Slowloris is an HTTP connection exhaustion attack. The attack involves opening up a large number of HTTP connections from one computer and very slowly sending the request bytes over the connection. In effect, this causes the server to become unresponse and unable to process further requests if certain mitigations are not put in place. Generally slowloris only requires one attacking machine, instead of the multiple machines necessary in botnet DDoS style attacks.
Details about the attack and original implementation can be found here: https://en.wikipedia.org/wiki/Slowloris_(computer_security)
Recently I decided to take a look ...