Go AppEngine Post

app.yml

application: your-app-name
version: 1
runtime: go
api_version: go1

handlers:
  - url: /.*
    script: _go_app

example.go

context := appengine.NewContext(r)
sg.Client = urlfetch.Client(context)

main.go

package demo

import (
	"appengine"
	"appengine/urlfetch"
	"github.com/go-martini/martini"
	"github.com/sendgrid/sendgrid-go"
	"net/http"
)

func init() {
	sg := sendgrid.NewSendGridClient("SENDGRID_USERNAME", "SENDGRID_PASSWORD")

	m := martini.Classic()

	m.Get("/:email", func(r *http.Request, params martini.Params) string {
		context := appengine.NewContext(r)
		sg.Client = urlfetch.Client(context)
		email := sendgrid.NewMail()
		email.AddTo(params["email"])
		email.SetSubject("Hello!")
		email.SetText("This was sent from your sample app!")
		email.SetFrom("yamil@sendgrid.com")
		email.SetFromName("Yamil @elbuo8")
		if e := sg.Send(email); e == nil {
			return "Sent!"
		} else {
			context.Infof("%v", e)
			return "Oups"
		}
	})
	http.Handle("/", m)
}