Added a ping keepalive endpoint.

bridge/api/api.go

@@ -39,6 +39,7 @@ func New(cfg *bridge.Config) bridge.Bridger {
 			return key == b.GetString("Token"), nil
 		}))
 	}
+	e.GET("/api/ping", b.handlePing)
 	e.GET("/api/messages", b.handleMessages)
 	e.GET("/api/stream", b.handleStream)
 	e.POST("/api/message", b.handlePostMessage)
@@ -75,6 +76,10 @@ func (b *Api) Send(msg config.Message) (string, error) {
 	return "", nil
 }
 
+func (b *Api) handlePing(c echo.Context) error {
+	return c.String(http.StatusOK, "pong")
+}
+
 func (b *Api) handlePostMessage(c echo.Context) error {
 	message := config.Message{}
 	if err := c.Bind(&message); err != nil {