I have a simple http/https proxy and trying to handle this headers. When i get Get header try to make tcp socket to that website. But this one has other data and different Host and Referer. How should I handle this header?

GET http://webcode.me/format.css HTTP/1.1
Host: webcode.meun, 23 Jan 2022 10:39:25 GMT��∟↔Y_=�>∟>ߞ����B�
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:106.0) Gecko/20100101 Firefox/106.0
Accept: text/css,*/*;q=0.1
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Connection: keep-alive
Referer: http://webcode.me/rom client: 282

And this is my code

func handleSocket(client_to_proxy net.Conn) {
    buffer := make([]byte, 8*1024)
    length, e := client_to_proxy.Read(buffer)
    if e != nil {
        fmt.Println("ERR1 ", e)
        return
    }
var host []string
    headers := strings.Split(message, "\r\n")
    for _, header := range headers {
        if strings.HasPrefix(header, "Host") {
            host = strings.Split(strings.Replace(header, " ", "", 1), ":")
            break
        }
    }

    splited := strings.Split(message, " ")
    if splited[0] == "CONNECT" {
        proxy_to_server, e := net.Dial("tcp", splited[1])
        if e != nil {
            fmt.Println("ERROR3 ", e)
            return
        }

        fmt.Println("CONNECTed TO: "   splited[1])

        _, e = client_to_proxy.Write([]byte("HTTP/1.1 200 Connection Established\r\n"))
        if e != nil {
            fmt.Println("ERROR4 ", e)
            return
        }

        read443(client_to_proxy, proxy_to_server)
    } else if splited[0] == "GET" {
        proxy_to_server, e := net.Dial("tcp", host[1] ":80")
        if e != nil {
            fmt.Println("ERROR5 ", e)
            return
        }
        _, e = proxy_to_server.Write([]byte(message))
        if e != nil {
            fmt.Println("ERROR6 ", e)
            return
        }

        write80(client_to_proxy, proxy_to_server)
    }
}

CodePudding user response：

Mistake 1)I used AES/ECB to encrypt data and data length must be multiple of key length. So i was adding some byte to fix it and didn't remove it after decryption.

Mistake 2) I used URL after GET and now use URL after host. Then send all received headers to host.

I still have problem in connecting some host using https but hope they will be fixed soon.