So JIRA actually has the ability to send webhooks already - we think Automation for JIRA's "Send webhook" component is more powerful though. When combined with various triggers and conditions you have more control over what gets sent and when:
Project automation - Code Barrel JIRA 2016-09-20 12-14-10.png
You can send additional headers and the issue contents along with the webhook.
Here's what will be POSTed with the example above:
RequestBin - 17gksz51 2016-09-20 12-10-48.png
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