httpclient org.apache.http.NoHttpResponseException: host:端口 failed to respond 错误原因和解决方法
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2022-04-29 17:23:02
failed to respond 的原因是因为:Http 的 KeepAlive参数引起。具体可以参考:https://blog.csdn.net/qq826654664jx/article/details/100864080解决思路:http连接不允许复用;解决代码:package com.phkj.equipment.util;import com.aliyun.oss.common.utils.HttpUtil;import org.apache.http.Const......
failed to respond 的原因是因为:
httpclient 之前与服务端建立的链接已经失效(例如:tomcat 默认的keep-alive timeout :20s),再次从连接池拿该失效链接进行请求时,就会报错。
具体可以参考:https://blog.csdn.net/xiaoduanayu/article/details/78386508
解决思路:http连接不允许复用;
解决代码:
httpPost.setHeader("Connection", "close");
package com.phkj.equipment.util;
import com.aliyun.oss.common.utils.HttpUtil;
import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.SocketTimeoutException;
public class HttpClientUtils {
private static final Logger log = LoggerFactory.getLogger(HttpUtil.class);
private static final CloseableHttpClient httpclient = HttpClients.createMinimal();
private static final String userAgent = "Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.87 Safari/537.36";
/**
* 发送HttpPost请求,参数为json字符串 * * @param url * @param jsonStr * @return
*/
public static String sendPost(String url, String jsonStr, int requestTimeout, int socketTimeout, int connectTimeout) throws ConnectTimeoutException, SocketTimeoutException, IOException, Exception {
if (requestTimeout == 0)
requestTimeout = 3000;
if (socketTimeout == 0)
requestTimeout = 3000;
if (connectTimeout == 0)
connectTimeout = 3000;
String result = null;
// 字符串编码
StringEntity entity = new StringEntity(jsonStr, Consts.UTF_8);
// 设置content-type
entity.setContentType("application/json");
HttpPost httpPost = new HttpPost(url);
//设置请求查实3秒
RequestConfig requestConfig = RequestConfig.custom().setConnectionRequestTimeout(requestTimeout).setSocketTimeout(socketTimeout).setConnectTimeout(connectTimeout).build();
httpPost.setConfig(requestConfig);
// 防止被当成攻击添加的
httpPost.setHeader("User-Agent", userAgent);
//设置不使用长连接
httpPost.setHeader("Connection", "close");
// 接收参数设置
httpPost.setHeader("Accept", "application/json");
httpPost.setEntity(entity);
CloseableHttpResponse response = null;
try {
response = httpclient.execute(httpPost);
HttpEntity httpEntity = response.getEntity();
result = EntityUtils.toString(httpEntity, "utf-8");
} catch (ConnectTimeoutException ex) {
throw ex;
} catch (SocketTimeoutException e) {
throw e;
} catch (IOException e) {
throw e;
} catch (Exception e) {
throw e;
} finally {
// 关闭CloseableHttpResponse
if (response != null) {
try {
response.close();
} catch (IOException e) {
log.error(e.getMessage());
}
}
}
return result;
}
}
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