HTTP 状态代码和 DNS 循环
假设我有两台服务器，并且设置了 DNS 循环，如下所示：
www IN A 192.168.0.2
www IN A 192.168.0.3
从此 常见问题解答，它指出“所有最新的浏览器（IE、Firefox、Safari 和 Chrome）都支持客户端重试（有时称为浏览器重试），因此当由于服务器关闭而超时时，它会执行重试。将重试并命中循环中的下一个服务器”。
我的问题是：如果我想让192.168.0.2中的Web服务器保持运行，它应该返回什么（HTTP状态代码？连接拒绝？）以便某些请求（例如主机头= cde.com）被重定向到192.168。 0.3？
更新： 或者如果主机标头不匹配，我应该关闭 tcp 套接字吗？
Suppose I have two servers and I have set up DNS round robin as following:
www IN A 192.168.0.2
www IN A 192.168.0.3
From this FAQ, it states that "all of the latest browsers (IE, Firefox, Safari, and Chrome) support a client retry (sometimes called browser retry). So when it times out because a server is down, it will retry and hit the next server in the round robin".
My question is: If I want to let the web server in 192.168.0.2 stay running, what should it return (HTTP status code? connection refuse?) so that some request (e.g. host header = cde.com) are redirected to 192.168.0.3?
UPDATE:
Or should I just close the tcp socket if the host header does not match?
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我认为您所指的重试发生在 TCP/IP 级别 - 如果您返回 HTTP 响应，您几乎是在说“嗨！我是网络服务器！我还活着！”
那么您可以尝试在 .2 服务器上使用 iptables 阻止所有端口 80 流量，也许使用一些额外的规则来让您继续测试？
编辑：因为那不会飞，我建议在网络服务器前面放置一些HTTP级别的东西，例如 haproxy，让您平衡和管理传入请求。
I think the retry you are referring to is occurring at the TCP/IP level - if you return an HTTP response, you are pretty much saying "Hi there! I'm a webserver! I'm alive!"
What you could try then is blocking all port 80 traffic using iptables on the .2 server, perhaps with some extra rules to let you continue testing?
Edit: since that won't fly, I'd suggest putting something at the HTTP level in front of the webservers, such as haproxy, to let you balance and manage the incoming requests.
对于 Mozilla 来说，重试基本上意味着：如果与第一个 IP 地址建立连接失败（例如主机无法访问、连接建立超时或连接被拒绝），则将使用第二个 IP 地址。
如果有人真的想知道的话，我可能可以找到代码的 lxr 链接。
（对于代理自动配置文件，还有更复杂的行为）。
因此，在这些情况下，您的网络服务器实际上并未编写浏览器收到的响应。 因此，无需编码。
In the case of Mozilla, the retry basically means: if there is a connection establishment failure (like host unreachable, connection establishment timeout, or connection refused) to the first IP address, the second IP address will be used.
I could probably find the lxr link to the code, if someone really wanted to know.
(For Proxy Auto Config files, there is a more complicated behavior as well).
So, in these cases, they would be situation where your web server does not actually compose a response that the browser receives. So, no coding required.