SAP GetWay
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SAP Gateway is the component that allows SAP systems to communicate with the outside world. In recent SAP versions, it enables communication over the internet via the HTTP protocol.
In fact, this component embeds OData services, which are based on the RESTful architecture. Some developers compare OData to "SQL for the web." While SQL queries a database via sockets, OData performs queries over the HTTP protocol.
A key strength of OData is the ability to add annotations to the service metadata. These annotations can be interpreted by a browser or a frontend framework (like SAPUI5) to automatically generate or enhance the User Interface (UI).
OData is not a built-in protocol in environments like Node.js, Java, or .NET. To build an OData API in these languages, you must use a specific library (such as Olingo or the SAP Cloud SDK). Similarly, the consumer of the service must also use a library or dependency to fully leverage OData’s advanced features.