echo framework header based versioning

main.go

package main

import (
	"net/http"
	"fmt"
	"github.com/labstack/echo"
)

func main() {
	e := echo.New()
	e.Pre(APIVersion);
	e.GET("v1/todo", func(c echo.Context) error {
		return c.String(http.StatusOK, "TODO v1")
	})
	e.GET("v2/todo", func(c echo.Context) error {
		return c.String(http.StatusOK, "TODO v2")
	})
	e.Logger.Fatal(e.Start(":1324"))
}

// APIVersion Header Based Versioning
func APIVersion(next echo.HandlerFunc) echo.HandlerFunc {
	return func(c echo.Context) error {
		req := c.Request()
		headers := req.Header

		apiVersion:= headers.Get("version")

		req.URL.Path = fmt.Sprintf("/%s%s",apiVersion, req.URL.Path)

		return next(c)
	}
}