揭秘浏览器键入URI到页面显示的过程: 浏览器键入URI，到页面显示，中间发生什么？

package main
import (
  "fmt"
  "net"
  "net/http"
  "time"
)
func main() {
  // 用户输入的URI
  uri := "https://www.example.com"
  // 解析URI获取主机名和端口
  host, port, err := net.SplitHostPort(uri)
  if err != nil {
    fmt.Println("Error:", err)
    return
  }
  // 建立TCP连接
  conn, err := net.DialTimeout("tcp", net.JoinHostPort(host, port), 5*time.Second)
  if err != nil {
    fmt.Println("Error:", err)
    return
  }
  defer conn.Close()
  // 发起HTTP请求
  request, err := http.NewRequest("GET", uri, nil)
  if err != nil {
    fmt.Println("Error:", err)
    return
  }
  client := &http.Client{}
  response, err := client.Do(request)
  if err != nil {
    fmt.Println("Error:", err)
    return
  }
  defer response.Body.Close()
  // 读取和处理响应数据
  // 这里可以根据实际需要对响应数据进行处理，比如解析HTML内容等
  // ...
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
public class Main {
    public static void main(String[] args) throws IOException {
        // 用户输入的URI
        String uri = "https://www.example.com";
        // 创建URL对象
        URL url = new URL(uri);
        // 打开HTTP连接
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        // 配置连接属性
        connection.setRequestMethod("GET");
        connection.setConnectTimeout(5000);
        connection.setReadTimeout(5000);
        // 发起请求
        int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            StringBuilder content = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                content.append(line);
            }
            reader.close();
            // 处理响应数据
            // 这里可以根据实际需要对响应数据进行处理，比如解析HTML内容等
            // ...
        } else {
            System.out.println("HTTP Request failed with response code: " + responseCode);
        }
    }
}

import socket
import ssl
import requests
def main():
    # 用户输入的URI
    uri = "https://www.example.com"
    # 解析URI获取主机名和路径
    parsed_uri = requests.utils.urlparse(uri)
    host = parsed_uri.netloc
    path = parsed_uri.path if parsed_uri.path else "/"
    # 建立TCP连接并进行SSL握手
    context = ssl.create_default_context()
    with socket.create_connection((host, 443)) as sock:
        with context.wrap_socket(sock, server_hostname=host) as ssock:
            request = f"GET {path} HTTP/1.1\r\nHost: {host}\r\n\r\n"
            ssock.sendall(request.encode())
            response = ssock.recv(4096)
            response = response.decode("utf-8")
            # 处理响应数据
            # 这里可以根据实际需要对响应数据进行处理，比如解析HTML内容等
            # ...
if __name__ == "__main__":
    main()