public interface OutboundRequestHandle
ConnectionEndpoint. The same handle is associated with all
OutboundRequest instances produced by the same OutboundRequestIterator (that is, all attempts to send the same
request).
An OutboundRequestHandle is an opaque cookie
provided to a ConnectionManager by a connection-based
Endpoint implementation (via ConnectionManager.newRequest) in
order to identify the request in later invocations of certain
ConnectionEndpoint and Connection methods. The
handle encapsulates information about the constraints for the
request and any other request-specific information needed by the
transport implementation.