HttpException.A call adapter which creates Java 8 futures.
Adding this class to Retrofit allows you to return CompletableFuture from
service methods.
interface MyService {
@GET("user/me")
CompletableFuture<User> getUser()
}
CompletableFuture type parameter:
CompletableFuture<User>) returns the deserialized body for
2XX responses, sets HttpException errors for non-2XX
responses, and sets IOException for network errors.
CompletableFuture<Response<User>>) returns a
Response object for all HTTP responses and sets IOException for network
errors