User Instance
GET /api/users/301/?format=api
{
"username": "anagrama",
"gravatar": "//www.gravatar.com/avatar/10a17a19fbce16121b492997bee85626?d=wavatar",
"has_key": false
}GET /api/users/301/?format=api
{
"username": "anagrama",
"gravatar": "//www.gravatar.com/avatar/10a17a19fbce16121b492997bee85626?d=wavatar",
"has_key": false
}