If a matching response is found, it is delivered as the response.
如果找到匹配响应，会将其作为响应交付。
For each portlet request, the portal searches its portlet cache for a matching response.
对于每个Portlet请求，门户将搜索其Portlet缓存以查找匹配响应。
If no matching response can be found, the request is forwarded to the requested origin server.
如果没找到匹配请求，则将请求转发到所请求的原始服务器。
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