Accessing HTTP Headers via Flow

Overview 

Due to the possibility that some REST calls may not contain Body content, and some integrations may require information not found in the Body, oftentimes a User may need to obtain Header data. Headers contain certain things that pertain to a REST service, such as Authorization or Authentication information, the type of REST method (such as GET, POST, PATCH, etc), and custom application-specific header information.
To aid in obtaining this information, Users may utilize a workflow to obtain HTTP Headers. The following example demonstrates how to achieve this via Flow in Decisions. 

Example

1. From a Project, select CREATE FLOW and CREATE a new Flow. 
2. From the Flow Designer, add a Create Data step and click Show Editor. 
3. From here, add an Input, name it Request Headers, select DataPair as the type and check the Is List box. Once the Input data has been created, save and close the window.  
4. Select the Create Data step and navigate to the Inputs section. Select Flow Data on the Input, and then map Flow Data > Request Headers.
5. Click Debug, and select Inputs/Outputs. 
6. The resulting Output Data will be a list of each Datapair found within the HTTP Headers.