[Question]: What does goreplay mean by what it records into the file

[xngc]

`
1 e2fc276600000001c87f7977 1691507071737642000 0

GET / HTTP/1.1
Host: localhost:10086
Connection: keep-alive
sec-ch-ua: "Not/A)Brand";v="99", "Google Chrome";v="115", "Chromium";v="115"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "macOS"
Upgrade-Insecure-Requests: 1
`
What do the four items in the first row mean