SEO/href-lang-tags

// app/controllers/post_controller/postcontroller.go
package postcontroller

func (c *PostsController) Show(post *Post) error {
	c.Language(post.Language)
	c.Canonical("https://example.com/" + post.Language + "/posts/" + post.Slug)
	c.Alternate("en", "https://example.com/en/posts/"+post.Slug)
	c.Alternate("de", "https://example.com/de/posts/"+post.Slug)
	c.Alternate("x-default", "https://example.com/posts/"+post.Slug)
	c.Set("post", post)
	return nil
}