redirect_canon_url.conf

# Nginx で
# www.hogehoge.com -> hogehoge.com
# http://{www.}hogehoge.com -> https://hogehoge.com
# に一気に正規化する設定の例

# server コンテキスト

set $redirect_canon_url "";
set $canon_host $host;
if ( $host ~ ^www\.(.*)$ ) {
    set $canon_host $1;
}
if ( $scheme = "http" ) {
    set $redirect_canon_url "canon";
}
if ( $host ~ ^www\. ) {
    set $redirect_canon_url "canon";
}
if ( $redirect_canon_url = "canon" ) {
    return 301 https://$canon_host$request_uri;
}