Which of the following is least likely to be used to construct or access a cloud-based API?
- a SOAP API
- the Java API
- a REST API
Of the available choices, the Java Application Programming Interface (API) is least likely to be used to construct or access a cloud-based API. The Java API is typically accessed by Java applications that are running in the Java virtual machine (VM), which is the Java component that executes compiled Java programs. The Java API is a collection of Java classes that developers can use for data collection or to build interfaces. Open APIs can be used to enable services such as billing automation and centralized management of cloud infrastructure.
Simple Object Access Protocol (SOAP) APIs can be used to construct or access cloud-based APIs. SOAP is an older API messaging protocol that uses HTTP and XML to enable communication between devices. SOAP APIs are typically more resource-intensive than REST APIs and, therefore, slower. Unlike REST APIs, SOAP APIs do not return JSON-formatted output.
Graph Query Language (GraphQL) can be used to access cloud-based APIs. GraphQL is an API query language and a runtime that is intended to lower the burden of making multiple API calls to obtain a single set of data. For example, data that requires three or four HTTP GET requests when constructed from a standard REST API might take only one request when using GraphQL. Similar to REST API, GraphQL output is in JSON format. Although GraphQL can use HTTP or HTTPS, it is not limited to those protocols.