更改 nginx 反向代理中的主机标头

问题描述：

我正在运行 nginx 作为站点 example.com 的反向代理，以对在后端服务器中运行的 ruby 应用程序进行负载平衡.我在 nginx 中有以下 proxy_set_header 字段，它会将主机标头传递给后端 ruby.这是 ruby 应用程序识别子域名所必需的.

I am running nginx as reverse proxy for the site example.com to loadbalance a ruby application running in backend server. I have the following proxy_set_header field in nginx which will pass host headers to backend ruby. This is required by ruby app to identify the subdomain names.

location / {
    proxy_pass http://rubyapp.com;
    proxy_set_header Host $http_host;
}

现在我想创建一个别名 beta.example.com，但是传递给后端的主机头应该仍然是 www.example.com 否则 ruby 应用程序将拒绝请求.所以我想要类似于下面的内部位置指令.

Now I want to create an alias beta.example.com, but the host header passed to backend should still be www.example.com otherwise the ruby application will reject the requests. So I want something similar to below inside location directive.

if ($http_host = "beta.example.com") {
    proxy_pass http://rubyapp.com;
    proxy_set_header Host www.example.com;
}

最好的方法是什么?

答

你不能在 if 块中使用 proxy_pass，所以我建议在设置代理头之前做这样的事情:

You cannot use proxy_pass in if block, so I suggest to do something like this before setting proxy header:

set $my_host $http_host;
if ($http_host = "beta.example.com") {
  set $my_host "www.example.com";
}

现在你可以只使用 proxy_pass 和 proxy_set_header 而没有 if 块:

And now you can just use proxy_pass and proxy_set_header without if block:

location / {
  proxy_pass http://rubyapp.com;
  proxy_set_header Host $my_host;
}

更改 nginx 反向代理中的主机标头

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