/user Using PUT to replace the original resource provides a much cleaner interface that's consistent with rest 's principles and with the definition of http methods. Table 5-2: rest Connectors Connector Modern Web Examples client libwww, libwww-perl server libwww, Apache API, nsapi cache browser cache, Akamai cache network resolver bind (DNS lookup library) tunnel socks, SSL after http connect All rest interactions are stateless. The resulting tags, an XML representation of the entity to create, may be sent in the body of an http post whose request URI is the intended parent of the entity (see Listings 1 and 2). Rest works well because it does not limit the implementation of resources to certain predefined models, allowing each application to choose an implementation that best matches its own needs and enabling the replacement of implementations without impacting the user. Each option has its advantages and disadvantages. This type of URI is hierarchical, rooted at a single path, and branching from it are subpaths that expose the service's main areas. In a restful Web service, the server is responsible for generating responses and for providing an interface that enables the client to maintain application state on its own.
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Rest is about resource state manipulation through their representations on the top of stateless communication between client and server. An unfortunate design flaw inherent in many Web APIs is in the use of http methods for unintended purposes. Web servers are designed to respond to http GET requests by retrieving resources that match the path (or the query criteria) in the request URI and return these or a representation in a response, not to add a record to a database. The first is that a designer starts with nothing-a blank slate, whiteboard, or drawing board-and builds-up an architecture from familiar components until it satisfies the needs of the intended system. Resources, the resource itself is an abstraction and, in the words of the author, a resource can be any information that can be named. Like most architectural choices, the stateless constraint reflects a design trade-off. Transfer XML, json, or both A resource representation typically reflects the current state of a resource, and its attributes, at the time a client application requests. This type of response embeds links. This restriction accomplishes four functions: 1) it removes any need for the connectors to retain application state between requests, thus reducing consumption of physical resources and improving scalability; 2) it allows interactions to be processed in parallel without requiring that the processing mechanism understand the. Use http methods explicitly, one of the key characteristics of a restful Web service is the explicit use of http methods in a way that follows the protocol as defined by RFC 2616.