var ErrConnClosed = errors.New("fcgi: connection to web server closed")
ErrConnClosed is returned by Read when a handler attempts to read the body of a request after the connection to the web server has been closed.
var ErrRequestAborted = errors.New("fcgi: request aborted by web server")
ErrRequestAborted is returned by Read when a handler attempts to read the body of a request that has been aborted by the web server.
func Serve(l net.Listener, handler http.Handler) error
Serve accepts incoming FastCGI connections on the listener l, creating a new goroutine for each. The goroutine reads requests and then calls handler to reply to them. If l is nil, Serve accepts connections from os.Stdin. If handler is nil, http.DefaultServeMux is used.