Re: Header set Link?

On 11/16/24 1:52 PM, Dave Wreski wrote:
>>> Header add Link "<https://%{HTTP_HOST}e%{REDIRECT_PDF_CANONICAL_URL}e>; rel=\"canonical\"" env=REDIRECT_PDF_CANONICAL_URL
>>> However, the %{HTTP_HOST} variable doesn't seem to be set.
>> I don't think you can expect that environment variable to be defined.
>> Maybe you want to switch the value argument to use expr= syntax
>> instead so you can use more built-in values.
>
> Do you mean something like this? This doesn't appear to work :-(
>
> SetEnvIf Request_URI "(.+)\.pdf$" PDF_CANONICAL_URL=$1\.pdf
> Header always set Link "<%{HTTP_HOST}e%{REDIRECT_PDF_CANONICAL_URL}e>; 
> rel=\"canonical\"" expr=%{REQUEST_URI} =~ m#(.*)pdf$#"
>
> This is from the example provided in the docs
>
> https://httpd.apache.org/docs/2.4/mod/mod_headers.html
>
This appears to work, but I'd like to explore the expr option, as I'm 
not sure what I've created is reliable and correct.

SetEnvIf Request_URI "(.*)\.pdf$" REQUEST=$1
Header set Link '<https://example.com%{REDIRECT_REQUEST}e.pdf>; 
rel="canonical"' env=REDIRECT_REQUEST