This behavior can be used to serve internal REST API's.
Parameter
Description
URI
The aim of the call.
Method
HTTP request method.
Payload
The content to be sent.
Result
The result passed to the behavior actions.
These are used, among other things, for the 'Portal Light' to obtain the logs of profiles, for example.

The URI is evaluated as a Calculation expression and must define a relative path. Payload defines the object to be sent, $input means here that the incoming data will be sent.
The result object can be accessed in the result expression ($input). The data resolved here is passed to the behavior actions.