http://www.example.com/path/file.html/recipe.pdf
  or
http://www.example.com/path/file.html/recipe.pdf/

http://www.example.com/path/file/recipe.pdf

http://www.example.com/path/file.html
http://www.example.com/path/file/
http://www.example.com/path/file/recipe.pdf

# Found document:
http://www.example.com/path/file/recipe.pdf

# Also check parents:
http://www.example.com/path/file
http://www.example.com/path
http://www.example.com/

http://www.example.com/path/file_html/recipe.pdf

http://www.example.com/path/file.html/

<link rel="canonical" href="http://www.example.com/path/file.html"/>

http://www.example.com/path/file.html
<link rel="canonical" href="http://www.example.com/path/file.html/"/>