Images are returned with a relative path from the content API

When using the rest API to retrieve content from Confluence, if the content contains images, the image path is specified with a relative URL. e.g:

<img ... src="/wiki/download/attachments/32772/Cassie.jpg?version=1&modificationDate=1475542723490&api=v2" ... />

This means the image cannot be rendered inside a Connect add-on.