nginx empty host header

Host header

This concept comes from the windows IIS server; we can simply understand that a host header is a host;

nginx prohibits empty host header configuration

can distribute requests and reverse proxy based on domain name and location;
For example,

<code>server {
        listen <span>80</span>;
        server_name _;   <span>##标示空主机头</span>        location / {
                root html;
                <span>return</span><span>404</span>;
        }

        location ~ /.ht {
                deny <span>all</span>;
        }
    }</code>

this prohibits empty host header access;

nginx sets the domain name that can be forwarded

ss

<code>server {
        listen  <span>80</span><span>;</span>
        server_name www<span>.test</span><span>.com</span><span>;</span>        location / {
                root html<span>;</span>
                index index<span>.html</span> index<span>.htm</span><span>;</span>
        }
    }

    server {
        listen       <span>80</span><span>;</span>
        server_name  localhost<span>;</span><span>#charset koi8-r;</span><span>#access_log  logs/host.access.log  main;</span>        location / {
            root   html<span>;</span>
            index  index<span>.html</span> index<span>.htm</span><span>;</span>
        }

        <span>#error_page  404              /404.html;</span><span># redirect server error pages to the static page /50x.html</span><span>#</span>
        error_page   <span>500</span><span>502</span><span>503</span><span>504</span>  /<span>50</span><span>x</span><span>.html</span><span>;</span>
        location = /<span>50</span><span>x</span><span>.html</span> {
            root   html<span>;</span>
        }

        location ~ (favicon<span>.ico</span>) {
                 root html<span>;</span>
         }
    }</code>

Configure two virtual hosts on this machine, one is www.test.com and the other is localhost;

The host binding is (modify the /etc/hosts file):

<code><span>127.0</span><span>.0</span><span>.1</span>       localhost
<span>127.0</span><span>.0</span><span>.1</span>  www<span>.test</span><span>.com</span><span>127.0</span><span>.0</span><span>.1</span>  www<span>.test</span>1<span>.com</span></code>

can now be accessed through localhost and www.test.com, but access through www.test1.com is rejected and a 404 error is reported;

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The above introduces the nginx empty host header, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.