Connectivity Framework Annex D : Assessment Template : HTTP
D . 6.4 Functional Viewpoint D . 6.4.1 Core Framework Layer Functions
Data Resource Model
( Section 4.1.1 )
ID & Addressing ( Section 4.1.2 )
Data Type System ( Section 4.1.3 )
Data Resource Lifecycle ( CRUD ) ( Section 4.1.4 )
State Management ( Section 4.1.5 )
Publish-Subscribe ( Section 4.1.6 )
Request-Reply ( Section 4.1.7 )
Discovery ( Section 4.1.8 )
Exception Handling ( Section 4.1.9 )
Does it provide a data resource model ? Summarize the salient aspects .
Yes , HTTP provides a data resource model . A data object is represented via an HTTP resource , formatted as a uniform resource identifier ( URI ) path string that is meaningful in context of the server . HTTP defines a core set of methods , GET , POST , PUT , DELETE that can be applied to the resources on a server . Resource representation returned by a server is hypertext that provides the context and links to other resources . To drive the application state , application architects will define the hypertext and the resource organization .
Does it provide a way to identifying and addressing data objects ? Summarize the identification and addressing scheme .
Yes , the HTTP resource URI path string provides a way of identifying and addressing a data object within a server . The server itself is addressed as a network IP address and port number . The result of combing the URI with the network endpoint is a Uniform Resource Locator ( URL ), expressed as http :// or https :// ( when TLS is used for security ). Does it provide a data type system ? Summarize the salient aspects .
No , HTTP does not provide a data type system .
Does it provide a means of managing a data object ’ s lifecycle ? Summarize the salient aspects .
Yes , it provides HTTP a means for managing data object lifecycles . A client can use the POST or the PUT method to create a data object ; the GET method to retrieve the data object ’ s representation ; the PUT method to update a data object ’ s representation ; and the DELETE method to delete its representation . The server controls which methods are applicable on a data object , via the response for each operation .
Does it provide a means to manage the recent history of data objects ? Summarize the salient aspects .
HTTP provides cache-mechanisms for proxies and clients to maintain responses of previous requests . These responses may contain the representations of the resources . The HTTP specification defines mechanisms for determining the freshness of the caches and provides rules for access control and applicability of a cached response .
Does it provide a means to publish and subscribe the state of data objects ? Summarize the salient aspects .
No , HTTP does not provide a means to publish and subscribe to the state of data objects . Does it provide a means to request the state of data objects ? Summarize the salient aspects .
Yes , HTTPS provides a means to request the state of data objects . This is the fundamental means of communicating using HTTP . Does it provide a means to discover the data objects ? Summarize the salient aspects .
Yes , data objects can be discovered via the embedded resource links in the hypertext .
Does it provide a means to handle exceptions when quality of service or connectivity violations happen ? Summarize the salient aspects .
HTTP does not assume that connection will be continuously available . It supports request timeout error code , when a server does not receive a complete request within the time it was prepared to wait . When service on a resource is unavailable , a server can inform the client to retry after a certain amount of time .
IIC : PUB : G5 : V1.0 : PB : 20170228 - 97 -