Callback (moe.ios.core API)

```
public interface Callback
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onFailure(Request request, IOException e)`	Called when the request could not be executed due to cancellation, a connectivity problem or timeout.
`void`	`onResponse(Response response)`	Called when the HTTP response was successfully returned by the remote server.

- Method Detail
  - onFailure
```
void onFailure(Request request,
               IOException e)
```
    Called when the request could not be executed due to cancellation, a connectivity problem or timeout. Because networks can fail during an exchange, it is possible that the remote server accepted the request before the failure.
  - onResponse
```
void onResponse(Response response)
         throws IOException
```
    Called when the HTTP response was successfully returned by the remote server. The callback may proceed to read the response body with Response.body. The response is still live until its response body is closed with response.body().close(). The recipient of the callback may even consume the response body on another thread.
    Note that transport-layer success (receiving a HTTP response code, headers and body) does not necessarily indicate application-layer success: response may still indicate an unhappy HTTP response code like 404 or 500.
    
    Throws:
    
    IOException