A new 'impersonation' package provides a function which can be used to construct a context.Context object containing a Fastly CID. If that context is passed to any of go-fastly's API functions which generate HTTP requests to the Fastly API endpoint, the contained CID will be included in the request.

As noted in the package documentation, impersonation is only available to Fastly employees, it is not usable by customers.

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