Server Timing

April 30, 2026 ยท View on GitHub

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This project demonstrates how to implement Server-Timing headers in a Go application using the Fiber framework.

Prerequisites

Ensure you have the following installed:

Setup

  1. Clone the repository:

    git clone https://github.com/gofiber/recipes.git
cd recipes/server-timing

  2. Install dependencies:

    go get

Running the Application

  1. Start the application: 
    go run main.go

Example

Here is an example of how to set up Server-Timing headers in a Fiber application:

package main

import (
    "fmt"
    "log"
    "time"

    "github.com/gofiber/fiber/v3"
)

func main() {
    app := fiber.New()

    app.Use(func(c fiber.Ctx) error {
        start := time.Now()
        err := c.Next()
        // dur value must be in milliseconds per W3C spec
        c.Append("Server-Timing", fmt.Sprintf("app;dur=%.2f", float64(time.Since(start).Microseconds())/1000.0))
        return err
    })

    app.Get("/", func(c fiber.Ctx) error {
        return c.SendString("Hello, World!")
    })

    log.Fatal(app.Listen(":3000"))
}

Testing with curl

curl -i http://localhost:3000/

Example response header:

Server-Timing: app;dur=2001.23

References