ruby/www.ruby-lang.org — pull request #570 by makimoto (2014-01-10 08:56:20+00:00)
Title: Set canonical URL

Set canonical URL for link rel.

For instance, `http://www.ruby-lang.org/en/`, `https://www.ruby-lang.org/en/` and `https://www.ruby-lang.org/en/index.html` are all set the following canonical URL tag.
```html

```