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The OpenAPI Specification, previously known as the Swagger Specification, is a specification for a machine-readable interface definition language for describing, producing, consuming and visualizing web services. [1]
The Swagger API project was made open source in September 2011. Soon after release, a number of new components were added to the project, including a stand-alone validator and support for Node.js and Ruby on Rails. In Swagger's early years, modest traction came from small companies and independent developers.
yang-swagger is a yang-js based Swagger/OpenAPI specification generator; yangson is a Python 3 library for working with JSON encoded configuration and state data modeled using the YANG data modeling language. YANG Tools is an OpenDaylight Project toolset written in Java; Yang-Explorer - is a pyang-based Yang Browser and RPC Builder Application
These specifications are in varying degrees of maturity and are maintained or supported by various standards bodies and entities. These specifications are the basic web services framework established by first-generation standards represented by WSDL, SOAP, and UDDI. [1] Specifications may complement, overlap, and compete with each other.
The Web Application Description Language (WADL) is a machine-readable XML description of HTTP-based web services. [1] WADL models the resources provided by a service and the relationships between them. [1]
The client can then use SOAP to actually call one of the operations listed in the WSDL file, using for example XML over HTTP. The current version of the specification is 2.0; version 1.1 has not been endorsed by the W3C but version 2.0 is a W3C recommendation. [1] WSDL 1.2 was renamed WSDL 2.0 because of its substantial differences from WSDL 1.1.
An example of a popular web API is the Astronomy Picture of the Day API operated by the American space agency NASA. It is a server-side API used to retrieve photographs of space or other images of interest to astronomers, and metadata about the images. According to the API documentation, [15] the API has one endpoint:
Example 1: Vary: * Example 2: Vary: Accept-Language; Permanent RFC 9110: Via: Informs the client of proxies through which the response was sent. Via: 1.0 fred, 1.1 example.com (Apache/1.1) Permanent RFC 9110: Warning: A general warning about possible problems with the entity body. Warning: 199 Miscellaneous warning: Obsolete [21] RFC 7234, 9111 ...