Nginx Force (Redirect) WWW.Domain.COM To Domain.COM

To force (redirect) www.domain.com to domain.com in Nginx, you can use the server_name directive and the return directive in the server block for your site. Here's an example of how you can set this up:

server {
    listen 80;
    server_name www.domain.com;
    return 301 $scheme://domain.com$request_uri;
}

server {
    listen 80;
    server_name domain.com;

    # Your other server block directives go here
}

In this example, the first server block listens for requests to www.domain.com and returns a 301 redirect to domain.com, using the $scheme and $request_uri variables to preserve the protocol (http or https) and the requested URL path. The second server block listens for requests to domain.com and contains your other server block directives.

You can also use the rewrite directive instead of the return directive to accomplish the same thing:

server {
    listen 80;
    server_name www.domain.com;
    rewrite ^ http://domain.com$request_uri permanent;
}

server {
    listen 80;
    server_name domain.com;

    # Your other server block directives go here
}

The rewrite directive in this example uses a regular expression to match all requests to www.domain.com, and returns a permanent (301) redirect to domain.com, using the $request_uri variable to preserve the requested URL path.

For more information on the server_name directive and the return or rewrite directives, you can refer to the Nginx documentation.