Pingback: Check out the specification of the pingback protocol for notifying Web authors of links to their documents.
Pingback：阅读 pingback协议的规范，该协议用于通知Web作者指向他们文档的链接。
Pingback: Check out the specification of the pingback protocol for notifying Web authors of links to their documents.
Pingback：阅读 pingback协议的规范，该协议用于通知Web作者指向他们文档的链接。
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