Note

This documentation is for a development version of IPython. There may be significant differences from the latest stable release.

Module: html.base.zmqhandlers

Tornado handlers for WebSocket <-> ZMQ sockets.

2 Classes

class IPython.html.base.zmqhandlers.ZMQStreamHandler(application, request, **kwargs)

Bases: tornado.websocket.WebSocketHandler

allow_draft76()

Allow draft 76, until browsers such as Safari update to RFC 6455.

This has been disabled by default in tornado in release 2.2.0, and support will be removed in later versions.

check_origin(origin)

Check Origin == Host or Access-Control-Allow-Origin.

Tornado >= 4 calls this method automatically, raising 403 if it returns False. We call it explicitly in open on Tornado < 4.

clear_cookie(*args, **kwargs)

meaningless for websockets

class IPython.html.base.zmqhandlers.AuthenticatedZMQStreamHandler(application, request, **kwargs)

Bases: IPython.html.base.zmqhandlers.ZMQStreamHandler, IPython.html.base.handlers.IPythonHandler

ping_interval

The interval for websocket keep-alive pings.

Set ws_ping_interval = 0 to disable pings.

ping_timeout

If no ping is received in this many milliseconds, close the websocket connection (VPNs, etc. can fail to cleanly close ws connections). Default is max of 3 pings or 30 seconds.

pre_get()

Run before finishing the GET request

Extend this method to add logic that should fire before the websocket finishes completing.

send_ping()

send a ping to keep the websocket alive

set_default_headers()

Undo the set_default_headers in IPythonHandler

which doesn’t make sense for websockets

2 Functions

IPython.html.base.zmqhandlers.serialize_binary_message(msg)

serialize a message as a binary blob

Header:

4 bytes: number of msg parts (nbufs) as 32b int 4 * nbufs bytes: offset for each buffer as integer as 32b int

Offsets are from the start of the buffer, including the header.

Returns:The message serialized to bytes. :

IPython.html.base.zmqhandlers.deserialize_binary_message(bmsg)

deserialize a message from a binary blog

Header:

4 bytes: number of msg parts (nbufs) as 32b int 4 * nbufs bytes: offset for each buffer as integer as 32b int

Offsets are from the start of the buffer, including the header.

Returns:message dictionary :