microsoft
Clear join-session cache only on connect_document_error
The response of joinSession api is saved in the cache (for the duration it is valid) so that, in case there is a socket disconnect, we can use the same socket endpoint from the cache instead of making a new joinSession network request. Up until now, the odsp-driver code was clearing the cache on any error that occurred on the socket, which is incorrect.
This PR changes the code such that it only clears the cache if the error is a fluid protocol error (connect_document_error), and does not clear the cache if the error is socket.io error (connect_error).
This PR also changes the name of handler variable name to socketEvent variable name. Because it is more accurately represents what the property is.
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