http_server

HTTP Server with OpenTelemetry Example

This guide explains how to run the example Go application, which is instrumented with OpenTelemetry to send traces to a Jaeger UI via the OpenTelemetry Collector.

Prerequisites

• Go (1.18+)
• Docker & Docker Compose

Running the Example

1. Start Backend Services

Run the OpenTelemetry Collector and Jaeger using Docker Compose. In your terminal, execute:

  docker-compose up -d

This will start the necessary services in the background.

2. Run the HTTP Server

In a new terminal window, run the Go application:

  go run main.go

You should see the message: Server with Otel is ready.

3. Send a Test Request

To generate a trace, send an HTTP request to the instrumented endpoint:

  curl http://localhost:8080/ping-otel

4. View the Trace in Jaeger

Open your web browser and navigate to the Jaeger UI: http://localhost:16686

In the UI:

• Select the httpserver service from the dropdown menu.
• Click the "Find Traces" button.
• You will see a trace for the /ping-otel request. Click on it to view the detailed waterfall diagram.

Cleanup

To stop and remove the Docker containers after you are finished, run:

  docker-compose down -v