How to use the ws4py.WS_VERSION function in ws4py

('HTTP_CONNECTION', 'upgrade')]:
            actual_value = environ.get(key, '').lower()
            if not actual_value:
                raise HandshakeError('Header %s is not defined' % key)
            if expected_value not in actual_value:
                raise HandshakeError('Illegal value for header %s: %s' %
                                     (key, actual_value))

        key = environ.get('HTTP_SEC_WEBSOCKET_KEY')
        if key:
            ws_key = base64.b64decode(key.encode('utf-8'))
            if len(ws_key) != 16:
                raise HandshakeError("WebSocket key's length is invalid")

        version = environ.get('HTTP_SEC_WEBSOCKET_VERSION')
        supported_versions = b', '.join([unicode(v).encode('utf-8') for v in WS_VERSION])
        version_is_valid = False
        if version:
            try: version = int(version)
            except: pass
            else: version_is_valid = version in WS_VERSION

        if not version_is_valid:
            environ['websocket.version'] = unicode(version).encode('utf-8')
            raise HandshakeError('Unhandled or missing WebSocket version')

        ws_protocols = []
        protocols = self.protocols or []
        subprotocols = environ.get('HTTP_SEC_WEBSOCKET_PROTOCOL')
        if subprotocols:
            for s in subprotocols.split(','):
                s = s.strip()

('HTTP_CONNECTION', 'upgrade')]:
            actual_value = environ.get(key, '').lower()
            if not actual_value:
                raise HandshakeError('Header %s is not defined' % key)
            if expected_value not in actual_value:
                raise HandshakeError('Illegal value for header %s: %s' %
                                     (key, actual_value))

        key = environ.get('HTTP_SEC_WEBSOCKET_KEY')
        if key:
            ws_key = base64.b64decode(key.encode('utf-8'))
            if len(ws_key) != 16:
                raise HandshakeError("WebSocket key's length is invalid")

        version = environ.get('HTTP_SEC_WEBSOCKET_VERSION')
        supported_versions = b', '.join([unicode(v) for v in WS_VERSION])
        version_is_valid = False
        if version:
            try: version = int(version)
            except: pass
            else: version_is_valid = version in WS_VERSION

        if not version_is_valid:
            environ['websocket.version'] = unicode(version).encode('utf-8')
            raise HandshakeError('Unhandled or missing WebSocket version')

        ws_protocols = []
        protocols = self.protocols or []
        subprotocols = environ.get('HTTP_SEC_WEBSOCKET_PROTOCOL')
        if subprotocols:
            for s in subprotocols.split(','):
                s = s.strip()

('HTTP_CONNECTION', 'upgrade')]:
            actual_value = environ.get(key, '').lower()
            if not actual_value:
                raise HandshakeError('Header %s is not defined' % key)
            if expected_value not in actual_value:
                raise HandshakeError('Illegal value for header %s: %s' %
                                     (key, actual_value))

        key = environ.get('HTTP_SEC_WEBSOCKET_KEY')
        if key:
            ws_key = base64.b64decode(key.encode('utf-8'))
            if len(ws_key) != 16:
                raise HandshakeError("WebSocket key's length is invalid")

        version = environ.get('HTTP_SEC_WEBSOCKET_VERSION')
        supported_versions = b', '.join([unicode(v).encode('utf-8') for v in WS_VERSION])
        version_is_valid = False
        if version:
            try: version = int(version)
            except: pass
            else: version_is_valid = version in WS_VERSION

        if not version_is_valid:
            environ['websocket.version'] = unicode(version).encode('utf-8')
            raise HandshakeError('Unhandled or missing WebSocket version')

        ws_protocols = []
        protocols = self.protocols or []
        subprotocols = environ.get('HTTP_SEC_WEBSOCKET_PROTOCOL')
        if subprotocols:
            for s in subprotocols.split(','):
                s = s.strip()

def handshake_headers(self):
        """
        List of headers appropriate for the upgrade
        handshake.
        """
        headers = [
            ('Host', '%s:%s' % (self.host, self.port)),
            ('Connection', 'Upgrade'),
            ('Upgrade', 'websocket'),
            ('Sec-WebSocket-Key', self.key.decode('utf-8')),
            ('Sec-WebSocket-Version', str(max(WS_VERSION)))
            ]

        if self.protocols:
            headers.append(('Sec-WebSocket-Protocol', ','.join(self.protocols)))

        if self.extra_headers:
            headers.extend(self.extra_headers)

        if not any(x for x in headers if x[0].lower() == 'origin') and \
           'origin' not in self.exclude_headers:

            scheme, url = self.url.split(":", 1)
            parsed = urlsplit(url, scheme="http")
            if parsed.hostname:
                self.host = parsed.hostname
            else:

raise HandshakeError('Illegal value for header %s: %s' %
                                     (key, actual_value))

        key = environ.get('HTTP_SEC_WEBSOCKET_KEY')
        if key:
            ws_key = base64.b64decode(key.encode('utf-8'))
            if len(ws_key) != 16:
                raise HandshakeError("WebSocket key's length is invalid")

        version = environ.get('HTTP_SEC_WEBSOCKET_VERSION')
        supported_versions = b', '.join([unicode(v).encode('utf-8') for v in WS_VERSION])
        version_is_valid = False
        if version:
            try: version = int(version)
            except: pass
            else: version_is_valid = version in WS_VERSION

        if not version_is_valid:
            environ['websocket.version'] = unicode(version).encode('utf-8')
            raise HandshakeError('Unhandled or missing WebSocket version')

        ws_protocols = []
        protocols = self.protocols or []
        subprotocols = environ.get('HTTP_SEC_WEBSOCKET_PROTOCOL')
        if subprotocols:
            for s in subprotocols.split(','):
                s = s.strip()
                if s in protocols:
                    ws_protocols.append(s)

        ws_extensions = []
        exts = self.extensions or []

raise HandshakeError('Illegal value for header %s: %s' %
                                     (key, actual_value))

        key = environ.get('HTTP_SEC_WEBSOCKET_KEY')
        if key:
            ws_key = base64.b64decode(key.encode('utf-8'))
            if len(ws_key) != 16:
                raise HandshakeError("WebSocket key's length is invalid")

        version = environ.get('HTTP_SEC_WEBSOCKET_VERSION')
        supported_versions = b', '.join([unicode(v) for v in WS_VERSION])
        version_is_valid = False
        if version:
            try: version = int(version)
            except: pass
            else: version_is_valid = version in WS_VERSION

        if not version_is_valid:
            environ['websocket.version'] = unicode(version).encode('utf-8')
            raise HandshakeError('Unhandled or missing WebSocket version')

        ws_protocols = []
        protocols = self.protocols or []
        subprotocols = environ.get('HTTP_SEC_WEBSOCKET_PROTOCOL')
        if subprotocols:
            for s in subprotocols.split(','):
                s = s.strip()
                if s in protocols:
                    ws_protocols.append(s)

        ws_extensions = []
        exts = self.extensions or []

raise HandshakeError('Illegal value for header %s: %s' %
                                     (key, actual_value))

        key = environ.get('HTTP_SEC_WEBSOCKET_KEY')
        if key:
            ws_key = base64.b64decode(key.encode('utf-8'))
            if len(ws_key) != 16:
                raise HandshakeError("WebSocket key's length is invalid")

        version = environ.get('HTTP_SEC_WEBSOCKET_VERSION')
        supported_versions = b', '.join([unicode(v).encode('utf-8') for v in WS_VERSION])
        version_is_valid = False
        if version:
            try: version = int(version)
            except: pass
            else: version_is_valid = version in WS_VERSION

        if not version_is_valid:
            environ['websocket.version'] = unicode(version).encode('utf-8')
            raise HandshakeError('Unhandled or missing WebSocket version')

        ws_protocols = []
        protocols = self.protocols or []
        subprotocols = environ.get('HTTP_SEC_WEBSOCKET_PROTOCOL')
        if subprotocols:
            for s in subprotocols.split(','):
                s = s.strip()
                if s in protocols:
                    ws_protocols.append(s)

        ws_extensions = []
        exts = self.extensions or []

    def upgrade(self, protocols=None, extensions=None, version=WS_VERSION,
                handler_cls=WebSocket, heartbeat_freq=None):
        """
        Performs the upgrade of the connection to the WebSocket
        protocol.

        The provided protocols may be a list of WebSocket
        protocols supported by the instance of the tool.

        When no list is provided and no protocol is either
        during the upgrade, then the protocol parameter is
        not taken into account. On the other hand,
        if the protocol from the handshake isn't part
        of the provided list, the upgrade fails immediatly.
        """
        request = cherrypy.serving.request
        request.process_request_body = False

    @property
    def handshake_headers(self):
        """
        List of headers appropriate for the upgrade
        handshake.
        """
        headers = [
            ('Host', self.host),
            ('Connection', 'Upgrade'),
            ('Upgrade', 'websocket'),
            ('Origin', self.url),
            ('Sec-WebSocket-Version', str(max(WS_VERSION))),
            ('User-Agent', USER_AGENT),

            ('Sec-WebSocket-Key', self.key.decode('utf-8')),
        ]

        if self.protocols:
            headers.append(('Sec-WebSocket-Protocol', ','.join(self.protocols)))

        if self.extra_headers:
            headers.extend(self.extra_headers)

        return headers

    def upgrade(self, protocols=None, extensions=None, version=WS_VERSION,
                handler_cls=WebSocket, heartbeat_freq=None):
        """
        Performs the upgrade of the connection to the WebSocket
        protocol.

        The provided protocols may be a list of WebSocket
        protocols supported by the instance of the tool.

        When no list is provided and no protocol is either
        during the upgrade, then the protocol parameter is
        not taken into account. On the other hand,
        if the protocol from the handshake isn't part
        of the provided list, the upgrade fails immediatly.
        """
        request = cherrypy.serving.request
        request.process_request_body = False