HTTP keep-alive with TCP in Go - http

Question

I'm trying TCP in Go and trying to make an HTTP call from a TCP client to another HTTP server.
I run another HTTP server locally.
I noticed that whenever the header connection: close is present in the request, the TCP client can read the whole response from the HTTP server.
However, when the header connection: close is not present in the request, only the header part is read from the connection. The body is not read even though the HTTP server returns a body.
Here is the client code
package main
import (
"bufio"
"bytes"
"fmt"
"log"
"net"
)
func main() {
con, err := net.Dial("tcp", "127.0.0.1:8080")
if err != nil {
log.Fatalln(err)
}
defer con.Close()
serverReader := bufio.NewScanner(con)
buf := bytes.Buffer{}
buf.WriteString("GET / HTTP/1.1\n")
buf.WriteString("Content-Type: text/hmtl\n")
//buf.WriteString("Connection: close\n")
buf.WriteString("User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.134 Safari/537.36\n")
buf.WriteString("Accept: */*\n")
buf.WriteString("Host: 127.0.0.1\n")
buf.WriteString("Accept-Encoding: gzip, deflate, br\n\n")
if _, err = con.Write(buf.Bytes()); err != nil {
log.Printf("failed to send the client request: %v\n", err)
}
//Waiting for the server response
for serverReader.Scan() {
fmt.Println(serverReader.Text())
}
}
server code
package main
import (
"log"
"net/http"
"time"
)
func main() {
var handler http.HandlerFunc = func(w http.ResponseWriter, r *http.Request) {
log.Println("request received")
if r.URL.String() == "/path" {
w.WriteHeader(400)
return
}
w.WriteHeader(200)
w.Header().Set("Content-Type", "application/json")
w.Write([]byte("hello"))
w.Write([]byte("hi"))
time.Sleep(time.Millisecond * 10)
w.Write([]byte("how're you"))
return
}
http.ListenAndServe(":8080", handler)
}
Could you help me with reading the response body ven