配置httpclient（HTTP协议的客户端编程工具包）

<properties>
    <httpclient.version>4.3.5</httpclient.version>
</properties>

<dependencyManagement>
    <dependencies>
        <!-- httpclient -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>${httpclient.version}</version>
        </dependency>
    </dependencies>
</dependencyManagement>