JSON why do you kill my performance? Oh yeah...

Gemfile

@@ -3,6 +3,7 @@ source "http://rubygems.org"
 
 gem "qtbindings"
 gem 'htmlentities'
+gem 'rest-client'
+
+# only needed for testing
 gem 'mocha'
-gem 'json_pure'
-gem 'rest-client'

Gemfile.lock

@@ -2,7 +2,6 @@ GEM
   remote: http://rubygems.org/
   specs:
     htmlentities (4.2.3)
-    json_pure (1.5.1)
     mime-types (1.16)
     mocha (0.9.10)
       rake
@@ -16,7 +15,6 @@ PLATFORMS
 
 DEPENDENCIES
   htmlentities
-  json_pure
   mocha
   qtbindings
   rest-client

app/widgets/server.rb

@@ -1,5 +1,4 @@
 require 'uri'
-require 'json/pure'
 
 # http server listening on port 8080 to do the inter-process communication
 class KidsRubyServer < Qt::TcpServer
@@ -86,8 +85,7 @@ def connection
           @parent.append(param)
           connection.write validResponse("OK")
         elsif command == "appendError"
-          body.each_line {|l| @parent.appendError( JSON.parse(l)['error'] )}
-          #@parent.appendError(body)
+          @parent.appendError(body)
           connection.write validResponse("OK")
         elsif command == "gets"
           connection.write validResponse(@parent.gets)          

lib/kidsruby/interface.rb

@@ -1,6 +1,5 @@
 require "uri"
 require "rest_client"
-require 'json/pure'
 
 class InterfaceHelper
   def connect!
@@ -34,7 +33,7 @@ def call(method, param = nil)
       loc = loc + "?#{URI.escape(param)}"
       return Reply.new(RestClient.get(loc))
     elsif param && param.is_a?(Hash)
-      return Reply.new(RestClient.post(loc, JSON.generate(param), :content_type => :json, :accept => :json))
+      return Reply.new(RestClient.post(loc, param['data'], :content_type => 'text/plain'))
     else
       return Reply.new(RestClient.get(loc))
     end

lib/kidsruby/stdio.rb

@@ -14,9 +14,7 @@ def write(data)
 
 class StdErr < KidsRubyStdIo
   def write(data)
-    #t = data.gsub(/\n/,"<br/>")
-    @payload = {'error' => data}
-    @iface.call("appendError", @payload)
+    @iface.call("appendError", {'data' => data})
   end
   alias_method :puts, :write
 end