🤗 [Question]: How to log a custom header

[kirankumar-grootan]

Question Description

I want to log a custom header x-request-id in fiber access log using fiberzerolog. but the value is empty when shown in the console.

curl -X GET http://localhost:3000 -H "X-Request-Id: abc123"

Code Snippet (optional)

package main

import (
	"os"
	"time"

	"github.com/gofiber/fiber/v2"
	"github.com/rs/zerolog"
)

func main() {
	// Initialize the logger
	loggger := zerolog.New(os.Stderr).
		With().
		Timestamp().
		Logger().
		Output(zerolog.ConsoleWriter{
			Out: os.Stderr,
			TimeLocation: time.UTC,
			TimeFormat: "02-Jan-2006 15:04:05",
			}).
		Level(zerolog.DebugLevel)

	// Create a new Fiber app
	app := fiber.New()


	app.Use(fiberzerolog.New(fiberzerolog.Config{
	Logger:   &loggger,
	Fields:   []string{"referer", "ip", "ips", "method", "url", "ua", "latency", "status", "bytesSent", "bytesReceived", "route", "error", "reqHeader:X-Request-Id"},
	SkipURIs: []string{"/internal/metrics", "/internal/health/live", "/internal/health/ready", "/internal/health/startup"},
	}))


	// Define a route
	app.Get("/", func(c *fiber.Ctx) error {
		// Use Fiber's Locals to set custom context values
		c.Locals("test", "test")

		// create logger with subsystem for each modules and utilize it in the functons
		// https://gitlab.grootan.com/qlikverify/development/ezto-gateway/-/blob/master/lib/middleware/logger.go?ref_type=heads
		// Retrieve and log the value from the context
		value := c.Locals("test")
		loggger.Info().Msgf("Retrieved value from context: %s", value)

		// Respond to the client
		return c.SendString("Hello, World!")
	})

	// Start the server
	if err := app.Listen(":3000"); err != nil {
		loggger.Fatal().Err(err).Msg("Fiber app error")
	}
}

Checklist:

• I agree to follow Fiber's Code of Conduct.
• I have checked for existing issues that describe my questions prior to opening this one.
• I understand that improperly formatted questions may be closed without explanation.

[ReneWerner87]

the functionality to log individual headers does not yet exist in our zerolog middleware

this would have to be added first

https://github.com/gofiber/contrib/blob/main/fiberzerolog/config.go#L12-L34

[kirankumar-grootan]

@ReneWerner87 thanks. the middlware already support request id but it need the requestid middleware to work. passing just the request id header is not working

the above code works.

app.Use(requestid.New())
app.Use(fiberzerolog.New(fiberzerolog.Config{
	Logger:          &logger.Logger,
	FieldsSnakeCase: true,
	Fields:          []string{"referer", "ip", "ips", "method", "url", "ua", "latency", "status", "bytesSent", "bytesReceived", "route", "error", "requestId"},
	SkipURIs:        []string{"/internal/metrics", "/internal/health/live", "/internal/health/ready", "/internal/health/startup"},
}))