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[Comments] (1) RESTful Web Services now CC-licensed: Hey, folks, I got some pretty exciting news. Now that RESTful Web APIs has come out, there's really no reason to buy 2007's RESTful Web Services. So Sam Ruby and I and O'Reilly have gotten together and started giving the old book away. You can get a PDF from the RESTful Web APIs website or from my now-ancient RESTful Web Services site. The license is BY-NC-ND.

If you've bought RESTful Web APIs (and if you haven't, you should), you may have noticed that we promise that this will happen in a footnote of the Introduction. It took a while to get the contract amended, but now it's all complete.

Here's a direct link to the PDF in case you just want to grab the book instead of hear me talk about it.

Obviously I think the new book is a lot better than the old book, but the old book is still very good. The source code is long obsolete (this is why RWA contains no source code, only messages sent over the wire), but the sections on HTTP still hold up really well. A lot of RWS Chapter 8 went into RWA Chapter 11. With a few edits and additions, RWS Appendix B and C became RWA Appendix A and B. Those are the only bits of RWS that I reused in RWA.

From my vantage point here in 2013, my main critique of RWS is that it makes HTTP do too much of the work. It focuses heavily on designing the server-side behavior of resources under a subset of the HTTP protocol. I say "a subset" because RWS rules out overloaded POST ahead of time. You don't know what an overloaded POST request does. It's a cop-out. You're sweeping something under the rug. It's better to turn that mystery operation into a standalone resource, because at least you know what a resource does: it responds to HTTP requests.

In retrospect, RWS is that way because in 2007 hypermedia data formats were highly undeveloped whereas HTTP was a very mature technology. Nowadays it doesn't matter so much whether an HTTP request uses POST or PUT, so long as a) the state transition is described with a link relation or other hypermedia cue, and b) the protocol semantics of the HTTP request are consistent with the application semantics of the state transition. That's why RWA focuses on breaking down a problem into a state diagram rather than a set of static resources.

So, RWS is very much a 2007 book, but that's the meanest thing I can say about it. A lot of it is still useful, it's historically interesting, and I'm glad to give it away. I'd also like to give my thanks once again to Sam Ruby and O'Reilly, for their work on RWS.


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