Subdomain

This recipe routes requests to separate Echo instances based on the request host, so each subdomain has its own routes and middleware. The instances are combined with echo.NewVirtualHostHandler, which dispatches by host name.

Server

package main

import (
  "context"
  "net/http"

  "github.com/labstack/echo/v5"
  "github.com/labstack/echo/v5/middleware"
)

func main() {
  // Hosts
  vHosts := make(map[string]*echo.Echo)

  //-----
  // API
  //-----

  api := echo.New()
  api.Use(middleware.RequestLogger())
  api.Use(middleware.Recover())

  vHosts["api.localhost:1323"] = api

  api.GET("/", func(c *echo.Context) error {
    return c.String(http.StatusOK, "API")
  })

  //------
  // Blog
  //------

  blog := echo.New()
  blog.Use(middleware.RequestLogger())
  blog.Use(middleware.Recover())

  vHosts["blog.localhost:1323"] = blog

  blog.GET("/", func(c *echo.Context) error {
    return c.String(http.StatusOK, "Blog")
  })

  //---------
  // Website
  //---------

  site := echo.New()
  site.Use(middleware.RequestLogger())
  site.Use(middleware.Recover())

  vHosts["localhost:1323"] = site

  site.GET("/", func(c *echo.Context) error {
    return c.String(http.StatusOK, "Website")
  })

  e := echo.NewVirtualHostHandler(vHosts)

  sc := echo.StartConfig{Address: ":1323"}
  if err := sc.Start(context.Background(), e); err != nil {
    e.Logger.Error("failed to start server", "error", err)
  }
}