Unlocking the secrets of REST with WCF Glenn Block Blogs/msdn.com/gblock @gblock

REST, Definition vs Practice REST by definition is clear In practice REST is a highly overloaded term REST in practice means over HTTP

Richardson’s HTTP Maturity model Hypermedia HTTP URI

Level 0 – Single URI / Single Verb SOAP Envelope (POST) Create Update \OrderService.svc Order System Submit Delete Cancel Approve Find

Level 1 – Multi URI / Single Verb XML/JSON – GET Create Orders/Create Update Orders/Update Order System Submit Orders/Submit Delete Orders/Delete Cancel Orders/Cancel Approve Orders/Approve Find Orders/Find

Level 2 – Multi URI / Multi Verb XML/JSON/ATOM PUT Orders/ POST Orders/1234 POST Order System Orders/Submitted DELETE Orders/1234 POST Orders/Cancelled POST Orders/Approved GET Orders/1234

Level 2 – Hypermedia aware Custom media types GET Orders/ <link rel=“Update” …/> Orders/1234 <link rel=“Submit” …/> Order System Orders/Submitted <link rel=“Delete” …/> Orders/1234 <link rel=“Cancel” …/> Orders/Cancelled <link rel=“Approve” …/> Orders/Approved <link rel=“View” …/> Orders/1234

Hypermedia what? HTTP/1.1 200 OK Content-Length: 421 Content-Type: application/vnd.ConstosoOrders+xml Date: Sun, 3 May 2009 18:22:11 GMT <order xmlns="http://contoso.com" xlmns:atom="http://www.w3.org/2005/Atom"> <OrderID>1234</OrderID> <-- Order details --/> <link rel=“Submit” href=“http://contoso.com/Orders/1234/Submitted”/> <link rel=“Delete” href=“http://contoso.com/Orders/1234”/> <link rel=“Cancel” href=“http://contoso.com/Orders/1234/Cancelled”/> <link rel=“Approve” href=“http://contoso.com/Orders/1234/Approved”/> <link rel=“View” href=“http://contoso.com/Orders/1234”/> </order>

Browser Devices WCF Silverlight Desktop Reach any client WCF already supports exposing services over HTTP. We have heard for you that is a good start but you want us to go further Desktop

Code is easier to maintain Service Separation of concerns Testability "Raw" HTTP HTTP Concerns Simplified Configuration

Separating out HTTP and other concerns Application concerns / CLR Objects Handler HTTP Message Operation Low Level HTTP specific concerns / HTTP Only Http Channel HTTP Message

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