其實很簡單:

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if?($server_port?!=?'80'?)?{
???rewrite?^/(.*)$?http://$host/$1?permanent;
}

舉一反三。。。

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if?($server_port?!=?'443'?)?{
???rewrite?^/(.*)$?https://$host/$1?permanent;
}
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if?($host?!=?'host'?)?{
???rewrite?^/(.*)$?http://host/$1?permanent;
}