Provide direct S3 links only if not detecting "human browser" or make it into a checkbox?

[yarikoptic]

in relation to

• Add download support for URLs "seen" on dandidav instance dandi-cli#1572

I wondered if we could/should sophisticate non-webdav HTML "frontend" to serve API URLs if detecting chrome, safari, etc human browsers.

Since "implicit" is evil, an alternative could be to add to web frontend a checkbox:

• direct S3 URLs

so it would be for a user to decide between the two. For the sake of dandi/dandi-cli#1572 we could document to "click" there to get API urls.

[jwodder]

@yarikoptic I don't like any part of this suggestion.