找出 HttpClient 超时的系统默认值

Question

如何找出 HttpClient 4.3 的实际超时值？我知道如何显式设置它们，但如果我不覆盖它们，我想知道隐式使用了哪些值。

示例

import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpRequestRetryHandler;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.params.HttpParams;

public class HttpClientDefaults
{

    public static void main(String[] args)
    {       
        RequestConfig config = RequestConfig.custom().build();
        System.out.println("ConnectionRequestTimeout: " + config.getConnectionRequestTimeout());
        System.out.println("ConnectTimeout: " + config.getConnectTimeout());
        System.out.println("SocketTimeout: " + config.getSocketTimeout());
        CloseableHttpClient client = HttpClientBuilder.create().setRetryHandler(new DefaultHttpRequestRetryHandler()).build();
        HttpParams params = client.getParams();
        System.out.println(params.getParameter("http.socket.timeout"));
    }

}

输出

ConnectionRequestTimeout: -1
ConnectTimeout: -1
SocketTimeout: -1
Exception in thread "main" java.lang.UnsupportedOperationException

client.getParams() 抛出 java.lang.UnsupportedOperationException 异常。有人知道读出将要使用的实际值的方法吗？

Answer 1

套接字、连接和连接请求超时的默认值为 0（无超时）