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HTTP tunnel

An HTTP tunnel is a networking technique used to create a pathway through a network, often used to expose local development servers to the internet.

Implementation

A common application of HTTP tunneling is exposing a local service running on a specific port to a public URL. For example, to expose a local web server running on port 8080, one can use a Tunneling service with the command ngrok http 8080.^[ngrok.md]

The service establishes a secure tunnel and provides a public domain (e.g., https://1bee-210-66-180-104.jp.ngrok.io) that forwards traffic to the local environment.^[ngrok.md]

Use Cases

HTTP tunnels are frequently used in the development of applications that rely on webhooks to communicate with external services.

  • Chatbots: Developing bots for platforms like Line, Telegram, and Slack often requires a public endpoint to receive messages^[ngrok.md].
  • Webhooks: Testing GitHub webhooks requires a public URL to receive callback events from the GitHub servers^[ngrok.md].

Tools

One popular tool for creating HTTP tunnels is ngrok, which offers a free tier for establishing temporary servers^[ngrok.md].

Sources

^[ngrok.md]