10 февраля 2012, 02:44 от "jwilson" <nginx-forum@nginx.us>:
> To avoid SEO issues on my subdomains, I need to add a "Link" header to
> support Google's canonical header. The format is as follows (from
> http://googlewebmastercentral.blogspot.com/2011/06/supporting-relcanonical-http-headers.html):
>
> Link: http://www.example.com/white-paper.html; rel="canonical"
>
> So, the add_header command would need to reference $uri, but it also
> needs a semi-colon and double quotes. How can I add this header to my
> config?

location ~* ^/(.*)(\.pdf)$ {
add_header Link "<$scheme://$host:$server_port/$1.html>; rel=\"canonical\"";
}

You can use $http_host instead of $host:$server_port, but if you get
a request without the Host header, $http_host will be empty.

Max
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