Web Services
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The document discusses different approaches to building web services: - Remote Procedure Call (RPC) uses SOAP and WSDL but is complicated to implement. - RESTful services use standard HTTP methods to interact with resources through clean URLs and return data in XML or JSON formats. REST services are easier to build and consume. - REST focuses on stateless resources and uses HTTP verbs like GET, PUT, POST and DELETE to perform CRUD operations on resources accessed through URLs.
Web Services
- 1. Or “How I learned to stop worrying and love HTTP”
- 2. A service that is accessed using web- standard methods HTTP Consumers of a web service don’t need to know anything about the platform, object model, or programming language used to implement the service, they just need to know how to HTTP
- 3. Remote Procedure Call • Basically calling the methods of an object located on a server instead of in memory • uses Simple Object Access Protocol (SOAP) Standard used to represent method calls and return values Uses Web Service Definition Language (WSDL) to communicate what is expected for input and output
- 4. • Soap is kind of complicated • Proxy class generators were created • see: Add (Service) Reference
- 5. Relies on event-driven message passing for communication Other fancy words include “enterprise service bus”, “event driven architecture” Almost all solutions are vendor-specific or home-brewed, terribly expensive and complicated I will not be showing an example of this today :P
- 6. A service that doesn’t require any of the SOAP stuff Data usually returned in XML or JSON format Structured so that multiple web services can be combined into single applications “aka mashups” Resource focused as opposed to action focused (nouns over verbs)
- 7. aka REST Uses HTTP Verbs to perform actions with resources • Create = PUT, Read = GET, Update = POST (or PATCH), Delete = DELETE Focus on stateless resources and clean URLs • i.e. server.com/customers/5/invoices instead of server.com/customers?id=5&show=invoices
- 9. HATEOAS Restafarianism OData