HttpClientError:目标服务器无法响应

Question

我正在尝试使用http客户端使用PoolingClientConnectionManager为各个主机设置最大连接来命中服务器

 //Code that inilizes my connection mananger and http client 

HttpParams httpParam = httpclient.getParams(); HttpConnectionParams.setSoTimeout(httpParam,SOCKET_TIMEOUT);

    HttpConnectionParams.setConnectionTimeout(httpParam, CONN_TIMEOUT);

    httpclient.setParams(httpParam);

    //Run a thread which closes Expired connections
    new ConnectionManager(connManager).start(); 

        //Code that executes my request 
    HttpPost httpPost = new HttpPost(url);
            HttpEntity httpEntity = new StringEntity(request, "UTF-8");
    httpPost.setEntity(httpEntity);

    Header acceptEncoding = new BasicHeader("Accept-Encoding", "gzip,deflate");
    httpPost.setHeader(acceptEncoding);     

    if(contenttype != null && !contenttype.equals("")){
        Header contentType = new BasicHeader("Content-Type", contenttype);
        httpPost.setHeader(contentType);
    }
            InputStream inputStream = null;
    LOG.info(dataSource + URL + url + REQUEST + request);

    HttpResponse response = httpclient.execute(httpPost);

那就是我们使用连接池来实现http持久性.

我们偶尔会收到此错误:

The target server failed to respond
org.apache.http.NoHttpResponseException: The target server failed to respond
        at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:95)
        at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:62)
        at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:254)
        at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:289)
        at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:252)
        at org.apache.http.impl.conn.ManagedClientConnectionImpl.receiveResponseHeader(ManagedClientConnectionImpl.java:191)
        at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:300)
        at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:127)
        at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:517)
        at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)

有谁知道如何解决这个问题？

我们也在关闭空闲连接.

有人可以帮忙.

http://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html

Answer 1

可能是HttpClient中的一个错误.

如果您使用的是HttpClient 4.4,请尝试升级到4.4.1.

如果您想了解更多信息,请查看此链接.

如果您无法升级,以下链接可能会有所帮助.

http://www.nuxeo.com/blog/using-httpclient-properly-avoid-closewait-tcp-connections/

祝好运!

Answer 2

最近在使用HttpClient 5.

在启用HttpClient日志并发现问题是由于陈旧的连接。

添加以下内容有助于解决该问题，它会检测并验证在重用之前在池中保持不活动状态时已失效的连接。

PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();

connectionManager.setValidateAfterInactivity(timeinmilliseconds);