add the ability to ignore certain urls that may match

README.md

@@ -25,7 +25,8 @@ MyApp::Application.configure do
     :min_delay => 500,
     :max_delay => 10000,
     :port => 56789,
-    :host => 'myhost.cool.wow'
+    :host => 'myhost.cool.wow',
+    :ignore => [ %r{dont/modify\.html$} ]
   )
 end
 ```

lib/rack/livereload.rb

@@ -48,6 +48,7 @@ module Rack
       else
         status, headers, body = @app.call(env)
 
+        if !@options[:ignore] || !@options[:ignore].any? { |filter| path[filter] }
           case headers['Content-Type']
           when %r{text/html}
             content_length = 0
@@ -78,6 +79,7 @@ module Rack
 
             headers['Content-Length'] = content_length.to_s
           end
+        end
 
         [ status, headers, body ]
       end

spec/rack/livereload_spec.rb

@@ -132,6 +132,15 @@ describe Rack::LiveReload do
         body.should include('localhost')
       end
     end
+
+    context 'ignored' do
+      let(:options) { { :ignore => [ %r{file} ] } }
+      let(:env) { { 'PATH_INFO' => 'this/file' } }
+
+      it 'should have no change' do
+        body.should_not include('script')
+      end
+    end
   end
 
   context '/__rack/livereload.js' do