building https proxy failed with error SSL_ERROR_BAD_MAC_READ

Question

I am trying to make an HTTP/HTTPS proxy with Golang like this link. This is all my code : First get command from browser. If it's CONNECT mean HTTPS and make simple TCP socket and let browser continue it. then pipe each connection together.

package main

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

func main() {
    fmt.Println("Start server...")

    ln, _ := net.Listen("tcp", ":8000")

    conn, _ := ln.Accept()
    handleSocket(conn)

}

func handleSocket(client_to_proxy net.Conn) {
    message, e := bufio.NewReader(client_to_proxy).ReadString('\n')
    message = strings.ReplaceAll(message, "\r\n", "")
    if e != nil {
        fmt.Println("ERROR1 ", e)
        return
    }

    splited := strings.Split(message, " ")
    host := strings.Split(splited[1], ":")
    if splited[0] == "CONNECT" {
        proxy_to_server, e := net.Dial("tcp", splited[1])
        if e != nil {
            fmt.Println("ERROR2 ", e)
            return
        }
        lenn, e := client_to_proxy.Write([]byte("HTTP/1.1 200 OK\r\n\r\n"))
        if e != nil {
            fmt.Println("ERROR8 ", e)
            return
        }
        fmt.Println(lenn)

        readAll(client_to_proxy, proxy_to_server)

    } else if splited[0] == "GET" {
        remote_conn, e := net.Dial("tcp", strings.Replace(splited[1][:len(splited[1])-1], "http://", "", 2)+":80")
        if e != nil {
            fmt.Println("ERROR7 ", e)
            return
        }
        _, e = remote_conn.Write([]byte("GET / " + splited[2] + "\r\n" + "Host: " + host[0] + "\r\n\r\n"))
        if e != nil {
            fmt.Println("ERROR6 ", e)
            return
        }
        writeAll(client_to_proxy, remote_conn)
    }
}

func writeAll(client_to_proxy net.Conn, proxy_to_server net.Conn) {
    buffer := make([]byte, 32*1024)
    for {
        readLeng, err := proxy_to_server.Read(buffer)
        if err != nil {
            fmt.Println("ERROR9 ", err)
            return
        }
        if readLeng > 0 {
            _, err := client_to_proxy.Write(buffer)
            if err != nil {
                fmt.Println("ERR4 ", err)
                return
            }
        }
    }
}

func readAll(client_to_proxy net.Conn, proxy_to_server net.Conn) {
    buffer := make([]byte, 32*1024)
    go writeAll(client_to_proxy, proxy_to_server)

    for {
        read, err := client_to_proxy.Read(buffer)
        if err != nil {
            return
        }
        if read > 0 {
            _, err := proxy_to_server.Write(buffer)
            if err != nil {
                fmt.Println("ERR5 ", err)
                return
            }
        }
    }
}

It works OK with HTTP but when trying for HTTPS in Firefox, I receive this error:

Secure Connection Failed

An error occurred during a connection to www.google.com. SSL received a record with an incorrect Message Authentication Code.

Error code: SSL_ERROR_BAD_MAC_READ

Answer 1

Many Thanks to @steffen-ullrich, This is final solution for who comes later. works for http/https:

package main

import (
    "fmt"
    "net"
    "strings"
)

func main() {
    fmt.Println("Start server...")

    ln, _ := net.Listen("tcp", ":8000")

    for {
        conn, _ := ln.Accept()
        handleSocket(conn)
    }
}

func handleSocket(client_to_proxy net.Conn) {
    buffer := make([]byte, 32*1024)
    _, e := client_to_proxy.Read(buffer)
    if e != nil {
        fmt.Println("ERROR1 ", e)
        return
    }
    message := string(buffer)
    a := strings.Count(message, "\r\n")
    fmt.Println(message)
    fmt.Println(a)
    if e != nil {
        fmt.Println("ERROR1 ", e)
        return
    }

    splited := strings.Split(message, " ")
    //host := strings.Split(splited[1], ":")
    if splited[0] == "CONNECT" {
        //message = strings.Replace(message, "CONNECT", "GET", 1)
        proxy_to_server, e := net.Dial("tcp", splited[1])
        if e != nil {
            fmt.Println("ERROR2 ", e)
            return
        }
        //_, e = proxy_to_server.Write([]byte(message))
        //if e != nil {
        //  fmt.Println("ERROR2 ", e)
        //  return
        //}
        lenn, e := client_to_proxy.Write([]byte("HTTP/1.1 200 OK\r\n\r\n"))
        if e != nil {
            fmt.Println("ERROR8 ", e)
            return
        }
        fmt.Println(lenn)

        read443(client_to_proxy, proxy_to_server)
    } else if splited[0] == "GET" {
        host1 := strings.Replace(splited[1], "http://", "", 1)
        host2 := host1[:len(host1)-1]
        var final_host string
        if strings.LastIndexAny(host2, "/") > 0 {
            final_host = host2[:strings.LastIndexAny(host2, "/")]
        } else {
            final_host = host2
        }
        proxy_to_server, e := net.Dial("tcp", final_host+":80")
        if e != nil {
            fmt.Println("ERROR7 ", e)
            return
        }
        _, e = proxy_to_server.Write([]byte(message))
        if e != nil {
            fmt.Println("ERROR6 ", e)
            return
        }

        write80(client_to_proxy, proxy_to_server)
    }
}

func write80(client_to_proxy net.Conn, proxy_to_server net.Conn) {
    buffer := make([]byte, 64*1024)

    readLeng, err := proxy_to_server.Read(buffer)
    if err != nil {
        fmt.Println("ERROR9 ", err)
        return
    }
    fmt.Println("WRIIIIIIIIIIIIIIIIIIIIIIT from server:")
    fmt.Println(string(buffer[:readLeng]))
    if readLeng > 0 {
        _, err := client_to_proxy.Write(buffer[:readLeng])
        if err != nil {
            fmt.Println("ERR4 ", err)
            return
        }
    }

    go read80(client_to_proxy, proxy_to_server)
    for {
        readLeng, err := proxy_to_server.Read(buffer)
        if err != nil {
            fmt.Println("ERROR10 ", err)
            return
        }
        fmt.Println("WRIIIIIIIIIIIIIIIIIIIIIIT from server:")
        fmt.Println(string(buffer[:readLeng]))
        if readLeng > 0 {
            _, err := client_to_proxy.Write(buffer[:readLeng])
            if err != nil {
                fmt.Println("ERR4 ", err)
                return
            }
        }
    }
}

func read80(client_to_proxy net.Conn, proxy_to_server net.Conn) {
    buffer := make([]byte, 32*1024)

    for {
        readLeng, err := client_to_proxy.Read(buffer)
        if err != nil {
            return
        }
        fmt.Println("REEEEEEEEEEEEEEEEEEEEEEED from client:")
        fmt.Println(string(buffer[:readLeng]))
        if readLeng > 0 {
            _, err := proxy_to_server.Write(buffer[:readLeng])
            if err != nil {
                fmt.Println("ERR5 ", err)
                return
            }
        }
    }
}

func write443(client_to_proxy net.Conn, proxy_to_server net.Conn) {
    buffer := make([]byte, 32*1024)
    for {
        readLeng, err := proxy_to_server.Read(buffer)
        if err != nil {
            fmt.Println("ERROR10 ", err)
            return
        }
        fmt.Println("WRIIIIIIIIIIIIIIIIIIIIIIT from server:")
        fmt.Println(string(buffer[:readLeng]))
        if readLeng > 0 {
            _, err := client_to_proxy.Write(buffer[:readLeng])
            if err != nil {
                fmt.Println("ERR4 ", err)
                return
            }
        }
    }
}

func read443(client_to_proxy net.Conn, proxy_to_server net.Conn) {
    buffer := make([]byte, 32*1024)

    readLeng, err := client_to_proxy.Read(buffer)
    if err != nil {
        return
    }
    fmt.Println("REEEEEEEEEEEEEEEEEEEEEEED from client:")
    fmt.Println(string(buffer[:readLeng]))
    if readLeng > 0 {
        _, err := proxy_to_server.Write(buffer[:readLeng])
        if err != nil {
            fmt.Println("ERR5 ", err)
            return
        }
    }

    go write443(client_to_proxy, proxy_to_server)

    for {
        readLeng, err := client_to_proxy.Read(buffer)
        if err != nil {
            return
        }
        fmt.Println("REEEEEEEEEEEEEEEEEEEEEEED from client:")
        fmt.Println(string(buffer[:readLeng]))
        if readLeng > 0 {
            _, err := proxy_to_server.Write(buffer[:readLeng])
            if err != nil {
                fmt.Println("ERR5 ", err)
                return
            }
        }
    }
}