有没有办法从Java servlet处理程序获取原始http请求流？

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/RawRequestServlet")
public class RawRequestServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // 获取原始请求流
        BufferedReader reader = new BufferedReader(new InputStreamReader(request.getInputStream()));
        String line;
        StringBuilder sb = new StringBuilder();
        while ((line = reader.readLine()) != null) {
            sb.append(line);
        }
        reader.close();
        String rawRequest = sb.toString();

        // 处理原始请求流
        // ...

        // 返回响应
        response.getWriter().println("Raw request: " + rawRequest);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }
}