Remote File Access (RFA) is used through a Web API with JSON messages. This API is designed to follow modern Web API best practices.
The Web API can be invoked from a variety of clients and programming languages. It is not intended to be invoked directly from a browser (for example, by entering RFA request URLs in the address bar, or using links in Web pages), but can be used with Javascript APIs such as XMLHttpRequest and fetch from Web applications. It can be invoked from the RFA online documentation which is served by the RFA listener, if not disabled, but that is intended for testing and educational purposes.
It is important to use the RFA API in a secure manner. See RFA security for more information. See RFA access to catalog and spool for more information if you are using the RFA API for catalog or spool access.