如何从okhttp3.ResponseBody获取url？

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;
import okio.BufferedSource;

import java.io.IOException;

public class Main {
    public static void main(String[] args) {
        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url("https://www.example.com")
                .build();

        try {
            Response response = client.newCall(request).execute();
            ResponseBody responseBody = response.body();

            if (responseBody != null) {
                BufferedSource source = responseBody.source();
                String firstLine = source.readUtf8Line();

                // 提取URL
                String url = extractUrlFromFirstLine(firstLine);
                System.out.println("URL: " + url);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static String extractUrlFromFirstLine(String firstLine) {
        // 在第一行数据中提取URL
        // 这里的提取方式可能因具体响应格式而有所不同
        // 示例中假设第一行数据为 "HTTP/1.1 200 OK"
        // 实际应根据具体情况进行解析
        String[] parts = firstLine.split(" ");
        if (parts.length >= 2) {
            return parts[1];
        } else {
            return "";
        }
    }
}