By Kevin Marshall
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Additional info for Web Services on Rails
Example text
Nevertheless, if you're going to be working with web services, you need to be conversant with all three architectures: REST, XML-RPC, and SOAP. SOAP's biggest drawback is its complexity, but Rails hides most of that complexity from you. Creating a SOAP client takes four simple steps: Create an instance of a SOAP driver Define the SOAP methods you want to call Call the SOAP methods Use the results in your Rails application To demonstrate, we'll build a Google search using SOAP. , Google offers a free web service API for many of their services, including their search engine.
Both try to mimic "normal" programming operations: function calls (for XMLRPC) and remote method invocations (SOAP). REST services represent a significantly different (and arguably much simpler) paradigm. htm. The basic idea behind REST is that you don't need to make web services "look like" regular method calls or function calls. The basic HTTP operationsGET, PUT, POST, and DELETEcorrespond nicely to the four basic SQL operations: SELECT, UPDATE, INSERT, and DELETE. Therefore, it's possible to build complex applications by doing nothing more than using HTTP requests to move XML documents around.
4. 5. , eBay, and Amazon. These giants already offer their APIs to other programmers and allow for add-on services and mash-ups to develop from them--but until recently, the capability for most enterprises to do the same was limited by a myriad of competing standards and a lack of easy-to-use tools to accomplish the task. Ruby on Rails levels the playing field for companies by simplifying the process of building web services and documenting APIs. Now with Rails, enterprise-quality tools are available for all developers.