execute
public void execute(HttpRequest request,
                    AsyncEntityProducer entityProducer,
                    AsyncExecChain.Scope scope,
                    AsyncExecChain chain,
                    AsyncExecCallback asyncExecCallback)
             throws HttpException,
                    IOException
Executes the actual HTTP request. The handler can choose to return
 a response message immediately inside the call or asynchronously
 at some later point or delegate request execution to the next
 element in the execution chain.
- Specified by:
- executein interface- AsyncExecChainHandler
- Parameters:
- request- the actual request.
- entityProducer- the request entity producer or- nullif the request
                      does not enclose an entity.
- scope- the execution scope .
- chain- the next element in the request execution chain.
- asyncExecCallback- the execution callback.
- Throws:
- HttpException
- IOException