@uppy/tus - Add onShouldRetry options

[vp-aridhia]

Hello 👋

Currently, tus-js-client supports onShouldRetry https://github.com/tus/tus-js-client/blob/master/docs/api.md#onshouldretry, which is also used internally by the @uppy/tus plugin. I'm currently having an issue when I'd like to also retry 401 responses after I refetch a new, valid auth token using a combination of onBeforeRequest and onAfterResponse.

Currently, I'm extending the plugin and replacing the bits I need to achieve this (upload method). But this would feel like a pretty good addition to the @uppy/tus.

[Murderlon]

The retrying with exponential backoff is intricate and error prone logic to write yourself. We write that for you and test it so you don't have to worry about it. Perhaps it's better to only expose what HTTP status codes you want to retry on?

[vp-aridhia]

That would definitely be a viable strategy in our case.