diff --git a/.gitignore b/.gitignore
index d87d4be..2de3904 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,4 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
+.idea
diff --git a/lib/prerender_rails.rb b/lib/prerender_rails.rb
index c5f138f..e24e179 100644
--- a/lib/prerender_rails.rb
+++ b/lib/prerender_rails.rb
@@ -34,7 +34,10 @@ def initialize(app, options={})
         'nuzzel',
         'Discordbot',
         'Google Page Speed',
-        'Qwantify'
+        'Qwantify',
+        #'Chrome-Lighthouse', # Removed to test Web Vitals without prerendering
+        'SemrushBot',
+        'AhrefsSiteAudit'
       ]
 
       @extensions_to_ignore = [
@@ -105,7 +108,7 @@ def call(env)
         prerendered_response = get_prerendered_page_response(env,use_second_service)
 
         if prerendered_response
-          response = build_rack_response_from_prerender(prerendered_response)
+          response = build_rack_response_from_prerender(prerendered_response, env)
           after_render(env, prerendered_response)
           return response.finish
         end
@@ -221,10 +224,14 @@ def get_prerender_service_url use_second_service
     end
 
 
-    def build_rack_response_from_prerender(prerendered_response)
-      response = Rack::Response.new(prerendered_response.body, prerendered_response.code, prerendered_response.header)
+    def build_rack_response_from_prerender(prerendered_response, env)
+      header = prerendered_response.header
 
-      @options[:build_rack_response_from_prerender].call(response, prerendered_response) if @options[:build_rack_response_from_prerender]
+      header['Content-Length'] = prerendered_response.body.length
+
+      response = Rack::Response.new(prerendered_response.body, prerendered_response.code, header)
+
+      @options[:build_rack_response_from_prerender].call(response, prerendered_response, env) if @options[:build_rack_response_from_prerender]
 
       response
     end