RequestCallback (GWT Javadoc)

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## com.google.gwt.http.client
Interface RequestCallback

    public interface RequestCallback

The primary interface a caller must implement to receive a response to a `Request`.

### Required Module

Modules that use this interface should inherit `com.google.gwt.http.HTTP`.

>     <module>
>       <!-- other inherited modules, such as com.google.gwt.user.User -->
>       <inherits name="com.google.gwt.http.HTTP"/>
>       <!-- additional module settings -->
>     </module>

Method Summary
`void` | `onError(Request request, java.lang.Throwable exception)` Called when a `Request` does not complete normally.
`void` | `onResponseReceived(Request request, Response response)` Called when a pending `Request` completes normally.

Method Detail

### onResponseReceived

    void onResponseReceived(Request request,
                            Response response)

  Called when a pending `Request` completes normally. Note this method is called even when the status code of the HTTP response is not "OK", 200.

  Parameters:
    `request` - the object that generated this event
    `response` - an instance of the `Response` class

### onError

    void onError(Request request,
                 java.lang.Throwable exception)

  Called when a `Request` does not complete normally. A `RequestTimeoutException` is one example of the type of error that a request may encounter.

  Parameters:
    `request` - the request object which has experienced the error condition, may be null if the request was never generated
    `exception` - the error that was encountered

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