Nginx: Redirect non-www to www https

by

Make one server block a default server and give the other server block the one true server_name.

server {
    listen  80 default_server;
    listen  443 ssl default_server;

    ssl_certificate ...;
    ssl_certificate_key ...;
    return  301 https://www.example.com$request_uri;
}

server {
    listen  443 ssl;
    server_name www.example.com;

    ssl_certificate ...;
    ssl_certificate_key ...;
    ...
}

The default server for https requires a valid certificate. Assuming you have a wildcard certificate – most of the ssl_ statements could be moved into the outer block and be inherited by both server blocks. For example:

ssl_certificate ...;
ssl_certificate_key ...;
ssl_...;

server {
    listen  80 default_server;
    listen  443 ssl default_server;
    return  301 https://www.example.com$request_uri;
}

server {
    listen  443 ssl;
    server_name www.example.com;
    ...
}

See this document for more.

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