java - 连接 URL 时出现问题

Question

这就是请求的样子(在顶部):

这是我的 Java 代码:

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class Main {

public static void main(String[] args) throws Exception{
    URL url = new URL("http://ishin-global.aktsk.com");
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    conn.setDoOutput(true);

    conn.setRequestMethod("GET");
    conn.setRequestProperty("/ping ", " HTTP/1.1");
    conn.setRequestProperty("Host"," ishin-global.aktsk.com");
    conn.setRequestProperty("Accept"," */*");
    conn.setRequestProperty("X-Platform"," android");
    conn.setRequestProperty("X-ClientVersion"," 3.1.2");
    conn.setRequestProperty("X-Language"," en");
    conn.connect();

    String line;
    BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    while ((line = reader.readLine()) != null) {
      System.out.println(line);
    }
    reader.close();
}

问题是我没有从服务器得到响应，但我收到这些错误:

Exception in thread "main" java.io.FileNotFoundException: http://ishin-global.aktsk.com
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1836)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
at Main.main(Main.java:24)

我一直无法弄清楚，所以我在这里问。提前谢谢

Answer 1

conn.setRequestProperty("/ping ", "HTTP/1.1"); 不正确。 /ping 不是 HTTP 请求 header ，而是 URL 的路径。 URL 的路径是 URL 本身的一部分，而不是 header :

URL url = new URL("http://ishin-global.aktsk.com/ping");

删除 conn.setRequestProperty("/ping ", "HTTP/1.1"); 行。 Java(以及每个 HTTP 客户端)在连接时将自动发送正确的初始行。