Improve error handling when a request fails due to the persistent connection being expired

[timabbott]

Some networks drop long-lived inactive TCP connections, which can lead to connection errors when using the Zulip API bindings for some persistent jobs. We should ideally either enable a keep-alive, or perhaps a transparent retry for this class of connection error.

See zulip/zulip@ff647df for an example.

[Beanpen]

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[Beanpen]

Hi @timabbott I wonder if you mean to remove all the alias of "client = zulip.Client(...)" and instead directly call "zulip.Client(...)" in all files. Thank you!

[zulipbot]

@Beanpen You have been unassigned from this issue because you have not made any updates for over 14 days. Please feel free to reclaim the issue if you decide to pick up again. Thanks!

[ryansong13]

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[zulipbot]

Welcome to Zulip, @ryansong13! We just sent you an invite to collaborate on this repository at https://github.com/zulip/python-zulip-api/invitations. Please accept this invite in order to claim this issue and begin a fun, rewarding experience contributing to Zulip!

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[ryansong13]

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