org.apache.http.NoHttpResponseException: failed to respond 问题解决

前几天在项目联调中遇到接口报错org.apache.http.NoHttpResponseException:  failed to respond 。用postMan 等工具测试接口都正常，但是在应用中，就是报该错误，困扰了几天。后经过分析，我们应用中先调用了一个查询接口，紧接着又调用了其它接口，使用HttpClientUtils工具实现Http接口调用，用了HTTP链接池。由于对方提供的接口未使用HTTP连接池，导致我们还使用同一个Http链接，而对方已经断开了HTTP链接。网上找了很多资料，要求tomcat配置文件修改如下：

               connectionTimeout="20000"
               keepAliveTimeout="10000"
               redirectPort="8443" />

增加 keepAliveTimeout="10000"。但是我们不是接口服务提供方，但这个配置给了指引，需修改HttpClient

增加策略KeepAliveStrategy

//DefaultConnectionKeepAliveStrategy 默认实现
ConnectionKeepAliveStrategy myStrategy = new ConnectionKeepAliveStrategy() {
    @Override
    public long getKeepAliveDuration(HttpResponse response, HttpContext context) {
        Args.notNull(response, "HTTP response");
        final HeaderElementIterator it = new BasicHeaderElementIterator(
                response.headerIterator(HTTP.CONN_KEEP_ALIVE));
        while (it.hasNext()) {
            final HeaderElement he = it.nextElement();
            final String param = he.getName();
            final String value = he.getValue();
            if (value != null && param.equalsIgnoreCase("timeout")) {
                try {
                    return Long.parseLong(value) * 1000;
                } catch (final NumberFormatException ignore) {
                }
            }
        }
        return 1;
    }

};

final CloseableHttpClient httpclient = HttpClients.custom().setConnectionManagerShared(true)
        .setConnectionManager(POOL)
        .setKeepAliveStrategy(myStrategy)
        .evictExpiredConnections()
        .build();

org.apache.http.NoHttpResponseException: X.X.X.X:8080 failed to respond
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:143)
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:57)
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:261)
at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:165)
at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:167)
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:272)
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:124)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:271)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)