如何修复java.io.IOException:无法通过代理进行隧道。“代理申报表”；HTTP/1.1 400错误请求“；？

调用HttpURLConnection.getOutputStream（）时，我得到以下IOException：

无法通过代理进行隧道传输。代理返回“HTTP/1.1 400错误请求”

代码片段：

public static void main(String[] args) throws MalformedURLException, IOException {
        HttpURLConnection conn = (HttpURLConnection) new URL("https://example.com")
                .openConnection(new Proxy(Proxy.Type.HTTP, new InetSocketAddress("88.198.50.103", 3128)));
        conn.setDoOutput(true);

        try (OutputStream os = conn.getOutputStream(); OutputStreamWriter osw = new OutputStreamWriter(os)) {
            osw.write("Hello");
            osw.flush();
        } catch (IOException e) {
            System.err.println("Caught exception while opening outputstream.");
            e.printStackTrace();
        }
        System.out.println("Response: " + conn.getResponseMessage());
    }

Caught exception while opening outputstream.
java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 400 Bad Request"
    at sun.net.www.protocol.http.HttpURLConnection.doTunneling(Unknown Source)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(Unknown Source)
    at application.Main.main(Main.java:31)
Response: Bad Request

生产输出：

public static void main(String[] args) throws MalformedURLException, IOException {
        HttpURLConnection conn = (HttpURLConnection) new URL("https://example.com")
                .openConnection(new Proxy(Proxy.Type.HTTP, new InetSocketAddress("88.198.50.103", 3128)));
        conn.setDoOutput(true);

        try (OutputStream os = conn.getOutputStream(); OutputStreamWriter osw = new OutputStreamWriter(os)) {
            osw.write("Hello");
            osw.flush();
        } catch (IOException e) {
            System.err.println("Caught exception while opening outputstream.");
            e.printStackTrace();
        }
        System.out.println("Response: " + conn.getResponseMessage());
    }

Caught exception while opening outputstream.
java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 400 Bad Request"
    at sun.net.www.protocol.http.HttpURLConnection.doTunneling(Unknown Source)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(Unknown Source)
    at application.Main.main(Main.java:31)
Response: Bad Request

我尝试了在互联网上找到的随机免费代理，所有代理都有相同的输出

这和我的电脑有关吗？或者我使用代理的代码是错误的

SocketAddress addr = new InetSocketAddress("104.248.63.17",30588);
    Proxy proxy = new Proxy(Proxy.Type.SOCKS, addr);
    URL url = new URL("https://www.proxy-listen.de/Proxy/Proxyliste.html");
    URLConnection   conn = url.openConnection(proxy);
    //follow code reads html from url 
    BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String inputLine;
    while ((inputLine = in.readLine()) != null)
        System.out.println(inputLine);
    in.close();

这个代码对我有用。我搜索了一个socks5代理，然后它可以与类型socks一起工作

这个代码对我有用。我搜索了一个socks5代理，然后它可以与类型socks一起工作