试试这个

if ($host !~* ^www\.){
    rewrite ^(.*)$ https://www.yoursite.example$1;
}

其他方式: Nginx no-www to www

server {
  listen       80;
  server_name  yoursite.example;
  root /path/;
  index index.php;
  return       301 https://www.yoursite.example$request_uri;
}

WWW到no-www

server {
  listen       80;
  server_name  www.yoursite.example;
  root /path/;
  index index.php;
  return       301 https://yoursite.example$request_uri;
}

我结合了所有简单答案中最好的，没有硬编码的域。

301永久重定向从非www到www (HTTP或HTTPS):

server {
    if ($host !~ ^www\.) {
        rewrite ^ $scheme://www.$host$request_uri permanent;
    }

    # Regular location configs...
}

如果你更喜欢非HTTPS、非www而不是HTTPS, www同时重定向:

server {
    listen 80;

    if ($host !~ ^www\.) {
        rewrite ^ https://www.$host$request_uri permanent;
    }

    rewrite ^ https://$host$request_uri permanent;
}

实际上你甚至不需要重写。

server {
    #listen 80 is default
    server_name www.example.com;
    return 301 $scheme://example.com$request_uri;
}

server {
    #listen 80 is default
    server_name example.com;
    ## here goes the rest of your conf...
}

因为我的答案得到越来越多的支持，但上面也一样。永远不要在这种情况下使用重写。为什么?因为nginx必须处理并开始搜索。如果你使用return(应该在任何nginx版本中都可用)，它会直接停止执行。这在任何上下文中都是首选。

将非SSL和SSL都重定向到它们的非www对应对象:

server {
    listen               80;
    listen               443 ssl;
    server_name          www.example.com;
    ssl_certificate      path/to/cert;
    ssl_certificate_key  path/to/key;

    return 301 $scheme://example.com$request_uri;
}

server {
    listen               80;
    listen               443 ssl;
    server_name          example.com;
    ssl_certificate      path/to/cert;
    ssl_certificate_key  path/to/key;

    # rest goes here...
}

如果您的服务器只在端口80(默认)上监听，并且listen选项不包含ssl关键字，$scheme变量将只包含http。不使用该变量将不会为您带来任何性能。

注意，如果使用HSTS，则需要更多的服务器块，因为HSTS头不应该通过非加密连接发送。因此，您需要带重定向的未加密服务器块和带重定向和HSTS标头的加密服务器块。

重定向所有内容到SSL(个人配置UNIX与IPv4, IPv6, SPDY，…):

#
# Redirect all www to non-www
#
server {
    server_name          www.example.com;
    ssl_certificate      ssl/example.com/crt;
    ssl_certificate_key  ssl/example.com/key;
    listen               *:80;
    listen               *:443 ssl spdy;
    listen               [::]:80 ipv6only=on;
    listen               [::]:443 ssl spdy ipv6only=on;

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

#
# Redirect all non-encrypted to encrypted
#
server {
    server_name          example.com;
    listen               *:80;
    listen               [::]:80;

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

#
# There we go!
#
server {
    server_name          example.com;
    ssl_certificate      ssl/example.com/crt;
    ssl_certificate_key  ssl/example.com/key;
    listen               *:443 ssl spdy;
    listen               [::]:443 ssl spdy;

    # rest goes here...
}

我猜你们现在可以自己想象其他化合物的这种模式。

更多我的配置?去这里和这里。

我的配置是- Nginx + tomcat 9 + Ubuntu 20.04 + spring boot app 上面所有的答案都不适合我-也不适合Nginx文件中的上游符号-所以我改变了我的设置

感谢上帝的certbot -这个util非常有用，它为您的网站生成基本文件，然后我添加了我的更改-重定向https://www.example.com, http://www.example.com到只有一个https://example.com

server {
if ($host = www.example.com) {
    return 301 https://example.com$request_uri;
}
    root /var/www/example.com/html;
    index index.html index.htm index.nginx-debian.html;

    server_name example.com www.example.com;

    location / {
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header Host $http_host;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_pass http://127.0.0.1:8080; # This is upstream name, note the variable $scheme in it
      proxy_redirect off;
    }
listen [::]:443 ssl ipv6only=on; # managed by Certbot
listen 443 ssl; # managed by Certbot
ssl_certificate /etc/letsencrypt/live/www.example.com/fullchain.pem; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/www.example.com/privkey.pem; # managed by Certbot
include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}
server {
    if ($host = www.example.com) {
        return 301 https://example.com$request_uri;
    } # managed by Certbot
    if ($host = example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot
        listen 80;
        listen [::]:80;
        server_name example.com www.example.com;
    return 404; # managed by Certbot
}

下面是如何为多个www到no-www服务器名做这件事(我用这个子域名):

server {
        server_name 
             "~^www\.(sub1.example.com)$"
             "~^www\.(sub2.example.com)$"
             "~^www\.(sub3.example.com)$";
         return 301 $scheme://$1$request_uri ;
}

if ($host ~* ^www.example.com$) {
    return 301 $scheme://example.com$request_uri;
}