diff --git a/lib/unleash/configuration.rb b/lib/unleash/configuration.rb
index c47d0a9b..20137c68 100644
--- a/lib/unleash/configuration.rb
+++ b/lib/unleash/configuration.rb
@@ -54,6 +54,9 @@ def http_headers
         'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
         'UNLEASH-INSTANCEID' => self.instance_id,
         'UNLEASH-APPNAME' => self.app_name,
+        'X-UNLEASH-APPNAME' => self.app_name,
+        'X-UNLEASH-CONNECTION-ID' => @connection_id,
+        'X-UNLEASH-SDK' => "unleash-ruby@#{Unleash::VERSION}",
         'Unleash-Client-Spec' => CLIENT_SPECIFICATION_VERSION
       }.merge!(generate_custom_http_headers)
     end
@@ -87,6 +90,7 @@ def set_defaults
       self.environment      = 'default'
       self.url              = nil
       self.instance_id      = SecureRandom.uuid
+      @connection_id        = SecureRandom.uuid
       self.project_name     = nil
       self.disable_client   = false
       self.disable_metrics  = false
diff --git a/spec/unleash/client_spec.rb b/spec/unleash/client_spec.rb
index 31eaa8fd..02b489c0 100644
--- a/spec/unleash/client_spec.rb
+++ b/spec/unleash/client_spec.rb
@@ -1,3 +1,5 @@
+require "securerandom"
+
 RSpec.describe Unleash::Client do
   after do
     WebMock.reset!
@@ -5,6 +7,9 @@
   end
 
   it "Uses custom http headers when initializing client" do
+    fixed_uuid = "123e4567-e89b-12d3-a456-426614174000"
+    allow(SecureRandom).to receive(:uuid).and_return(fixed_uuid)
+
     WebMock.stub_request(:post, "http://test-url/client/register")
       .with(
         headers: {
@@ -12,6 +17,7 @@
           'Content-Type' => 'application/json',
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
           'X-Api-Key' => '123'
         }
       )
@@ -22,7 +28,8 @@
           'Accept' => '*/*',
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'Content-Type' => 'application/json',
-          'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]"
+          'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}"
         }
       )
       .to_return(status: 200, body: "", headers: {})
@@ -45,8 +52,11 @@
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'Content-Type' => 'application/json',
           'Unleash-Appname' => 'my-test-app',
+          'X-Unleash-Appname' => 'my-test-app',
           'Unleash-Instanceid' => 'rspec/test',
+          'X-Unleash-Connection-Id' => fixed_uuid,
           'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
           'X-Api-Key' => '123'
         }
       )
@@ -73,14 +83,18 @@
       .with(headers: { 'Content-Type': 'application/json' })
       .with(headers: { 'X-API-KEY': '123', 'Content-Type': 'application/json' })
       .with(headers: { 'UNLEASH-APPNAME': 'my-test-app' })
+      .with(headers: { 'X-UNLEASH-APPNAME': 'my-test-app' })
       .with(headers: { 'UNLEASH-INSTANCEID': 'rspec/test' })
+      .with(headers: { 'X-UNLEASH-CONNECTION-ID': fixed_uuid })
     ).to have_been_made.once
 
     expect(
       a_request(:get, "http://test-url/client/features")
       .with(headers: { 'X-API-KEY': '123' })
       .with(headers: { 'UNLEASH-APPNAME': 'my-test-app' })
+      .with(headers: { 'X-UNLEASH-APPNAME': 'my-test-app' })
       .with(headers: { 'UNLEASH-INSTANCEID': 'rspec/test' })
+      .with(headers: { 'X-UNLEASH-CONNECTION-ID': fixed_uuid })
     ).to have_been_made.once
 
     # Test now sending of metrics
@@ -91,7 +105,9 @@
         .with(headers: { 'Content-Type': 'application/json' })
         .with(headers: { 'X-API-KEY': '123', 'Content-Type': 'application/json' })
         .with(headers: { 'UNLEASH-APPNAME': 'my-test-app' })
+        .with(headers: { 'X-UNLEASH-APPNAME': 'my-test-app' })
         .with(headers: { 'UNLEASH-INSTANCEID': 'rspec/test' })
+        .with(headers: { 'X-UNLEASH-CONNECTION-ID': fixed_uuid })
     ).not_to have_been_made
 
     # Sending metrics, if they have been evaluated:
@@ -103,7 +119,9 @@
       .with(headers: { 'Content-Type': 'application/json' })
       .with(headers: { 'X-API-KEY': '123', 'Content-Type': 'application/json' })
       .with(headers: { 'UNLEASH-APPNAME': 'my-test-app' })
+      .with(headers: { 'X-UNLEASH-APPNAME': 'my-test-app' })
       .with(headers: { 'UNLEASH-INSTANCEID': 'rspec/test' })
+      .with(headers: { 'X-UNLEASH-CONNECTION-ID': fixed_uuid })
       .with{ |request| JSON.parse(request.body)['bucket']['toggles']['Feature.A']['yes'] == 2 }
     ).to have_been_made.once
   end
@@ -116,8 +134,10 @@
           'Content-Type' => 'application/json',
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'Unleash-Appname' => 'my-test-app',
+          'X-Unleash-Appname' => 'my-test-app',
           'Unleash-Instanceid' => 'rspec/test',
           'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
           'X-Api-Key' => '123'
         }
       )
@@ -157,8 +177,10 @@
           'Content-Type' => 'application/json',
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'Unleash-Appname' => 'my-test-app',
+          'X-Unleash-Appname' => 'my-test-app',
           'Unleash-Instanceid' => 'rspec/test',
           'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
           'X-Api-Key' => '123'
         }
       )
@@ -257,6 +279,7 @@
           'Content-Type' => 'application/json',
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
           'X-Api-Key' => '123'
         }
       )
@@ -269,8 +292,10 @@
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'Content-Type' => 'application/json',
           'Unleash-Appname' => 'my-test-app',
+          'X-Unleash-Appname' => 'my-test-app',
           'Unleash-Instanceid' => 'rspec/test',
           'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
           'X-Api-Key' => '123'
         }
       )
@@ -305,6 +330,7 @@
           'Content-Type' => 'application/json',
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
           'X-Api-Key' => '123'
         }
       )
@@ -327,8 +353,10 @@
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'Content-Type' => 'application/json',
           'Unleash-Appname' => 'my-test-app',
+          'X-Unleash-Appname' => 'my-test-app',
           'Unleash-Instanceid' => 'rspec/test',
           'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
           'X-Api-Key' => '123'
         }
       )
@@ -605,8 +633,10 @@
             'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
             'Content-Type' => 'application/json',
             'Unleash-Appname' => 'my-test-app',
+            'X-Unleash-Appname' => 'my-test-app',
             'Unleash-Instanceid' => 'rspec/test',
             'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+            'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
             'X-Api-Key' => '123'
           }
         )
@@ -619,8 +649,10 @@
             'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
             'Content-Type' => 'application/json',
             'Unleash-Appname' => 'my-test-app',
+            'X-Unleash-Appname' => 'my-test-app',
             'Unleash-Instanceid' => 'rspec/test',
             'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+            'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}",
             'X-Api-Key' => '123'
           }
         )
diff --git a/spec/unleash/configuration_spec.rb b/spec/unleash/configuration_spec.rb
index 1a2ce4c6..2aaeb973 100644
--- a/spec/unleash/configuration_spec.rb
+++ b/spec/unleash/configuration_spec.rb
@@ -1,4 +1,5 @@
 require "unleash/configuration"
+require "securerandom"
 
 RSpec.describe Unleash do
   describe 'Configuration' do
@@ -124,7 +125,9 @@
       expect{ config.validate! }.not_to raise_error
       expect(config.custom_http_headers).to include({ 'X-API-KEY': '123' })
       expect(config.http_headers).to include({ 'UNLEASH-APPNAME' => 'test-app' })
+      expect(config.http_headers).to include({ 'X-UNLEASH-APPNAME' => 'test-app' })
       expect(config.http_headers).to include('UNLEASH-INSTANCEID')
+      expect(config.http_headers).to include('X-UNLEASH-CONNECTION-ID')
     end
 
     it "should allow lambdas and procs for custom_https_headers via new client" do
@@ -133,6 +136,9 @@
       end
       allow(custom_headers_proc).to receive(:call).and_call_original
 
+      fixed_uuid = "123e4567-e89b-12d3-a456-426614174000"
+      allow(SecureRandom).to receive(:uuid).and_return(fixed_uuid)
+
       config = Unleash::Configuration.new(
         url: 'https://testurl/api',
         app_name: 'test-app',
@@ -145,7 +151,10 @@
         {
           'X-API-KEY' => '123',
           'UNLEASH-APPNAME' => 'test-app',
+          'X-UNLEASH-APPNAME' => 'test-app',
           'UNLEASH-INSTANCEID' => config.instance_id,
+          'X-UNLEASH-CONNECTION-ID' => fixed_uuid,
+          'X-UNLEASH-SDK' => "unleash-ruby@#{Unleash::VERSION}",
           'Unleash-Client-Spec' => '5.1.9',
           'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]"
         }
diff --git a/spec/unleash/metrics_reporter_spec.rb b/spec/unleash/metrics_reporter_spec.rb
index 7c08e14e..9ba946ae 100644
--- a/spec/unleash/metrics_reporter_spec.rb
+++ b/spec/unleash/metrics_reporter_spec.rb
@@ -69,8 +69,10 @@
           'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
           'Content-Type' => 'application/json',
           'Unleash-Appname' => 'my-test-app',
+          'X-Unleash-Appname' => 'my-test-app',
           'Unleash-Instanceid' => 'rspec/test',
-          'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]"
+          'User-Agent' => "UnleashClientRuby/#{Unleash::VERSION} #{RUBY_ENGINE}/#{RUBY_VERSION} [#{RUBY_PLATFORM}]",
+          'X-Unleash-Sdk' => "unleash-ruby@#{Unleash::VERSION}"
         }
       )
       .to_return(status: 200, body: "", headers: {})