How to get all Cookies after a GET request?

Question

Java

I open the site page in chrome, I immediately look at the cookies in the developer tools (Network -> Cookies):


Of those on the screen, I can only get JSESSIONID.

Further on Network -> Headers for the same request:

1) What put down all these headings? After all, as I understand it, they were put BEFORE the request, and not after, if not, then why are they in Request Headers ?

Accordingly, I get only Response Headers in the script, which is logical in principle, but then it's not clear where the rest of the cookies are?


Cookies to output stream:

class Main {
    static void main(String[] args) {
        URL myUrl = new URL("https://example.ru/index.html")
        URLConnection urlConn = myUrl.openConnection()
        urlConn.connect()

        def temp = null

        for (int i = 1; urlConn.getHeaderFieldKey(i) != null; i++) {
            println("${urlConn.getHeaderFieldKey(i)} : ${urlConn.getHeaderField(i)}")
        }
    }
}