There is the issue that I discovered in POE::Component::Client::Keepalive, but not sure if this is a bug or I missed something.

When component fires ka_request_timeout event for request with no wheel (request is in SF_QUEUE), then it executes respond_with_error, but doesn’t remove request from SF_QUEUE.

So SF_QUEUE never become empty.

And when new request executes _ka_add_to_queue, and check if SF_QUEUE is not empty then do nothing. And if currently no active connection than ka_wake_up never be executed. From this moment all new request via POE::Component::Client::HTTP returns timeouted response.