to write a robust streaming parser
✨ And how to detect formatting errors properly

If you're learning Go, building servers, or just love understanding the behind-the-scenes magic of HTTP, this video is for you! 💥

Don’t forget to Like ❤️, Subscribe 🔔, and drop a comment if you want the next episode on parsing the body or building HTTP responses.