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  1. 1. WCF:Building RESTfulServices S Steve Maine Senior Program Manager Microsoft Corporation
  2. 2. Source:
  3. 3. 1993:Web == Content
  4. 4. Content-Driven Web Architecture  The Browser Generic client experience  URI’s Addressing and identification  HTML Common presentation format  Hyperlinks Anarchic interconnectivity  HTTP GET Common operation everything supports
  5. 5. 2008:Web == Content + Capabilities
  6. 6. Capability-Enabled WebArchitecture  Rich Browser Clients Programmability via script or plugins  HTTP Baseline application protocol Common set of operations + status codes  Domain-neutral data-oriented formats JSON, Atom/Atom Publishing Refine to support domain-specific schemas  Presentation formats HTML, CSS
  7. 7. RESTful Tenents  The Web is a graph of linked Resources  Resources are identified by URI’s  Resources support a fixed set of operations In practice, these are defined by HTTP  Applications follow links to achieve late binding REST is an architectural style, not a specification
  8. 8. REST ContinuumPurists RESTfullness Pragmatists  Well Constructed URIs  POST to 1 URI OK Querystrings OK  HTTP Verbs  HTTP Verbs  GET – Fetch  GET – Fetch  POST – Overloaded  PUT – Update/Insert  DELETE – Delete  POST – Append  AJAX Services  Standard Representations  POX OK
  9. 9. demo AJAX Services with WCF
  10. 10. webHttpBinding  New “web-friendly” WCF Binding in Fx 3.5 Allows for the development of RESTful services Does not use SOAP envelopes HTTP and HTTPS Transports Only  Supports several wire formats: XML JSON Binary (streams)
  11. 11. WebServiceHost  Specialized SerivceHost for RESTful services Eliminates need for lots of configuration Automatically configures address, binding, contract  Optimized for single-endpoint services  Use from .svc file:<%@ ServiceHost Language="C#" Debug="true" Service="Caching1.FeedService"Factory=“System.ServiceModel.Activation.WebServiceHostFactory”%>"%>
  12. 12. [WebGet] And [WebInvoke]  Binds a WCF operation to URI space and HTTP method  Indicate the HTTP Method for the operation WebGet – Don’t make me write it WebInvoke – All verbs other than GET (Method parameter takes in the name of the Verb)  Other Parameters BodyStyle – Indicates whether the Request/ Response are wrapped or not RequestFormat – Json or Xml ResponseFormat – Json or Xml 
  13. 13. UriTemplate  String that allows you to define the structure of the URI, as well as to define “Holes” The “Holes” are variables You Bind the template with parameters to fill the holes Variable [OperationContract] [WebGet(UriTemplate=“product/{productId}")] Product GetProduct(int productId);  {productId} hole / variable gets bound to productId parameter in operation
  14. 14. announcing WCF REST Starter Kit
  15. 15. WCF REST Starter Kit  Microsoft.ServiceModel.Web.dll New features supporting RESTful services  Visual Studio 2008 Templates REST Collections/Singleton Services Atom Feed/Atom Publishing Protocol HTTP/POX Services  REST Samples  Codeplex Project Released at PDC Written by WCF team Features may be included in .NET 4.0
  16. 16. demo The REST 0f WCF
  17. 17. What Weve Talked About Today  REST and the “zen” of the web  WCF features for REST scenarios [WebGet] + [WebInvoke] UriTemplate WebHttpBinding And many more…  The WCF REST Starter Kit Available today at
  18. 18. Evals & Recordings l Please fil This sess ion will r out you be availa ble as evalua tion for a record : ing at: this se ssion at
  19. 19. QA &Please use the microphonesprovided
  20. 20. © 2008 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond tochanging market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.
  21. 21. WebGet/WebInvoke Examples [OperationContract] [WebGet( ResponseFormat=WebMessageFormat.Json, UriTemplate=“product/{productId}")] ProductData GetProduct(int productId); [OperationContract] [WebInvoke( Method=“PUT", ResponseFormat=WebMessageFormat.Json, UriTemplate=“product/{productId}")] Product UpdateProduct(int productId, product p);
  22. 22. WebProtocolException  CLR Exception that can be turned into HTTP status code on the wire  Can optionally carry detail information for display in the browser [OperationContract, WebGet] Stream EchoText(string text) { if( text == null ) throw new WebProtocolException( HttpStatusCode.BadRequest ); . . . }
  23. 23. AdapterStream  Used when you want a Stream or TextWriter but don’t have one handy[OperationContract, WebGet]Stream EchoText(string text){ return new AdapterStream( textWriter => { textWriter.WriteLine("You said: "); textWriter.WriteLine(text); textWriter.Flush(); }, Encoding.UTF8);}
  24. 24. Request Interceptors  MessageInspectors at the channel layer  Think of them like a per-service pipeline  Arbitrary message manipulation prior to dispatch; can prevent dispatch too public class XHttpMethodOverrideInterceptor:RequestInterceptor { public override void ProcessRequest( ref RequestContext requestContext) { //Change the HTTP method used for dispatch based on //the X-HTTP-Method-Override header } }
  25. 25. [WebCache]  Integrates WCF operations with ASP.NET caching (requires ASP.NET Compat Mode)  Cache profile stored in Web.config[OperationContract, WebGet][WebCache(CacheProfileName="CacheFor1Min")]public Atom10FeedFormatter GetFeed(int i) { … }<system.web> <caching> <outputCacheSettings> <outputCacheProfiles> <add name="CacheFor1Min" duration="60" enabled="true" location="Any" varyByParam=“i"/> </outputCacheProfiles> </outputCacheSettings> </caching> </system.web>
  26. 26. ASP.NET Authentication Support  “It just works” with ASP.NET  Full support for Membership + Roles  Requires ASP.NET Compatibility Mode [OperationContract, WebGet] [PrincipalPermission(SecurityAction.Demand, Role=“admin")] SampleResponseBody GetData(int i, string s)