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Roy thomas fielding doctoral dissertation
reuse. It is the definitive source for representations of its resources and must be the ultimate recipient of any request that intends to modify the value of its resources. Intermediaries can also be used to improve system scalability by enabling load balancing of services across multiple networks and processors. In addition to static documents, requests could identify services that dynamically generated responses, such as image-maps Kevin Hughes and server-side scripts Rob McCool. C2 applications rely on asynchronous notification of state changes and request messages. Rest enables intermediate processing by constraining messages to be self-descriptive: interaction is stateless between requests, standard methods and media types are used to indicate semantics and exchange information, and responses explicitly indicate cacheability. 1 The purpose of some of the strictness of this and other rest constraints, Fielding explains, is "software design on the scale of decades: every detail is intended to promote software longevity and independent evolution. 5.3.2 Connector View A connector view of an architecture concentrates on the mechanics of the communication between components. An interesting observation is that the most efficient network request is one that doesn't use the network. A representation consists of data, metadata describing the data, and, on occasion, metadata to describe the metadata (usually for the purpose of verifying message integrity). Option 3 allows the sender to remain simple and scalable while minimizing the bytes transferred, but loses the advantages of information hiding and requires that both sender and recipient understand the same data types.
Fielding Dissertation : chapter 5: Representational State
Representational state transfer, wikipedia
The early Web architecture, as portrayed by the diagram. A similar example from software engineering is the separate identification of a version-controlled source code file when referring to the "latest revision "revision number.2.7 or "revision included with the Orange release." This abstract definition of a resource enables key features of the Web architecture. Section.4.3 figure 5-3 such that each request steve reich essay from client to server must contain all of the information necessary to understand the request, and cannot take advantage of any stored context on the server. The ability to understand new media types can be acquired at run-time through " code-on-demand " provided to the client by the server. Placing shared caches at the boundaries of an organizational domain can result in significant performance benefits 136. At the same time, however, the organization's firewall may prevent the transfer of Java applets from external sources, and thus to the rest of the Web it will appear as if those clients do not support code-on-demand. The following sections describe the constraints added to the Web's architectural style in order to guide the extensions that form the modern Web architecture.