Provider responds with data on how resource can be embedded, either as JSON or XML
e.g.
{
"type": "photo",
"flickr_type": "photo",
"title": "Hubble Marks 30 Years in Space With Tapestry of Blazing Starbirth",
"author_name": "NASA Goddard Photo and Video",
"author_url": "https://www.flickr.com/photos/gsfc/",
"width": 1024,
"height": 703,
"url": "https://live.staticflickr.com/65535/49812640738_e4c3044865_b.jpg",
"web_page": "https://www.flickr.com/photos/gsfc/49812640738/",
"thumbnail_url": "https://live.staticflickr.com/65535/49812640738_e4c3044865_q.jpg",
"thumbnail_width": 150,
"thumbnail_height": 150,
"web_page_short_url": "https://flic.kr/p/2iTLNDq",
"license": "Attribution License",
"license_url": "https://creativecommons.org/licenses/by/2.0/",
"license_id": "4",
"html": "<a data-flickr-embed=\"true\" href=\"https://www.flickr.com/photos/gsfc/49812640738/\" title=\"Hubble Marks 30 Years in Space With Tapestry of Blazing Starbirth by NASA Goddard Photo and Video, on Flickr\"><img src=\"https://live.staticflickr.com/65535/49812640738_e4c3044865_b.jpg\" width=\"1024\" height=\"703\" alt=\"Hubble Marks 30 Years in Space With Tapestry of Blazing Starbirth\"></a><script async src=\"https://embedr.flickr.com/assets/client-code.js\" charset=\"utf-8\"></script>",
"version": "1.0",
"cache_age": 3600,
"provider_name": "Flickr",
"provider_url": "https://www.flickr.com/"
}Provider handles request and determines what resource should look like in an embedded context