Sends back a static error page.

def handle(self, sock, read_data, path, headers):
        "Sends back a static error page."
        for i in range(self.attempts):
            try:
                server_sock = eventlet.connect(
                    tuple(random.choice(self.backends)),
                )
            except socket.error:
                eventlet.sleep(self.delay)
                continue
            # Function to help track data usage
            def send_onwards(data):
                server_sock.sendall(data)
                return len(data)
            try:
                size = send_onwards(read_data)
                size += SocketMelder(sock, server_sock).run()
            except socket.error, e:
                if e.errno != errno.EPIPE:
                    raise