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HomeOperation and MaintenanceNginxUse nginx to implement 301 jump to the root domain name of https

Use nginx to implement 301 jump to the root domain name of https

基于SEO和安全性的考虑,现在需要进行 301 跳转。以下方法使用 Nginx 作通用处理。

(推荐教程:nginx教程

实现结果

需要将以下地址都统一跳转到 https 的根域名 https://chanvinxiao.com

http://chanvinxiao.com (不带 www 的 http)
http://www.chanvinxiao.com (带 www 的 http)
https://www.chanvinxiao.com (带 www 的 https)

301 与 302 的区别

301 是永久重定向,302 是临时跳转,主要的区别在于搜索引擎对此的对待方式

301:搜索引擎会将权重和 PR 值进行转移302:搜索引擎不会进行额外处理

现在是希望搜索引擎认为原地址已经不存在了,完全转移到新地址,所以使用 301

http 跳转到 https

最简单的方法是直接在 sever 中返回一个重定向的地址,中间再加上 301 状态码(否则默认为 302)

server {
  listen 80;
  return 301 https://$host$request_uri;
}

return 和 rewrite 都属于 Nginx 的重写模块的指令,因为这里不需要对路径进行修改,所以用 return 会比较方便$host 和 $request_uri 都是 Nginx http 模块的嵌入变量,两个变量合并一起就相当于把请求的 http:// 去掉的结果

www 跳转到根域名

这个只需在 https 中作处理,因为所有 http 都跳转到 https 了

server {
  listen 443 ssl;
  server_name ~^(?<www>www\.)?(.+)$;
  if ( $www ) {
    return 301 https://$2$request_uri;
  }
...

这里利用了 server_name 的正则匹配功能,在其值前增加 ~ 即可启用,支持 PCRE 语法使用正则是为了确认是否有前缀 www. 以及捕获根域名,生成两个变量,一个是具名捕获变量 $www ,另一个是数值捕获变量 $2if 里面不支持使用数值捕获变量,否则会报错( unknown "1" variable),所以增加了 ? 将 $1 的值赋给了 $www

减少跳转次数

以上设置已经满足了实现结果,但是有一点瑕疵,就是 http://www.chanvinxiao.com 会先跳转到 https://www.chanvinxiao.com, 再跳转到 https://chanvinxiao.com ,进行二次跳转肯定是不如只需跳转一次的,所以最好让其直接一步到位,修改 http 的配置如下:

server {
  listen 80;
  server_name ~^(?:www\.)?(.+)$;
  return 301 https://$1$request_uri;
}

在 http 对应的 sever 中,把 server_name 也改为正则模式,并将 $host 用捕获的根域名 $1 取代www 在这里会直接弃掉,所以不需要捕获,使用 ?: 标示实现只分组不捕获,于是后面的根域名就成了 $1这样的结果是不管原来是否带 www,都统一跳转到不带 www 的 https 根域名

总结

以上配置中不需指定特定域名,可方便兼容和移植,使用了 Nginx 的以下特性:

server_name 的正则匹配

return 指令接收状态码和地址

$host 和 $request_uri 嵌入变量

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