# Nginx Redirect

### http to https {#http-to-https}

```
    http {
      server {
        listen 443 ssl;
        server_name www.example.com;
        ssl_certificate /path/to/file;
        ssl_certificate_key /path/to/file;
        ...
      }
      server {
        listen 80;
        server_name www.example.com;
        rewrite ^(.*) https://$server_name$1 permanent;
      }
    }
```

### example.com to www.example.com {#example-dot-com-to-www-dot-example-dot-com}

```
    http {
      server {
        listen 80;
        server_name www.example.com example.com;
        return 301 https://www.example.com$request_uri;
    }
```

要记得为根域名添加 DNS 记录，如果不添加的话，怎么改 Nginx
的配置都是不行的。来自我亲身经历的教训：）

### `https://example.com` to `https://www.example.com` {#https-example-dot-com-to-https-www-dot-example-dot-com}

```
    http {
      server {
        listen 80;
        server_name www.example.com example.com;
        return 301 https://www.example.com$request_uri;
      }
      server {
        listen 443 ssl http2;
        server_name example.com;
        return 301 https://www.example.com$request_uri;
      }
      server {
        listen 443 ssl http2;
        server_name www.example.com;
        ssl_certificate /path/to/ssl.pem;
        ssl_certificate_key /path/to/ssl-key.pem;
        location / {
          root /home/www/public;
          index index.html;
        }
      }
    }
```

### Configure with Docker {#configure-with-docker}

用到了
[nginx-proxy](https://hub.docker.com/r/nginxproxy/nginx-proxy)。

nginx-proxy 的 docker-compose 文件：

```
    version: "3"

    services:
      nginx-proxy:
        image: nginxproxy/nginx-proxy:alpine
        container_name: nginx-proxy
        ports:
          - "80:80"
          - "443:443"
        volumes:
          - /var/run/docker.sock:/tmp/docker.sock:ro
          - certs:/etc/nginx/certs:ro
          - conf:/etc/nginx/conf.d
          - /etc/nginx/vhost.d:/etc/nginx/vhost.d
          - html:/usr/share/nginx/html
        restart: always
        environment:
          - VIRTUAL_PROTO=https
          - VIRTUAL_PORT=443

      acme-companion:
        image: nginxproxy/acme-companion
        container_name: nginx-proxy-acme
        depends_on:
          - nginx-proxy
        volumes:
          - /etc/nginx/vhost.d:/etc/nginx/vhost.d
          - html:/usr/share/nginx/html
          - certs:/etc/nginx/certs:rw
          - acme:/etc/acme.sh
          - /var/run/docker.sock:/var/run/docker.sock:ro
        network_mode: bridge
        environment:
          - DEFAULT_EMAIL=me@example.com
          - NGINX_PROXY_CONTAINER=nginx-proxy
        restart: always

    volumes:
      conf:
      html:
      certs:
      acme:

    networks:
      default:
        name: nginx-proxy
```

博客的 docker-compose 文件：

```
    version: "3.9"

    services:
      nginx:
        image: nginx:stable
        restart: always
        volumes:
          - /home/www/public:/usr/share/nginx/html
        expose:
          - 80
          - 443
        environment:
          - VIRTUAL_HOST=www.yidajiabei.xyz,yidajiabei.xyz
          - LETSENCRYPT_HOST=www.yidajiabei.xyz,yidajiabei.xyz

      blog:
        image: tianheg/hugo:0.99.1
        volumes:
          - ...
          - ...
        environment:
          - HUGO_BASEURL=https://www.yidajiabei.xyz/

    networks:
      default:
        name: nginx-proxy
```

在 vhost.d 中创建 yidajiabei.xyz 文件：

```
    return 301 $scheme://www.yidajiabei.xyz$request_uri;
```

`$scheme` 包含了 http 和 https。

### References {#references}

- [How to Redirect NON-WWW & WWW with Nginx - LinuxCapable](https://www.linuxcapable.com/how-to-redirect-non-www-www-with-nginx/)
- [How to redirect non-www to www domain in Nginx | Linode Questions](https://www.linode.com/community/questions/18987/how-to-redirect-non-www-to-www-domain-in-nginx)
- [how to redirect no-www to www under jwilder/nginx-proxy?](https://stackoverflow.com/questions/35973947/how-to-redirect-no-www-to-www-under-jwilder-nginx-proxy)