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v4/v6 Domain Name Conversion. This method, originallyproposed in [23], is similar to the technique used to providevirtual hosting service in HTTP 1.1, which makes it possible to support multiple websites on the same web server, sharing thesame IPv4 address, by exploiting the information contained inthe HTTP Host header to identify the specific web site requestedby the user. Similarly, it is possible to program the DNS servers insuch a way that, upon a DNS request for the domain name of anIoT web service, the DNS returns the IPv4 address of an HTTPCoAPcross proxy to be contacted to access the IoT node. Onceaddressed by an HTTP request, the proxy requires the resolutionof the domain name contained in the HTTP Host header to theIPv6 DNS server, which replies with the IPv6 address thatidentifies the final IoT node involved in the request. The proxycan then forward the HTTP message to the intended IoT viaCoAP.
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