Ability to retrieve Authorization and Dpop headers

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I posed a question to https://gitter.im/solid/app-development on 18-Mar-2021.

Impacted environment

In which environment would the proposed feature apply ?

• [ X] The browser
• Node.js
• Other (please specify): ...
• I'm not sure.

Feature suggestion

A way to use @inrupt/solid-client-authn-browser to retrieve the Authorization: and Dpop: headers without making the fetch. I want to put those headers into another e.g. PUT call generated by a 3rd party library.

Expected functionality/enhancement

I could call a JS function/method from my browser code to retrieve the headers which I could then add during events generated but a 3rd party library like Dropzone.

Actual functionality/enhancement

The capability doesn't currently exist.

Use Cases

During a Dropzone initialization event of a file upload the ability exists to modify the request headers. If I had the ability to retrieve the Authorization: and Dpop: headers I could add them to the request headers during this event creating a solid authenticated request.

The ability to etrieve the Authorization: and Dpop: headers without making a fetch doesn't currently exist in @inrupt/solid-client-authn-browser

Start by reading the @inrupt/solid-client-authn-browser authentication entry points and the existing fetch flow. Determine how Authorization and Dpop headers are produced, then define and test a browser-facing way to retrieve them for third-party requests such as Dropzone uploads.