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| <p>使用 HTTPService 时，LiveCycle Data Services ES 或 BlazeDS 服务器不是必需的。默认情况下，应用程序会尝试直接连接在 HTTPService url 属性中指定的域。这种情况发生的前提是要满足以下两个条件之一：</p>
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| <li>在 HTTPService url 属性中指定的域是下载应用程序的域。 </li>
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| <li>在 HTTPService url 属性中指定的域中，可以使用授权访问应用程序来源域的 crossdomain.xml 文件。</li>
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| <p>如果希望应用程序访问其它域中提供的服务，而该域中并没有部署 crossdomain.xml 文件（例如，由于您并不拥有该目标域），则可以将 HTTPService 的 <strong>useProxy</strong> 属性设置为“<strong>true</strong>”，如本示例中所示。在本例中，将请求发送到 LiveCycle Data Services ES 代理，该代理代表客户端应用程序向目标域发出请求。对于对服务的访问，该配置还提供更多控制。例如，可以对代理进行配置，要求在访问服务之前进行身份验证、记录对服务的访问等等。 </p>
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| <p>使用代理时，可以在 HTTPService <strong>destination</strong> 属性中指定逻辑名称，而不用在 url 属性中指定硬编码的值。然后在 WEB-INF/flex/proxy-config.xml 中将该逻辑名称映射为实际 URL。打开 WEB-INF/flex/proxy-config.xml 可查看目录目标的配置情况。</p>
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