How to parse HTTP Requests/Responses at the byte level?

Question

Parsing

Can you share your experience on how to parse the byte array coming from the browser.
Right now I'm splitting the data into start line, headers and body by looking for the character "\n" .
In the same way, I separate the start line into a method, uri, HTTP version.
The code is very large.
I will be grateful for any help.

Answer 1

Low level code and should be big.

Answer 2

regex

Answer 3

I immediately wanted to offer Netty as a solution, but you are parsing information from the browser. Can you please clarify what you mean by chrome extension?
Thank you.