Fix

Modified ping path and added a comment explaining why init() is called
like that.

examples/app-engine/hello.go

@@ -5,6 +5,7 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
+// This function's name is a must. App Engine uses it to drive the requests properly.
 func init() {
 	// Starts a new Gin instance with no middle-ware
 	r := gin.New()
@@ -13,7 +14,7 @@ func init() {
 	r.GET("/", func(c *gin.Context){
 		c.String(200, "Hello World!")
 	})
-	r.GET("/ping/", func(c *gin.Context){
+	r.GET("/ping", func(c *gin.Context){
 		c.String(200, "pong")
 	})