Step 3: Add a trigger to the flow

Triggers receive events from external sources such as Kafka, Salesforce, and GraphQL. The handlers residing in the triggers, dispatch events to flows. Flogo provides a set of out-of-the-box triggers and connectors for receiving events from external systems. In this guide, a ReceiveHTTPMessage REST trigger will be used to listen to incoming REST requests.

Add a trigger to the flow

1. In the dialog box that appears, click Start with a trigger.

   

   The Triggers Catalog dialog lists the triggers that serve a specific use case and each of them has a unique set of configurations.

   For more information about triggers listed in the catalog, refer to Triggers.

2. On the Triggers catalog page, select the Receive HTTP Message trigger.

   

3. In the trigger configuration dialog of the Receive HTTP Message trigger, perform the following tasks:

   1. Select GET as the Method.
   2. Enter /abc in the Resource path field.
   3. Click Continue.

   

4. Select Copy Schema when prompted as shown in the following image.

   

   Tip: You can define a JSON or Avro schema such that it is available for reuse across an app. An app-level schema can be used in any flow, activity, or trigger configuration where a schema editor is provided. You can simply pick an existing schema from a list.

   Currently, Flogo only supports the JSON and Avro types of schemas. For more information about defining, editing, or using the app-level schema, refer to Schemas.

   The trigger configuration dialog must automatically close to open the Flow Inputs & Outputs tab as seen in the following screen.

   

5. Collapse the Flow Inputs and Outputs tab.

You can also create a trigger before attaching a flow to it. For more information, refer to Creating a trigger without a flow.