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But this is only for JavaScript clients, right? I believe all the OAuth APIs I've consumed from Python send access_token in the query string.

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Maybe you are thinking of the code parameter? The one that can be exchanged for an access token in a server-to-server request?

I believe they're both in the query string, but you're right - code is what's sent by way of the client. access_token is exchanged between the servers.

what provider? Facebook never sends it in query string. It can also be available for Man In The Middle, in server side logs etc. Hash is supposed to be more secure.

FB definitely sends access token via URL param for the server side flow: https://developers.facebook.com/docs/howtos/login/server-sid...

If there were a mitm they could get it even if it's in the hash. It has to travel to the client at some point.

if it's in hash it can be seen only from FB response (https). redirect_uri can be http so hash is not transferred

of course it's visible in server-2-server, but not client-server

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