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But it's not a random walk. And it sure beats custom apis returning random bags of data for any given UI screen.

Sometimes you do a few more web calls than you might otherwise. If you can get away with it then great! Because the benefits are plenty

Hell! Even just having the uri of where the resource came from is useful enough. That's before you've introduced related resources.

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At this point aren't you still hard coding commands, but using "links" rather than URLs? And doesn't the dependency on every link in the chain outweigh one - easily maintained - URL?

You're hard-coding 'terms' from a hypermedia 'vocab'.

The thing is, if you use well-known terms, your client will work against ANY API that uses those terms, not just the one that you coded it to work against.

Not only that, but the APIs will have flexibility to move things around, or delegate functionality to other hosts by linking through.

As for the cost of walking the chain, once a target resource has been found the can be cached, and you only need to rewalk if the resource 404/410s.

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