add localhost to facebook app domain
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In networking localhost is a hostname that is used to refer to
this computer or the local machine. It is a loopback interface that is usually mapped to the IPv4 address 127.0.0.1, but any IP address from subnet 127.0.0.0/8 could be used for this purpose, although not all addresses are supported by all operating systems. In IPv6 networking localhost resolves to the address ::1.
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See what a domain name looks like, domain format, and popular extensions.
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