HttpClient 并发报 Timeout waiting for connection from pool

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新建了一个 HttpClient 实例，使用 for 循环调用，结果报出以下错误

java org.apache.http.conn.ConnectionPoolTimeoutException: Timeout waiting for connection from pool

解决方法，修改连接池配置，增大连接数

RequestConfig config = RequestConfig.custom()  
    .setSocketTimeout(socketTimeout)  
    .setConnectTimeout(connectTimeout)  
    .setConnectionRequestTimeout(connectionRequestTimeout).build();  
httpClient = HttpClients.custom().setDefaultRequestConfig(config)  
     .setMaxConnTotal(maxConnTotal)  
     .setMaxConnPerRoute(maxConnPerRoute).build();

参考资料