You're seeing just the function request-exclamation-mark, go back to ExMicrosoftAzureStorage.Storage.RestClient module for more information.
Link to this function

request!(client \\ %Tesla.Client{}, options)

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request!(Tesla.Env.client(), [option()]) :: Tesla.Env.t() | no_return()

Perform request and raise in case of error.

This is similar to request/2 behaviour from Tesla 0.x

See request/2 for list of available options.