Go で「net.Conn」からデータをチャンクで読み取る方法は?

package main

import (
    "bufio"
    "fmt"
    "net"
)

func main() {
    conn, err := net.Dial("tcp", "google.com:80")
    if err != nil {
        fmt.Println("dial error:", err)
        return
    }
    defer conn.Close()

    // Create a bufio.Reader from the net.Conn
    reader := bufio.NewReader(conn)

    // Read data in chunks until the end of the packet
    buf := []byte{}
    for {
        chunk, err := reader.ReadSlice('\n')
        if err != nil {
            if err != io.EOF {
                fmt.Println("read error:", err)
            }
            break
        }
        buf = append(buf, chunk...)
    }
    fmt.Println("total size:", len(buf))
    // fmt.Println(string(buf))
}

package main

import (
    "bytes"
    "fmt"
    "io"
    "net"
)

func main() {
    conn, err := net.Dial("tcp", "google.com:80")
    if err != nil {
        fmt.Println("dial error:", err)
        return
    }
    defer conn.Close()

    // Create a bytes.Buffer to accumulate incoming data
    var buf bytes.Buffer

    // Copy data from the net.Conn to the Buffer
    if _, err = io.Copy(&buf, conn); err != nil {
        fmt.Println("copy error:", err)
    }

    fmt.Println("total size:", buf.Len())
}