Why is the web server not responding?

Question

go

Started learning http protocol. In theory, after sending the headers, the server should at least return something. But as usual, everything is in my ass :D

package main

import "net"
import "fmt"

import "bufio"
import "log"



func main() {
  conn, err := net.Dial("tcp", "127.0.0.1:80")
  if err != nil {
    log.Fatal(err)
  }

  fmt.Fprintf(conn, "GET /adm/ HTTP/1.1")
  fmt.Fprintf(conn, "Host: localhost")
  fmt.Fprintf(conn, "User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:38.0) Gecko/20100101 Firefox/38.0")
  fmt.Fprintf(conn, "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
  fmt.Fprintf(conn, "Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3")
  fmt.Fprintf(conn, "Connection: close")
  for {
    message, err := bufio.NewReader(conn).ReadString('\n')
    if err != nil {
      log.Fatal(err)
    }
    fmt.Print("Message from server: " + message)
  }
}

Thanks in advance

Answer 1

Add \r\n to the end of each line, and after the entire query, do it again. Otherwise, the server will not understand how to separate the headers among themselves and how to determine the end of the request.

package main

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

func main() {
  conn, err := net.Dial("tcp", "ya.ru:80")
  if err != nil {
    log.Fatal(err)
  }

  fmt.Fprintf(conn, "GET / HTTP/1.1\r\n")
  fmt.Fprintf(conn, "Host: localhost\r\n")
  fmt.Fprintf(conn, "User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:38.0) Gecko/20100101 Firefox/38.0\r\n")
  fmt.Fprintf(conn, "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n")
  fmt.Fprintf(conn, "Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3\r\n")
  fmt.Fprintf(conn, "Connection: close\r\n")
  fmt.Fprintf(conn, "\r\n")
  for {
    message, err := bufio.NewReader(conn).ReadString('\n')
    if err != nil {
      log.Fatal(err)
    }
    fmt.Print("Message from server: " + message)
  }
}