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Comment by debacle | Hacker News Reader

You can write RESTful SOAP, I don't think the two ideas are perpendicular. The problem with SOAP is more implementation than spec - PHP SOAP is different from .NET SOAP which is (slightly) different from Java SOAP, which leads to headaches.

REST is just a style of API. You can write a JSON API that isn't RESTful just as easily, and in some cases a RESTful API is not warranted.

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Do you have an example of RESTful SOAP? I think SOAP's lack of situational HTTP method adoption (i.e. it uses GET or POST for everything, vs DELETE/PUT/etc. when appropriate), and the fact that it wraps another envelope around an already available HTTP envelope makes is hard to deem any SOAP implementation as RESTful. I'm not trying to prove you wrong, I'd just like to see an example (a quick google search yielded nothing for me).

REST was initially described in the context of HTTP, but is not limited to that protocol. You could write a RESTful SAML in SOAP in JSON API, if you desired.

Fox Sports has a pretty restful XML API. I can't remember if it's SOAP specifically, though.

I think you may be confused on the meaning of 'perpendicular'

Nope. Guy's got it right. 'Perpendicular' (or 'orthogonal' if you prefer), meaning that the concerns are on separate axes, and thus independent of each other.

SOAP is a bit weird because it's both an envelope/delivery mechanism as well as a discovery/interface negotiation methodology.

REST is just straight up a set of interface design principles. It doesn't care what you're delivering, it doesn't care about the channel you deliver it through.

Um... "You can write RESTful SOAP, I don't think the two ideas are perpendicular." (emphasis mine)

He's saying they aren't perpendicular and also saying they are independent.

RESTful SOAP? To read anything you have to POST the SOAP envelope.

That doesn't make it impossible to do. REST is traditionally implemented on HTTP, but the core goals and methodologies could be implemented over any protocol.

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