Re: [fetch] need setHeaderFunction( request => newHeaders ) function called before request sent (#156)

With the current Fetch implementations I have succeeded in authenticating to a remote web server as [described here](https://github.com/solid/solid-spec/issues/52#issuecomment-157519949) using the WebCrypto API to implement HTTP Signatures.

The issue here would perhaps be needed if the client wanted to sign every chunk of a response, supposing it were quite large.

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