The HTTP Event Collector (HEC) is another highly scalable way of getting data into Splunk. The HEC listens for HTTP requests containing JSON objects and sends the data that has been collected to be indexed.

In this recipe, you will learn how to configure the Splunk HTTP Event Collector to receive data coming from an example Inventory Scanner. This example inventory scan HEC configuration will be used in Chapter 10, Above and Beyond – Customization, Web Framework, REST API, HTTP Event Collector, and SDKs.

To step through this recipe, you will need a running Splunk Enterprise server. You should be familiar with navigating the Splunk user interface and using the Splunk search language. This recipe will use the open source command-line tool, curl. There are other command-line tools available, such as wget. The curl tool is usually installed by default on most Mac and Linux systems but can be downloaded for Windows systems as well.

Perform these steps to create a custom search command to format product names:

1. Log in to your Splunk server.
2. Select the Search & Reporting application.
3. Click on Settings and then on Data Inputs:
   
4. Click on HTTP Event Collector:
   
5. Click the Global Settings button:
   

6. Set All Tokens to Enabled, and set the DefaultIndex to main. Then, click the Save button:
   
7. Click the New Token button:
   
8. Set the Name to Inventory Scanner and the Source name override to inventory:scanner, and click the Next button:
   

9. Select New for the Source Type and enter inventory:scanner as the value:
   

10. Under the Index section, click on main so that it gets moved to the SelectedItem(s) list and click the Review button:
    
11. Click Review and confirm your selections, then click Submit.
12. After the form submits, you will be presented with the token. This token will be needed for the recipe in Chapter 10, Above and Beyond – Customization, Web Framework, REST API, HTTP Event Collector, and SDKs:
    

To get the HEC to work, you firstly configured a few global settings. These included the default index, default source type, and the HTTP port that Splunk will listen on. These default values, such as index and source type, will be used by the HEC, unless the data itself contains the specific values to use. The port commonly used for the HEC is port 8088. This single port can receive multiple different types of data since it is all differentiated by the token that is passed with it and by interpreting the data within the payload of the request.

After configuring the defaults, you then generated a new token, specifically for the inventory scanner data. You provided a specific source type for this data source and selected the index that the data should go to. These values will override the defaults and help to ensure that data is routed to the correct index.

The HEC is now up and running and listening on port 8088 for the inventory scan HTTP data to be sent to it.