TransferListener (AHC/Client 3.0.0.Beta3 API)

```
public interface TransferListener
```
A simple interface an application can implement in order to received byte transfer information.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onBytesReceived(byte[] bytes)`	Invoked every time response's chunk are received.
`void`	`onBytesSent(long amount, long current, long total)`	Invoked every time request's chunk are sent.
`void`	`onRequestHeadersSent(io.netty.handler.codec.http.HttpHeaders headers)`	Invoked when the request bytes are starting to get send.
`void`	`onRequestResponseCompleted()`	Invoked when the response bytes are been fully received.
`void`	`onResponseHeadersReceived(io.netty.handler.codec.http.HttpHeaders headers)`	Invoked when the response bytes are starting to get received.
`void`	`onThrowable(Throwable t)`	Invoked when there is an unexpected issue.

- Method Detail
  - onRequestHeadersSent
```
void onRequestHeadersSent(io.netty.handler.codec.http.HttpHeaders headers)
```
    Invoked when the request bytes are starting to get send.
    
    Parameters:
    
    headers - the headers
  - onResponseHeadersReceived
```
void onResponseHeadersReceived(io.netty.handler.codec.http.HttpHeaders headers)
```
    Invoked when the response bytes are starting to get received.
    
    Parameters:
    
    headers - the headers
  - onBytesReceived
```
void onBytesReceived(byte[] bytes)
```
    Invoked every time response's chunk are received.
    
    Parameters:
    
    bytes - a byte array
  - onBytesSent
```
void onBytesSent(long amount,
                 long current,
                 long total)
```
    Invoked every time request's chunk are sent.
    
    Parameters:
    
    amount - The amount of bytes to transfer
    
    current - The amount of bytes transferred
    
    total - The total number of bytes transferred
  - onRequestResponseCompleted
```
void onRequestResponseCompleted()
```
    Invoked when the response bytes are been fully received.
  - onThrowable
```
void onThrowable(Throwable t)
```
    Invoked when there is an unexpected issue.
    
    Parameters:
    
    t - a Throwable