HttpClientError: The target server failed to respond

Question

我正在尝试通过 PoolingClientConnectionManager 为单个主机设置最大连接数来使用 HTTP 客户端访问服务器

//Code that initializes my connection manager 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);

也就是说，我们正在使用连接池来实现 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)

有人知道如何解决这个问题吗？

我们也正在关闭空闲连接。

可以请一些帮助。

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

Answer 1

可能是 HttpClient 中的错误。

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this link。

如果您无法升级，以下链接可能会有帮助。

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

祝你好运！

Answer 2

最近在使用 HttpClient 5 时遇到类似问题。

在启用 HttpClient 日志时发现问题是由于连接失效造成的。

添加以下内容有助于解决问题，它会检测并验证已变得陈旧但在重用之前在池中保持非活动状态的连接。

PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();

connectionManager.setValidateAfterInactivity(timeinmilliseconds);

HttpClientError: The target server failed to respond

HttpClientError: The target server failed to respond

java

apache

connection-pooling

httpclient