Handle 401 response

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Another option would be to convert the error messages to a custom error and handle that in your code.

In other words, express in a type the fact that you expect a specific set of errors.

For example, you could have:

type Error 
    = Unauthenticated
    | ConnectionProblems 
    | ServerError String

You would then convert the Http.Error to one of these errors an react in you code to them. (i.e. redirect for Unauthenticated, suggest checking connection/retry for ConnectionProblems and log to Rollbar the ServerError.