Added retrying

lib/api/app.rb

@@ -1,15 +1,32 @@
 require 'json'
 require 'sinatra/base'
+require 'sinatra/custom_logger'
 require_relative '../http/query'
+require_relative '../exceptions'
 
 module Pruning
   module API
     class App < Sinatra::Base
       before { content_type :json }
       after  { serialise_response }
+      set :show_exceptions, true
+      
+
+      error Pruning::Exceptions::UnexpectedError do 
+        status 500
+      end
+
+      error Pruning::Exceptions::OriginCannotFindTheResource do
+        status 404     
+      end
+
+
+      get '/' do
+        "Try /tree/:name"
+      end
+
 
       private
-
       def serialise_response
         return unless content_type == 'application/json'
         response.body = [JSON(response.body)]