This can happen when you close your laptop overnight,
as the server will not hold onto in-memory resources
for your connection indefinitely. When this happen,
the server will HTTP 400 you with "session expired".
At this point, it is no longer safe to remember anything
and you must forget everything and resend any sticky
parameters. This commit does the sticky parameters and
re-establishes the connection, but it may need additional
work to make the JS SDK forget now invalid data.
Kegan Dougal
2cda229bc4