1. Developing Applications with Oracle Visual Builder in Oracle Integration Generation 2
  2. Connect Applications to Data
  3. Work with Services
  4. Manage Backends in Your Visual Application
  5. Set the Backend's Authentication Method and Connection Type
  6. What is CORS?

What is CORS?

CORS (Cross-origin request sharing) is a mechanism that restricts a web page on one domain calling APIs hosted on another domain from browser-based JavaScript.

To allow such calls, the server hosting the APIs has to allow the domain of the web page to call by enabling CORS for the web page domain. The rules for CORS are built within the browser and are used to secure the user from arbitrary hosted scripts calling any APIs. See this blog for more details. If the API server has not enabled CORS for the web page, then calling the API via Fetch or AJAX from the browser results in a JavaScript error.