feat: set canonical header for file #163
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File has multiple urls for same content, eg
http://domain/path/foo.pdf/@@download/file
http://domain/path/foo.pdf/@@download/file/foo.pdf
http://domain/path/foo.pdf/@@display-file/file
...
This PR is intended to define a canonical url to avoid duplication and SEO penalties.
see https://developers.google.com/search/docs/crawling-indexing/consolidate-duplicate-urls#rel-canonical-header-method