First, you need to create the skeleton for your new App Engine application.

At the end of this section, your working directory should look like this:

google_appengine/
goplus/
    app.yaml
    hello.go

1. Download and unzip the Go App Engine SDK
2. Install Mercurial
3. Create a new directory named goplus in your working directory. This directory will contain your App Engine application files.
4. Inside the goplus directory, create a file named app.yaml with the following contents. This file contains your App Engine application configuration.

   application: goplus
   version: 1
   runtime: go
   api_version: go1
   
   handlers:
     - url: /.*
       script: _go_app
   

5. Inside the goplus directory, create a file named hello.go with the following contents:

   package goplus
   
   import (
   	"fmt"
   	"net/http"
   )
   
   // init is called before the application starts.
   func init() {
   	// Register a handler for /hello URLs.
   	http.HandleFunc("/", hello)
   }
   
   // hello is an HTTP handler that prints "Hello Gopher!"
   func hello(w http.ResponseWriter, r *http.Request) {
   	fmt.Fprint(w, "Hello, Gopher!")
   }
   
   

6. Start the development server by running dev_appserver.py (located in the google_appengine directory) on the command line, with the directory of your application as its first argument.

   /path/to/google_appengine/dev_appserver.py goplus
   

   You can use the -a 0.0.0.0 option to bind the development server to all your available IP addresses.
7. Open http://localhost:8080 in your browser.

You should see: Hello Gopher!

Next step: Hello Google+