如何在post请求中正确传递西里尔字母？Groovy

@Grab('org.apache.httpcomponents:httpclient:4.5.13')

import org.apache.http.HttpEntity
import org.apache.http.client.methods.HttpPost
import org.apache.http.entity.StringEntity
import org.apache.http.impl.client.CloseableHttpClient
import org.apache.http.impl.client.HttpClients

def sendPostRequest(String url, Map<String, String> params) {
    CloseableHttpClient httpClient = HttpClients.createDefault()
    HttpPost httpPost = new HttpPost(url)
    
    // 设置请求头部
    httpPost.setHeader('Content-Type', 'application/x-www-form-urlencoded;charset=UTF-8')
    
    // 构建请求体
    def encodedParams = params.collect { k, v -> "${URLEncoder.encode(k, 'UTF-8')}=${URLEncoder.encode(v, 'UTF-8')}" }.join('&')
    HttpEntity entity = new StringEntity(encodedParams)
    httpPost.setEntity(entity)
    
    // 发送请求
    def response = httpClient.execute(httpPost)
    
    // 处理响应
    // ...
}

// 示例用法
def url = 'https://example.com/api'
def params = [
    'name': 'Иван',
    'age': '30'
]

sendPostRequest(url, params)