NGINX study notes - passing request headers

Original address: https://www.nginx.com/resources/admin-guide/reverse-proxy/
Original title: Passing Request Headers

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By default, NGINX will redefine two HTTP header fields, "Host" and "Connection" when proxying a request, and delete the header fields with empty values. "Host" will be set to the value of the $proxy_host variable, and "Connection" will be set to close.
By default, NGINX redefines two header fields in proxied requests, “Host” and “Connection”, and eliminates the header fields whose values ​​are empty strings. “Host” is set to the $proxy_host variable, and “Connection” is set to close .

To change these settings, including modifying other header fields, use the proxy_set_header command. This directive can be used in location or higher. Can also be in a specific server context or in an http block, for example:
To change these setting, as well as modify other header fields, use the proxy_set_header directive. This directive can be specified in a location or higher. It can also be specified in a particular server context or in the http block. For example:

<code>location /some/path<span>/</span> {
    proxy_set_header Host <span>$host</span>;
    proxy_set_header X<span>-Real</span><span>-IP</span><span>$remote_addr</span>;
    proxy_pass http:<span>//localhost:8000;</span>
}</code>

In this configuration, the "Host" field is set to the $host variable.
In this configuration the “Host” field is set to the $host variable. To prevent a header field from being passed to the proxied server, just set it to the empty string.

To prevent a header field from being passed to the proxied server, set it to an empty string as follows:

<code>location /some/path<span>/</span> {
    proxy_set_header Accept<span>-Encoding</span><span>""</span>;
    proxy_pass http:<span>//localhost:8000;</span>
}</code>

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