| 摘要 |
A computer-implemented method including receiving, at a server, a first request for content; determining whether the content is available locally at the server; when the content is available locally at the server, retrieving the content locally at the server; and transmitting the content to at least one downstream server; and when the content is not available locally at the server, transmitting, to the at least one downstream server, a notification that the content is not available locally and that a second request for the content is being transmitted; and transmitting the second request for the content to at least one upstream server.
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