Infrastructure2026-05-17

Webhook

Also known as: Webhook / ウェブフック

A mechanism for sending HTTP POST notifications to an external URL when a specific event occurs. Used for Slack notifications, payment completion alerts, GitHub integrations, and CI/CD triggers. The receiver only needs to expose an HTTPS endpoint.

Overview

Webhooks offer lower server load and higher real-time performance compared to polling. GitHub Actions pipelines are triggered by webhooks, starting automatically on PR and push events.

Security Considerations

Because anyone can send webhook payloads, HMAC signature verification with a secret key is essential. For a Slack notification webhook implementation example, see form notification Slack/LINE/Chatwork guide.

Related Columns

Web Development

How to Auto-Notify Slack, LINE & Chatwork from Contact Forms | Beyond Email Notifications

Learn how to send contact form submissions to Slack, LINE, and Chatwork instead of email. Share inquiries instantly with your team and dramatically improve response times.

Feel free to contact us

Webhook

Overview

Security Considerations

Related Columns

Related Terms