|http:start-http-listener &key server host port backlog reuse-address||[Function]|
Start a HTTP listener for the given server. The port is the port to listen for connections, and defaults to port 80. A host may also be defined which is useful if the system has multiple interfaces. The backlog defines the maximum length of the queue of pending connections. When reuse-address is true the socket will succeed in binding to the address except if there is already an active listening socket bound to the address. If the server already has a listener on the port then it is firstly removed.