[英]prevent Varnish double cache with N subdomains/normalize host only for varnish
I have a bunch of subdomains that look like: 我有一堆子域,看起来像:
http://u-c2f86nr3pa.example.org/?s=1
http://u-v1cfu8dsta.example.org/?s=1
Their content is different, but the static files CSS/JS/Favicon are the same. 它们的内容不同,但静态文件CSS / JS / Favicon是相同的。 I want to normalize the hostname for them, but I do not want to normalize it for the PHP script as it works based on the subdomain.
我想为它们规范化主机名,但我不想为PHP脚本规范它,因为它基于子域工作。
Is there a way I can teach varnish that these domains are common, and static should be cached once for them? 有没有办法可以教清漆这些域是常见的,静态应该缓存一次?
You can conditionally rewrite the Host header in the vcl_recv section of your Varnish configuration. 您可以有条件地重写Varnish配置的vcl_recv部分中的Host标头。 You will need a way to identify which URLs are for static content.
您需要一种方法来识别哪些URL是静态内容。 Here is an example;
这是一个例子; the specific regular expressions will depend on how your site is structured.
具体的正则表达式取决于您的网站的结构。
sub vcl_recv {
# Normalize Host if URL is one of:
# /css/* /js/* /favicon*
if (req.http.Host ~ "^u-\w+\.example\.org$" &&
req.url ~ "^/(css/|js/|favicon)")
{
set req.http.Host = "u-xxxxxxxxx.example.org";
}
}
Your backend web server will see the rewritten Host, so make sure you normalize to a name that it recognizes. 您的后端Web服务器将看到重写的主机,因此请确保您标准化为其识别的名称。
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