swagger: "2.0"
paths:
  /widgets/:
    get:
      summary: Retrieve all widgets.
      parameters:
        - name: category_id
          in: query
          description: Return the widgets that are associated with this category.
          required: true
          type: array
          collectionFormat: "multi"
          items:
            type: string
            pattern: '^[0-9abcdefghjkmnpqrtuvwxyz]{29}$'
definitions: {}
