[icebraining]

So you could write an app against the API of some service, then a competitor of that service comes and implements the same API, and so you want to switch.

What should you do? Replace every URL? What if you want to support both (say, Twitter and Identi.ca)? Should you implement a map from codename ⇒ url?

Now what if you want to support every possible implementation, even if you - the developer - don't know about them? Why shouldn't the user be able to plug-in the entry URL and use your app?

People snickering about hypermedia APIs seem to me like people ridiculing the idea of having standard ports and protocols for devices, because they can't imagine a world where you don't have to install yet another crappy 200MB driver that is only available for Windows 95 to use a damned mouse.

[programminggeek]

I think that assumes some serious hand waving on the part of both your app and the api's. Assuming that just pointing at the root of another API is going to mean your app will magically behave properly using both API's is making a lot of assumptions either in your app about how the API's work. For example, say one API calls a delete call "delete", another calls it "remove", another calls it "obliterate", and at the same time one API takes an id on that method as input, another takes an email address, another takes a username. In that scenario your app might be written to remove something based off an id and when you switch API's the new one expects you to obliterate based on username. Hypermedia doesn't save you there.

I'm all for pluggable protocols and standards, but Hypermedia links in your API don't magically get you there. They might help, but no more than a standard spec with standard URL patterns would.

[thibauts]

Both service will still not have the same resources behind the same IDs, even though they would provide the same services behind the same path. What you would have to do is use the same code to interact with two endpoints differing only by their domain. You could then use the resources delivered by both (statuses in you exemple) in one big merged list, each status still having in its data a pointer (URL) to the profile info of the author on the right service.

[Edit: I didn't get your point right away. So I guess we agree. It's a bit late here, I guess I'm off to bed !]

[brown9-2]

Does this ever actually happen? What new web service has unveiled itself and implemented a competitors REST API?