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echo/website/docs/recipes/subdomains.md

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## Subdomains
`server.go`
```go
package main
import (
"net/http"
"github.com/labstack/echo"
mw "github.com/labstack/echo/middleware"
)
type Hosts map[string]http.Handler
func (h Hosts) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if handler := h[r.Host]; handler != nil {
handler.ServeHTTP(w, r)
} else {
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
}
}
func main() {
// Host map
hosts := make(Hosts)
//-----
// API
//-----
api := echo.New()
api.Use(mw.Logger())
api.Use(mw.Recover())
hosts["api.localhost:1323"] = api
api.Get("/", func(c *echo.Context) error {
return c.String(http.StatusOK, "API")
})
//------
// Blog
//------
blog := echo.New()
blog.Use(mw.Logger())
blog.Use(mw.Recover())
hosts["blog.localhost:1323"] = blog
blog.Get("/", func(c *echo.Context) error {
return c.String(http.StatusOK, "Blog")
})
//---------
// Website
//---------
site := echo.New()
site.Use(mw.Logger())
site.Use(mw.Recover())
hosts["localhost:1323"] = site
site.Get("/", func(c *echo.Context) error {
return c.String(http.StatusOK, "Welcome!")
})
http.ListenAndServe(":1323", hosts)
}
```
## [Source Code](https://github.com/labstack/echo/blob/master/recipes/subdomains)