Asks the server connector to immediately commit the given response,
making it ready to be sent back to the client. Note that all server
connectors don't necessarily support this feature.
When the response is in autoCommit mode (see related property), then
calling this method isn't necessary. Also, be aware that committing the
response doesn't necessarily means that is will be immediately be written
on the network as some buffering can occurs. If you want to ensure that
response buffers are flushed,
Note that this calls back
Request#commit(Response) on the parent
request which holds the link with the underlying network connection.