Example of how to return a file dynamically

[ufoscout]

I am having a hard time trying to return binary data from one of my routes. My use case is that when a /download route is called, I need to return a file that depends on the caller profile and context.
I cannot use tower_http::services::ServeDir because in my case the file is selected dynamically. In addition, it could be served from the filesystem or from a database.

Would it be possible to include an example that shows how to:

• return a file from the filesystem or generic binary data
• set the response ContentDisposition/DispositionParameters/DispositionType