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If a response is cacheable, then a client cache is given the right to reuse that response data for later, equivalent requests. Cache constraints require that the data within a response to a request be implicitly or explicitly labeled as cacheable or non-cacheable. In order to improve network efficiency, we add cache constraints to form the client-cache-stateless-server style of Section 3.4.4 ( Figure 5-4). In addition, placing the application state on the client-side reduces the server's control over consistent application behavior, since the application becomes dependent on the correct implementation of semantics across multiple client versions.
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The disadvantage is that it may decrease network performance by increasing the repetitive data (per-interaction overhead) sent in a series of requests, since that data cannot be left on the server in a shared context. Like most architectural choices, the stateless constraint reflects a design trade-off.
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Scalability is improved because not having to store state between requests allows the server component to quickly free resources, and further simplifies implementation because the server doesn't have to manage resource usage across requests. Reliability is improved because it eases the task of recovering from partial failures.
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Visibility is improved because a monitoring system does not have to look beyond a single request datum in order to determine the full nature of the request. This constraint induces the properties of visibility, reliability, and scalability. It is the starting point for our description of REST. From an architectural perspective, the null style describes a system in which there are no distinguished boundaries between components.
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The Null style ( Figure 5-1) is simply an empty set of constraints. Figures 5-1 through 5-8 depict this graphically in terms of how the applied constraints would differentiate the process view of an architecture as the incremental set of constraints is applied.
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REST has been developed using the latter process. Where the first emphasizes creativity and unbounded vision, the second emphasizes restraint and understanding of the system context. The second is that a designer starts with the system needs as a whole, without constraints, and then incrementally identifies and applies constraints to elements of the system in order to differentiate the design space and allow the forces that influence system behavior to flow naturally, in harmony with the system. 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. There are two common perspectives on the process of architectural design, whether it be for buildings or for software. Later sections will describe in more detail the specific constraints that compose the REST style. This section provides a general overview of REST by walking through the process of deriving it as an architectural style. Additional constraints can then be applied to form a new architectural style that better reflects the desired properties of a modern Web architecture.
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By examining the impact of each constraint as it is added to the evolving style, we can identify the properties induced by the Web's constraints. The design rationale behind the Web architecture can be described by an architectural style consisting of the set of constraints applied to elements within the architecture.
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The software architecture framework of Chapter 1 is used to define the architectural elements of REST and examine sample process, connector, and data views of prototypical architectures.
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REST is a hybrid style derived from several of the network-based architectural styles described in Chapter 3 and combined with additional constraints that define a uniform connector interface. This chapter introduces and elaborates the Representational State Transfer (REST) architectural style for distributed hypermedia systems, describing the software engineering principles guiding REST and the interaction constraints chosen to retain those principles, while contrasting them to the constraints of other architectural styles. Fielding Dissertation: CHAPTER 5: Representational State Transfer (REST)ĬHAPTER 5 Representational State Transfer (REST)