如何计算出java REST调用所需的标头？

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class RestHeaderCalculator {
    public static void main(String[] args) {
        String username = "your_username";
        String password = "your_password";
        
        // 计算基本认证的标头
        String basicAuthHeader = calculateBasicAuthHeader(username, password);
        System.out.println("Basic Auth Header: " + basicAuthHeader);
        
        // 计算自定义标头
        String customHeader = calculateCustomHeader();
        System.out.println("Custom Header: " + customHeader);
    }
    
    // 计算基本认证的标头
    private static String calculateBasicAuthHeader(String username, String password) {
        String credentials = username + ":" + password;
        String encodedCredentials = Base64.getEncoder().encodeToString(credentials.getBytes(StandardCharsets.UTF_8));
        return "Basic " + encodedCredentials;
    }
    
    // 计算自定义标头
    private static String calculateCustomHeader() {
        // 根据具体需求进行计算
        return "Custom-Header: value";
    }
}