kaldesai commented on code in PR #541:
URL:
https://github.com/apache/incubator-kie-kogito-docs/pull/541#discussion_r1496888784
##########
serverlessworkflow/modules/ROOT/pages/core/custom-functions-support.adoc:
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@@ -531,7 +531,91 @@ kogito.sw.functions.greet.timeout=5000 <1>
----
<1> Time in milliseconds
-== Custom function types
+== Rest Custom Function
+
+Serverless Workflow Specification defines the
xref:service-orchestration/orchestration-of-openapi-based-services.adoc[OpenAPI
function type], which is the preferred way to interact with existing REST
servers.
+However, sometimes a workflow shoud interact with several REST APIs which are
not described using an OpenAPI specification file. Since generating such file
for these services might be a tedious exercise, {product_name} offers REST
custom type as a shorcut.
+
+When using custom rest, in the function definition you specify the HTTP URI to
be invoked and the HTTP method (get, post, patch or put) to be used, using
`operation` string. When the function is actually invoked you pass the request
arguments as you do when using an OpenAPI function.
+
+The following example shows the declaration of a `rest` function:
+
+.Example of a `rest` function declaration
+[source,json]
+----
+{
+ "functions": [
+ {
+ "name": "multiplyAllByAndSum", <1>
+ "type": "custom", <2>
+ "operation": "rest:post:/numbers/{multiplier}/multiplyByAndSum" <3>
+ }
+ ]
+}
+----
+
+<1> `multiplyAllAndSum` is the function name
+<2> `custom` is the function type
+<3> `rest:post:/numbers/{multiplier}/multiplyByAndSum` is the custom operation
definition. In the custom operation definition:
+* `rest` is the reserved operation keyword that indicates this is a REST call.
+* `post` is the HTTP method.
+* `/numbers/{multiplier}/multiplyByAndSum` is the relative endpoint.
+
+When using relative endpoints you must specify the host as a property. The
format of the host property is `kogito.sw.functions.<function_name>.host`.
Therefore, in this example, the host property key is
`kogito.sw.functions.multiplyAllByAndSum.host`. You might override the default
port (80) if needed by specifying `kogito.sw.functions.multiplyAllAndSum.port`
property.
Review Comment:
```suggestion
When using the relative endpoints you must specify the host as a property.
The format of the host property is `kogito.sw.functions.<function_name>.host`.
Therefore, in this example, `kogito.sw.functions.multiplyAllByAndSum.host` is
the host property key. You might override the default port (80) if needed by
specifying `kogito.sw.functions.multiplyAllAndSum.port` property.
```
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