| 摘要 |
In one aspect, a method comprises: receiving, by a first processing system, information indicating that a second processing system has content that is to be provided to the first processing system; receiving, by the first processing system, content and at least one identifier from the second processing system; determining, by the first processing system and based at least in part on the at least one identifier, whether the content is another version of content previously received by the first processing system; receiving, by the first processing system, information indicating that a third processing system is to receive content from the first processing system; and transmitting, by the first processing system, the content, at least one identifier and version information to the third processing system, wherein the version information indicates whether the transmitted content is another version of content that has been previously transmitted by the first processing system to the third processing system.
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