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Anatomy of a Web APIIn this chapter, you will learn the basic concepts of Web APIs that I use throughout the rest of thebook. Web APIs are application programming interfaces that can be called over standard Internetprotocols. Many companies are using Web APIs to expose functionality in their existing systemsina platform-neutral manner. Other companies are building applications from the ground up asWeb APIs. Web APIs generally allow remote computers on different platforms to talk to eachotherusing methods that were previously very difficult. This chapter will specifically cover thefollowing: .What a Web API is and how it differs from a Web service .The current status of Web APIs in the industry .Calling a Web API using REST (HTTP-GET) .Calling a Web API using HTTP-POST .Calling a Web API using HTTPand SOAPWeb APIs versus Web ServicesWeb APIs are application programming interfaces that are available over the Internet. They arealso sometimes referred to as Web services. It is helpful to think of a Web API as a series of Webservices, each of which has one or more procedures that can be called using the Internet. An exam- ple of a Web API includes the Google API, which makes various search functions available overthe Internet for use in third-party applications. Although Web APIs and Web services are separateconcepts, it is common and acceptable to refer to the two concepts interchangeably because theyare so closely related.

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