HTTP Echo GET

---

examples/http-echo-get/http_echo_get.go

package main

import (
    "fmt"
    "log"
    "net/http"
)

func mainPage(w http.ResponseWriter, r *http.Request) {
    text := r.FormValue("text")
    html := `<h1>Echo</h1><form><input type name="text"><input type="submit" value="Echo"></form>`

    if text != "" {
        html += fmt.Sprintf("You said: %v", text)
    }
    fmt.Fprintf(w, html)
}

func main() {
    http.HandleFunc("/", mainPage)
    host := "127.0.0.1"
    port := 5000
    fmt.Printf("Going to listen on http://%v:%v  Ctr-c to stop the server.\n", host, port)
    err := http.ListenAndServe(fmt.Sprintf("%v:%v", host, port), nil)
    if err != nil {
        log.Fatal(err)
    }
}