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In some cases, it is necessary to use the results of the query of domain B for the query of domain A, such as the optimization of the speed of some CDN. At this time, you can use the CNAME alias query function.
Use cname /a.com/b.com to configure the proxy server
cname /a.com/b.com
In the above example, when querying a.com, the query result of b.com will be used.