NewRequestManager creates a new request manager.

WithBlacklist is the request option not to assign the request to the blacklisted stream ID.

WithHighPriority is the request option to do request with higher priority.

WithWhitelist is the request option to restrict the request to be assigned to the given stream IDs.

ErrClosed is request error that the module is closed during request.

ErrQueueFull is the error happens when the waiting queue is already full.

Deliverer is the interface to deliver a response.

Requester is the interface to do request.

RequestManager manages over the requests.

RequestOption is the additional instruction for requests.