Reverse Proxy - NGINX Reverse Proxy - Passing Request Headers

By default, NGINX modifies two header fields in proxied requests, “Host” and “Connection”, and eliminates the header fields whose values are empty strings.

“Host” is set to the value of the $proxy_host variable, and
“Connection” is set to close.

To change these settings, 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:

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

NOTE: In this configuration the “Host” field is set to the $host variable.

To prevent a header field from being passed to the proxied server

Set it to an empty string as follows:

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