Nginx:何时使用proxy_set_header主机$ host与$ proxy_host [英] Nginx: when to use proxy_set_header Host $host vs $proxy_host

问题描述

我一直在阅读反向代理，并且想知道proxy_set_header Host $host是否适合proxy_set_header Host $proxy_host.我做了一些研究，并在此文章中说，在大多数情况下，我们将Host设置为$ host.那么，为什么nginx默认为$ proxy_host?为了帮助我更具体地理解，请配置反向代理

I've been reading up on reverse proxying and am wondering when proxy_set_header Host $host is appropriate over proxy_set_header Host $proxy_host. I did some research and in this article it says that in most cases we set Host to $host. Then why does nginx default to $proxy_host? To help me understand more concretely, will the reverse proxy configuration here (bottom of article) still work if we use $proxy_host instead?

谢谢

推荐答案

通常，无需显式执行proxy_set_header Host proxy_host，因为它是默认设置.如果您需要使用除proxy_pass指令之外的其他 调用服务器，则需要通过proxy_set_header something进行覆盖.

In general there is no need to explicitly do proxy_set_header Host proxy_host because it's the default. If you need to call a server by something other than what is in the proxy_pass directive, then you will need to override via proxy_set_header something.

如果您要像server_name指令中一样代理相同主机，那么您将有机会使用proxy_set_header $host.如果实际的应用程序可能托管在另一个端口或某个内部服务器上，通常会是这种情况.

If you want to proxy the same host as was in your server_name directive, then you would have occasion to use proxy_set_header $host. This would commonly be the case if perhaps the actual application is hosted on another port or on some internal server.

server {
    listen 80;
    server_name site.example.com;

    location / {
       proxy_set_header Host $host;
       proxy_pass http://localhost:8080;
    }
}

如果您要呼叫上游的名称不是其实际的DNS名称，那么您可能会有类似的内容:

If the name you are calling the upstream is not its actual DNS name, then you might have something like:

# 192.168.2.1 responds to site.example.com, but
# site.example.com doesn't actually resolve to 192.168.2.1
proxy_pass http://192.168.2.1;
proxy_set_header Host site.example.com;

另一种情况可能是基于名称的"虚拟主机，其中上游有一个有用的DNS名称，但是您想用另一个名称来调用它.

Another case might be for "name-based" virtual hosting where there is a useful DNS name for the upstream, but you would like to call it by another name.

proxy_pass http://origin.example.com;
proxy_set_header Host site.example.com

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