> Is there a way to prevent Arbitrary HTTP Host header in Nginx? Penetration 
> test has reported accepting arbitrary host headers. Thanks in Advance and I 
> look forward to hearing from you.

You can always define "catch all" server block with:

server {
    listen       80  default_server;
    server_name  _;
    return       444;
}

(444 is connection close without response)

And then just add valid host names to the other server blocks.

rr

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