要解决Apache Http客户端在发送HTTPS请求后发送FIN的问题，您可以尝试以下代码示例：

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContextBuilder;

import javax.net.ssl.SSLContext;
import java.io.IOException;

public class HttpClientExample {
    public static void main(String[] args) {
        try {
            // 创建自定义SSL上下文，忽略主机名验证
            SSLContext sslContext = SSLContextBuilder.create()
                    .loadTrustMaterial((chain, authType) -> true)
                    .build();

            // 创建自定义SSL连接套接字工厂
            SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContext, NoopHostnameVerifier.INSTANCE);

            // 创建HttpClient实例
            CloseableHttpClient httpClient = HttpClients.custom()
                    .setSSLSocketFactory(sslSocketFactory)
                    .build();

            // 创建HTTP GET请求
            HttpGet httpGet = new HttpGet("https://example.com");

            // 发送请求
            CloseableHttpResponse response = httpClient.execute(httpGet);

            // 处理响应
            try {
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    // 处理响应内容
                    System.out.println(entity.getContent());
                }
            } finally {
                response.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

上述代码示例使用自定义的SSL上下文和连接套接字工厂来忽略主机名验证。这样可以解决发送HTTPS请求后发送FIN的问题。请注意，这只是一种解决方法，具体解决方法可能因您的环境和需求而异。