getJson, putJson, postJson, and deleteJson are now deprecated and get, put, post, and delete can be used instead. These methods now set Accept and or Content-Type to application/json by default. To use a custom Accept or Content-Type use either the mimeType or headers options in the request:
mimeType
api.get('users.csv', { mimeType: 'text/csv' })headers
api.get('users.csv', {
headers: { Accept: 'text/csv', 'Content-Type': 'text/csv' }
})