From 0165dee6159fa924c9a71186ee41fe0b982c38b0 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 06:14:58 -0500
Subject: [PATCH 01/21] [FSSDK-11459] Ruby - Add SDK Multi-Region Support for
 Data Hosting

---
 .../config/datafile_project_config.rb         |  3 +-
 lib/optimizely/event/event_factory.rb         |  9 ++-
 lib/optimizely/event/user_event_factory.rb    |  2 +
 lib/optimizely/event_builder.rb               | 11 +++-
 lib/optimizely/project_config.rb              |  2 +
 spec/config/datafile_project_config_spec.rb   | 18 ++++++
 spec/event/event_factory_spec.rb              | 59 +++++++++---------
 spec/event/user_event_factory_spec.rb         |  4 ++
 spec/event_builder_spec.rb                    | 62 ++++++++++---------
 spec/spec_params.rb                           |  1 +
 10 files changed, 111 insertions(+), 60 deletions(-)

diff --git a/lib/optimizely/config/datafile_project_config.rb b/lib/optimizely/config/datafile_project_config.rb
index 1f03171d..44fd0bf0 100644
--- a/lib/optimizely/config/datafile_project_config.rb
+++ b/lib/optimizely/config/datafile_project_config.rb
@@ -32,7 +32,7 @@ class DatafileProjectConfig < ProjectConfig
                 :group_id_map, :rollout_id_map, :rollout_experiment_id_map, :variation_id_map,
                 :variation_id_to_variable_usage_map, :variation_key_map, :variation_id_map_by_experiment_id,
                 :variation_key_map_by_experiment_id, :flag_variation_map, :integration_key_map, :integrations,
-                :public_key_for_odp, :host_for_odp, :all_segments
+                :public_key_for_odp, :host_for_odp, :all_segments, :region
     # Boolean - denotes if Optimizely should remove the last block of visitors' IP address before storing event data
     attr_reader :anonymize_ip
 
@@ -68,6 +68,7 @@ def initialize(datafile, logger, error_handler)
       @rollouts = config.fetch('rollouts', [])
       @send_flag_decisions = config.fetch('sendFlagDecisions', false)
       @integrations = config.fetch('integrations', [])
+      @region = config.fetch('region', 'US')
 
       # Json type is represented in datafile as a subtype of string for the sake of backwards compatibility.
       # Converting it to a first-class json type while creating Project Config
diff --git a/lib/optimizely/event/event_factory.rb b/lib/optimizely/event/event_factory.rb
index 9ac8a937..d8ad5913 100644
--- a/lib/optimizely/event/event_factory.rb
+++ b/lib/optimizely/event/event_factory.rb
@@ -28,7 +28,10 @@ class EventFactory
     # EventFactory builds LogEvent objects from a given user_event.
     class << self
       CUSTOM_ATTRIBUTE_FEATURE_TYPE = 'custom'
-      ENDPOINT = 'https://logx.optimizely.com/v1/events'
+      ENDPOINTS = {
+        US: 'https://logx.optimizely.com/v1/events',
+        EU: 'https://eu.logx.optimizely.com/v1/events'
+      }
       POST_HEADERS = {'Content-Type' => 'application/json'}.freeze
       ACTIVATE_EVENT_KEY = 'campaign_activated'
 
@@ -64,9 +67,13 @@ def create_log_event(user_events, logger)
         builder.with_client_name(user_context[:client_name])
         builder.with_anonymize_ip(user_context[:anonymize_ip])
         builder.with_enrich_decisions(true)
+        builder.with_region(user_context[:region])
 
         builder.with_visitors(visitors)
         event_batch = builder.build
+
+        ENDPOINT = ENDPOINTS[user_context[:region].to_sym] || ENDPOINTS[:US]
+
         Event.new(:post, ENDPOINT, event_batch.as_json, POST_HEADERS)
       end
 
diff --git a/lib/optimizely/event/user_event_factory.rb b/lib/optimizely/event/user_event_factory.rb
index f7852341..872a70b8 100644
--- a/lib/optimizely/event/user_event_factory.rb
+++ b/lib/optimizely/event/user_event_factory.rb
@@ -33,6 +33,7 @@ def self.create_impression_event(project_config, experiment, variation_id, metad
       #
       # Returns Event encapsulating the impression event.
       event_context = Optimizely::EventContext.new(
+        region: project_config.region,
         account_id: project_config.account_id,
         project_id: project_config.project_id,
         anonymize_ip: project_config.anonymize_ip,
@@ -67,6 +68,7 @@ def self.create_conversion_event(project_config, event, user_id, user_attributes
       # Returns Event encapsulating the conversion event.
 
       event_context = Optimizely::EventContext.new(
+        region: project_config.region,
         account_id: project_config.account_id,
         project_id: project_config.project_id,
         anonymize_ip: project_config.anonymize_ip,
diff --git a/lib/optimizely/event_builder.rb b/lib/optimizely/event_builder.rb
index 4c743cc3..7396d1da 100644
--- a/lib/optimizely/event_builder.rb
+++ b/lib/optimizely/event_builder.rb
@@ -107,7 +107,10 @@ def get_common_params(project_config, user_id, attributes)
   end
 
   class EventBuilder < BaseEventBuilder
-    ENDPOINT = 'https://logx.optimizely.com/v1/events'
+    ENDPOINTS = {
+      US: 'https://logx.optimizely.com/v1/events',
+      EU: 'https://eu.logx.optimizely.com/v1/events'
+    }
     POST_HEADERS = {'Content-Type' => 'application/json'}.freeze
     ACTIVATE_EVENT_KEY = 'campaign_activated'
 
@@ -122,10 +125,13 @@ def create_impression_event(project_config, experiment, variation_id, user_id, a
       #
       # Returns +Event+ encapsulating the impression event.
 
+      region = project_config.region || 'US'
       event_params = get_common_params(project_config, user_id, attributes)
       impression_params = get_impression_params(project_config, experiment, variation_id)
       event_params[:visitors][0][:snapshots].push(impression_params)
 
+      ENDPOINT = ENDPOINTS[region]
+
       Event.new(:post, ENDPOINT, event_params, POST_HEADERS)
     end
 
@@ -140,10 +146,13 @@ def create_conversion_event(project_config, event, user_id, attributes, event_ta
       #
       # Returns +Event+ encapsulating the conversion event.
 
+      region = project_config.region || 'US'
       event_params = get_common_params(project_config, user_id, attributes)
       conversion_params = get_conversion_params(event, event_tags)
       event_params[:visitors][0][:snapshots] = [conversion_params]
 
+      ENDPOINT = ENDPOINTS[region]
+
       Event.new(:post, ENDPOINT, event_params, POST_HEADERS)
     end
 
diff --git a/lib/optimizely/project_config.rb b/lib/optimizely/project_config.rb
index 43e86441..b5094b62 100644
--- a/lib/optimizely/project_config.rb
+++ b/lib/optimizely/project_config.rb
@@ -62,6 +62,8 @@ def host_for_odp; end
 
     def all_segments; end
 
+    def region; end
+
     def experiment_running?(experiment); end
 
     def get_experiment_from_key(experiment_key); end
diff --git a/spec/config/datafile_project_config_spec.rb b/spec/config/datafile_project_config_spec.rb
index 362141d6..05b90a5f 100644
--- a/spec/config/datafile_project_config_spec.rb
+++ b/spec/config/datafile_project_config_spec.rb
@@ -57,6 +57,7 @@
       expect(project_config.sdk_key).to eq(config_body['sdkKey'])
       expect(project_config.environment_key).to eq(config_body['environmentKey'])
       expect(project_config.send_flag_decisions).to eq(config_body['sendFlagDecisions'])
+      expect(project_config.region).to eq(config_body['region'])
 
       expected_attribute_key_map = {
         'browser_type' => config_body['attributes'][0],
@@ -756,6 +757,23 @@
       expect(project_config.rollout_experiment_id_map).to eq(expected_rollout_experiment_id_map)
     end
 
+    it 'should use US region when no region is specified in datafile' do
+      project_config = Optimizely::DatafileProjectConfig.new(config_body_JSON, logger, error_handler)
+      expect(project_config.region).to eq('US')
+    end
+
+    it 'should parse region specified in datafile correctly' do
+      project_configUS = Optimizely::DatafileProjectConfig.new(config_body_JSON, logger, error_handler)
+      expect(project_config.region).to eq('US')
+
+      config_bodyEU = config_body.dup
+      config_bodyEU['region'] = 'EU'
+      config_body_JSON = JSON.dump(config_bodyEU)
+      project_configEU = Optimizely::DatafileProjectConfig.new(config_body_JSON, logger, error_handler)
+
+      expect(project_config.region).to eq('EU')
+    end
+
     it 'should initialize properties correctly upon creating project with typed audience dict' do
       project_config = Optimizely::DatafileProjectConfig.new(JSON.dump(OptimizelySpec::CONFIG_DICT_WITH_TYPED_AUDIENCES), logger, error_handler)
       config_body = OptimizelySpec::CONFIG_DICT_WITH_TYPED_AUDIENCES
diff --git a/spec/event/event_factory_spec.rb b/spec/event/event_factory_spec.rb
index b92661be..00492ba0 100644
--- a/spec/event/event_factory_spec.rb
+++ b/spec/event/event_factory_spec.rb
@@ -34,7 +34,10 @@
     allow(Time).to receive(:now).and_return(time_now)
     allow(SecureRandom).to receive(:uuid).and_return('a68cf1ad-0393-4e18-af87-efe8f01a7c9c')
 
-    @expected_endpoint = 'https://logx.optimizely.com/v1/events'
+    @expected_endpoints[:US] = {
+      US: 'https://logx.optimizely.com/v1/events',
+      EU: 'https://eu.logx.optimizely.com/v1/events'
+    }
     @expected_impression_params = {
       account_id: '12001',
       project_id: '111001',
@@ -111,7 +114,7 @@
     impression_event = Optimizely::UserEventFactory.create_impression_event(project_config, experiment, '111128', metadata, 'test_user', nil)
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -134,7 +137,7 @@
                                                                             'browser_type' => 'firefox')
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -184,7 +187,7 @@
     impression_event = Optimizely::UserEventFactory.create_impression_event(project_config, experiment, '111128', metadata, 'test_user', attributes)
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -225,7 +228,7 @@
     impression_event = Optimizely::UserEventFactory.create_impression_event(project_config, experiment, '111128', metadata, 'test_user', attributes)
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -248,7 +251,7 @@
                                                                             'browser_type' => false)
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -270,7 +273,7 @@
     impression_event = Optimizely::UserEventFactory.create_impression_event(project_config, experiment, '111128', metadata, 'test_user', 'browser_type' => 0)
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -286,7 +289,7 @@
                                                                             invalid_attribute: 'sorry_not_sorry')
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -294,7 +297,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, nil)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -309,7 +312,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', {'browser_type' => 'firefox'}, nil)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -322,7 +325,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -335,7 +338,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -347,7 +350,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -359,7 +362,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -375,7 +378,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -390,7 +393,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -404,7 +407,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -418,7 +421,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -432,7 +435,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -447,7 +450,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -461,7 +464,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', nil, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -487,7 +490,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', {'browser_type' => 'firefox'}, event_tags)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -520,7 +523,7 @@
     impression_event = Optimizely::UserEventFactory.create_impression_event(project_config, experiment, '111128', metadata, 'test_user', user_attributes)
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -556,7 +559,7 @@
     impression_event = Optimizely::UserEventFactory.create_impression_event(project_config, experiment, '111128', metadata, 'test_user', user_attributes)
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -594,7 +597,7 @@
     )
     log_event = Optimizely::EventFactory.create_log_event(impression_event, spy_logger)
     expect(log_event.params).to eq(@expected_impression_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -620,7 +623,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', user_attributes, nil)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -642,7 +645,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', user_attributes, nil)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 
@@ -671,7 +674,7 @@
     conversion_event = Optimizely::UserEventFactory.create_conversion_event(project_config, event, 'test_user', user_attributes, nil)
     log_event = Optimizely::EventFactory.create_log_event(conversion_event, spy_logger)
     expect(log_event.params).to eq(@expected_conversion_params)
-    expect(log_event.url).to eq(@expected_endpoint)
+    expect(log_event.url).to eq(@expected_endpoints[:US])
     expect(log_event.http_verb).to eq(:post)
   end
 end
diff --git a/spec/event/user_event_factory_spec.rb b/spec/event/user_event_factory_spec.rb
index f9876c23..53f678f1 100644
--- a/spec/event/user_event_factory_spec.rb
+++ b/spec/event/user_event_factory_spec.rb
@@ -46,6 +46,7 @@
       expect(impression_event.event_context[:project_id]).to eq(project_config.project_id)
       expect(impression_event.event_context[:revision]).to eq(project_config.revision)
       expect(impression_event.event_context[:anonymize_ip]).to eq(project_config.anonymize_ip)
+      expect(impression_event.event_context[:region]).to eq(project_config.region)
       expect(impression_event.bot_filtering).to eq(project_config.bot_filtering)
       expect(impression_event.experiment_id).to eq(experiment['id'])
       expect(impression_event.variation_id).to eq('111128')
@@ -79,6 +80,7 @@
       expect(impression_event.event_context[:project_id]).to eq(project_config.project_id)
       expect(impression_event.event_context[:revision]).to eq(project_config.revision)
       expect(impression_event.event_context[:anonymize_ip]).to eq(project_config.anonymize_ip)
+      expect(impression_event.event_context[:region]).to eq(project_config.region)
       expect(impression_event.bot_filtering).to eq(project_config.bot_filtering)
       expect(impression_event.experiment_id).to eq(experiment['id'])
       expect(impression_event.variation_id).to eq('111128')
@@ -108,6 +110,7 @@
       expect(conversion_event.event_context[:project_id]).to eq(project_config.project_id)
       expect(conversion_event.event_context[:revision]).to eq(project_config.revision)
       expect(conversion_event.event_context[:anonymize_ip]).to eq(project_config.anonymize_ip)
+      expect(impression_event.event_context[:region]).to eq(project_config.region)
       expect(conversion_event.event['key']).to eq(event['key'])
       expect(conversion_event.bot_filtering).to eq(project_config.bot_filtering)
       expect(conversion_event.user_id).to eq('test_user')
@@ -141,6 +144,7 @@
       expect(conversion_event.event_context[:project_id]).to eq(project_config.project_id)
       expect(conversion_event.event_context[:revision]).to eq(project_config.revision)
       expect(conversion_event.event_context[:anonymize_ip]).to eq(project_config.anonymize_ip)
+      expect(impression_event.event_context[:region]).to eq(project_config.region)
       expect(conversion_event.event['key']).to eq(event['key'])
       expect(conversion_event.bot_filtering).to eq(project_config.bot_filtering)
       expect(conversion_event.user_id).to eq('test_user')
diff --git a/spec/event_builder_spec.rb b/spec/event_builder_spec.rb
index 4201c579..9efdbb81 100644
--- a/spec/event_builder_spec.rb
+++ b/spec/event_builder_spec.rb
@@ -39,7 +39,10 @@
     allow(Time).to receive(:now).and_return(time_now)
     allow(SecureRandom).to receive(:uuid).and_return('a68cf1ad-0393-4e18-af87-efe8f01a7c9c')
 
-    @expected_endpoint = 'https://logx.optimizely.com/v1/events'
+    @expected_endpoints = {
+      US: 'https://logx.optimizely.com/v1/events',
+      EU: 'https://eu.logx.optimizely.com/v1/events'
+    }
     @expected_impression_params = {
       account_id: '12001',
       project_id: '111001',
@@ -95,7 +98,8 @@
       revision: '42',
       client_name: Optimizely::CLIENT_ENGINE,
       enrich_decisions: true,
-      client_version: Optimizely::VERSION
+      client_version: Optimizely::VERSION,
+      region: 'US'
     }
   end
 
@@ -103,7 +107,7 @@
     experiment = config.get_experiment_from_key('test_experiment')
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user', nil)
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
@@ -119,7 +123,7 @@
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user',
                                                               'browser_type' => 'firefox')
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
@@ -161,7 +165,7 @@
     }
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user', attributes)
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
@@ -194,7 +198,7 @@
     }
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user', attributes)
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
@@ -210,7 +214,7 @@
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user',
                                                               'browser_type' => false)
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoins[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
@@ -225,7 +229,7 @@
     experiment = config.get_experiment_from_key('test_experiment')
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user', 'browser_type' => 0)
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
@@ -234,14 +238,14 @@
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user',
                                                               invalid_attribute: 'sorry_not_sorry')
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
   it 'should create a valid Event when create_conversion_event is called' do
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, nil)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -255,7 +259,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', {'browser_type' => 'firefox'}, nil)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -267,7 +271,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -279,7 +283,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -290,7 +294,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -301,7 +305,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -316,7 +320,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -330,7 +334,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -343,7 +347,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -356,7 +360,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -369,7 +373,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -383,7 +387,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -396,7 +400,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', nil, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -421,7 +425,7 @@
 
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', {'browser_type' => 'firefox'}, event_tags)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -447,7 +451,7 @@
     experiment = config.get_experiment_from_key('test_experiment')
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user', user_attributes)
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
@@ -476,7 +480,7 @@
     expect(config.send(:bot_filtering)).to eq(true)
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user', user_attributes)
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
@@ -505,7 +509,7 @@
     allow(config).to receive(:bot_filtering).and_return(false)
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user', user_attributes)
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoint)
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 
@@ -530,7 +534,7 @@
     }
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', user_attributes, nil)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -551,7 +555,7 @@
     }
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', user_attributes, nil)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 
@@ -579,7 +583,7 @@
     allow(config).to receive(:bot_filtering).and_return(false)
     conversion_event = @event_builder.create_conversion_event(config, @event, 'test_user', user_attributes, nil)
     expect(conversion_event.params).to eq(@expected_conversion_params)
-    expect(conversion_event.url).to eq(@expected_endpoint)
+    expect(conversion_event.url).to eq(@expected_endpoints[:US])
     expect(conversion_event.http_verb).to eq(:post)
   end
 end
diff --git a/spec/spec_params.rb b/spec/spec_params.rb
index e43ce3cc..8735218f 100644
--- a/spec/spec_params.rb
+++ b/spec/spec_params.rb
@@ -19,6 +19,7 @@
 
 module OptimizelySpec
   VALID_CONFIG_BODY = {
+    'region' => 'US',
     'accountId' => '12001',
     'projectId' => '111001',
     'anonymizeIP' => false,

From 73769f1e84547200c8684546c975268b963a90f1 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 06:30:36 -0500
Subject: [PATCH 02/21] Fix lint issues

---
 lib/optimizely/event/event_factory.rb       |  4 ++--
 lib/optimizely/event_builder.rb             |  8 ++++----
 spec/config/datafile_project_config_spec.rb | 14 +++++++-------
 3 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/lib/optimizely/event/event_factory.rb b/lib/optimizely/event/event_factory.rb
index d8ad5913..3a714f56 100644
--- a/lib/optimizely/event/event_factory.rb
+++ b/lib/optimizely/event/event_factory.rb
@@ -72,9 +72,9 @@ def create_log_event(user_events, logger)
         builder.with_visitors(visitors)
         event_batch = builder.build
 
-        ENDPOINT = ENDPOINTS[user_context[:region].to_sym] || ENDPOINTS[:US]
+        endpoint = ENDPOINTS[user_context[:region].to_sym] || ENDPOINTS[:US]
 
-        Event.new(:post, ENDPOINT, event_batch.as_json, POST_HEADERS)
+        Event.new(:post, endpoint, event_batch.as_json, POST_HEADERS)
       end
 
       def build_attribute_list(user_attributes, project_config)
diff --git a/lib/optimizely/event_builder.rb b/lib/optimizely/event_builder.rb
index 7396d1da..9bf52758 100644
--- a/lib/optimizely/event_builder.rb
+++ b/lib/optimizely/event_builder.rb
@@ -130,9 +130,9 @@ def create_impression_event(project_config, experiment, variation_id, user_id, a
       impression_params = get_impression_params(project_config, experiment, variation_id)
       event_params[:visitors][0][:snapshots].push(impression_params)
 
-      ENDPOINT = ENDPOINTS[region]
+      endpoint = ENDPOINTS[region]
 
-      Event.new(:post, ENDPOINT, event_params, POST_HEADERS)
+      Event.new(:post, endpoint, event_params, POST_HEADERS)
     end
 
     def create_conversion_event(project_config, event, user_id, attributes, event_tags)
@@ -151,9 +151,9 @@ def create_conversion_event(project_config, event, user_id, attributes, event_ta
       conversion_params = get_conversion_params(event, event_tags)
       event_params[:visitors][0][:snapshots] = [conversion_params]
 
-      ENDPOINT = ENDPOINTS[region]
+      endpoint = ENDPOINTS[region]
 
-      Event.new(:post, ENDPOINT, event_params, POST_HEADERS)
+      Event.new(:post, endpoint, event_params, POST_HEADERS)
     end
 
     private
diff --git a/spec/config/datafile_project_config_spec.rb b/spec/config/datafile_project_config_spec.rb
index 05b90a5f..74c264b3 100644
--- a/spec/config/datafile_project_config_spec.rb
+++ b/spec/config/datafile_project_config_spec.rb
@@ -763,15 +763,15 @@
     end
 
     it 'should parse region specified in datafile correctly' do
-      project_configUS = Optimizely::DatafileProjectConfig.new(config_body_JSON, logger, error_handler)
-      expect(project_config.region).to eq('US')
+      project_config_us = Optimizely::DatafileProjectConfig.new(config_body_JSON, logger, error_handler)
+      expect(project_config_us.region).to eq('US')
 
-      config_bodyEU = config_body.dup
-      config_bodyEU['region'] = 'EU'
-      config_body_JSON = JSON.dump(config_bodyEU)
-      project_configEU = Optimizely::DatafileProjectConfig.new(config_body_JSON, logger, error_handler)
+      config_body_eu = config_body.dup
+      config_body_eu['region'] = 'EU'
+      config_body_json = JSON.dump(config_body_eu)
+      project_config_eu = Optimizely::DatafileProjectConfig.new(config_body_json, logger, error_handler)
 
-      expect(project_config.region).to eq('EU')
+      expect(project_config_eu.region).to eq('EU')
     end
 
     it 'should initialize properties correctly upon creating project with typed audience dict' do

From f9156d016ada992d0d328e1da8e00d56386b6068 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 06:32:45 -0500
Subject: [PATCH 03/21] Fix lint

---
 lib/optimizely/event/event_factory.rb | 2 +-
 lib/optimizely/event_builder.rb       | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/optimizely/event/event_factory.rb b/lib/optimizely/event/event_factory.rb
index 3a714f56..c6638034 100644
--- a/lib/optimizely/event/event_factory.rb
+++ b/lib/optimizely/event/event_factory.rb
@@ -31,7 +31,7 @@ class << self
       ENDPOINTS = {
         US: 'https://logx.optimizely.com/v1/events',
         EU: 'https://eu.logx.optimizely.com/v1/events'
-      }
+      }.freeze
       POST_HEADERS = {'Content-Type' => 'application/json'}.freeze
       ACTIVATE_EVENT_KEY = 'campaign_activated'
 
diff --git a/lib/optimizely/event_builder.rb b/lib/optimizely/event_builder.rb
index 9bf52758..c4600997 100644
--- a/lib/optimizely/event_builder.rb
+++ b/lib/optimizely/event_builder.rb
@@ -110,7 +110,7 @@ class EventBuilder < BaseEventBuilder
     ENDPOINTS = {
       US: 'https://logx.optimizely.com/v1/events',
       EU: 'https://eu.logx.optimizely.com/v1/events'
-    }
+    }.freeze
     POST_HEADERS = {'Content-Type' => 'application/json'}.freeze
     ACTIVATE_EVENT_KEY = 'campaign_activated'
 

From a5e6faf7354616fed79d826e9c824735d1caab1b Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 06:36:42 -0500
Subject: [PATCH 04/21] Fix test

---
 lib/optimizely/event/entity/event_context.rb | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/optimizely/event/entity/event_context.rb b/lib/optimizely/event/entity/event_context.rb
index 65f8f18e..f26b30a2 100644
--- a/lib/optimizely/event/entity/event_context.rb
+++ b/lib/optimizely/event/entity/event_context.rb
@@ -26,7 +26,8 @@ def initialize(
       anonymize_ip:,
       revision:,
       client_name:,
-      client_version:
+      client_version:,
+      region:
     )
       @account_id = account_id
       @project_id = project_id
@@ -34,6 +35,7 @@ def initialize(
       @revision = revision
       @client_name = client_name
       @client_version = client_version
+      @region = region
     end
 
     def as_json
@@ -43,7 +45,8 @@ def as_json
         anonymize_ip: @anonymize_ip,
         revision: @revision,
         client_name: @client_name,
-        client_version: @client_version
+        client_version: @client_version,
+        region: @region
       }
     end
   end

From 9f477063b3c6b58f67f5253f5329e6af073edcfd Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 06:40:01 -0500
Subject: [PATCH 05/21] Add with region

---
 lib/optimizely/event/entity/event_batch.rb | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/optimizely/event/entity/event_batch.rb b/lib/optimizely/event/entity/event_batch.rb
index 70aca415..f67c3c54 100644
--- a/lib/optimizely/event/entity/event_batch.rb
+++ b/lib/optimizely/event/entity/event_batch.rb
@@ -29,13 +29,14 @@ def as_json
         client_version: @client_version,
         anonymize_ip: @anonymize_ip,
         enrich_decisions: @enrich_decisions,
-        visitors: @visitors
+        visitors: @visitors,
+        region: @region
       }
     end
 
     class Builder
       attr_reader :account_id, :project_id, :revision, :client_name, :client_version,
-                  :anonymize_ip, :enrich_decisions, :visitors
+                  :anonymize_ip, :enrich_decisions, :visitors, :region
 
       def build
         event_batch = EventBatch.new
@@ -47,6 +48,7 @@ def build
         event_batch.anonymize_ip = @anonymize_ip
         event_batch.enrich_decisions = @enrich_decisions
         event_batch.visitors = @visitors
+        event_batch.region = @region
         event_batch
       end
 
@@ -62,6 +64,10 @@ def with_revision(revision)
         @revision = revision
       end
 
+      def region(region)
+        @region = region
+      end
+
       def with_client_name(client_name)
         @client_name = client_name
       end

From e776eada2688ec482e14abc4a9240328ff67cdb3 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 06:41:15 -0500
Subject: [PATCH 06/21] Fix lint

---
 lib/optimizely/event/entity/event_batch.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/optimizely/event/entity/event_batch.rb b/lib/optimizely/event/entity/event_batch.rb
index f67c3c54..6dbb54d8 100644
--- a/lib/optimizely/event/entity/event_batch.rb
+++ b/lib/optimizely/event/entity/event_batch.rb
@@ -64,7 +64,7 @@ def with_revision(revision)
         @revision = revision
       end
 
-      def region(region)
+      def with_region(region)
         @region = region
       end
 

From 884c9721f4cd5d3cdac3e0f8bb5c60de14528383 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 06:43:30 -0500
Subject: [PATCH 07/21] Fix lint issue

---
 lib/optimizely/event/entity/event_batch.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/optimizely/event/entity/event_batch.rb b/lib/optimizely/event/entity/event_batch.rb
index 6dbb54d8..b72d9c2e 100644
--- a/lib/optimizely/event/entity/event_batch.rb
+++ b/lib/optimizely/event/entity/event_batch.rb
@@ -18,7 +18,7 @@
 module Optimizely
   class EventBatch
     attr_accessor :account_id, :project_id, :revision, :client_name, :client_version,
-                  :anonymize_ip, :enrich_decisions, :visitors
+                  :anonymize_ip, :enrich_decisions, :visitors, :region
 
     def as_json
       {

From 6d0245ed0279c8ec25845babe2bfab979d8a1f52 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 06:55:05 -0500
Subject: [PATCH 08/21] Correct the Region default value

---
 lib/optimizely/config/datafile_project_config.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/optimizely/config/datafile_project_config.rb b/lib/optimizely/config/datafile_project_config.rb
index 44fd0bf0..25480c9b 100644
--- a/lib/optimizely/config/datafile_project_config.rb
+++ b/lib/optimizely/config/datafile_project_config.rb
@@ -68,7 +68,7 @@ def initialize(datafile, logger, error_handler)
       @rollouts = config.fetch('rollouts', [])
       @send_flag_decisions = config.fetch('sendFlagDecisions', false)
       @integrations = config.fetch('integrations', [])
-      @region = config.fetch('region', 'US')
+      @region = 'US' if @region.nil? || @region.empty?
 
       # Json type is represented in datafile as a subtype of string for the sake of backwards compatibility.
       # Converting it to a first-class json type while creating Project Config

From e1ae8b5778ae24f20f2da98840876ea5212abe26 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 07:11:41 -0500
Subject: [PATCH 09/21] Fix failed tests

---
 .../config/datafile_project_config.rb         |  3 +++
 spec/optimizely_user_context_spec.rb          |  9 +++++---
 spec/project_spec.rb                          | 21 ++++++++++++-------
 3 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/lib/optimizely/config/datafile_project_config.rb b/lib/optimizely/config/datafile_project_config.rb
index 25480c9b..f859d724 100644
--- a/lib/optimizely/config/datafile_project_config.rb
+++ b/lib/optimizely/config/datafile_project_config.rb
@@ -68,6 +68,9 @@ def initialize(datafile, logger, error_handler)
       @rollouts = config.fetch('rollouts', [])
       @send_flag_decisions = config.fetch('sendFlagDecisions', false)
       @integrations = config.fetch('integrations', [])
+      @region = config.fetch('region', 'US')
+      
+      # Default to US region if not specified
       @region = 'US' if @region.nil? || @region.empty?
 
       # Json type is represented in datafile as a subtype of string for the sake of backwards compatibility.
diff --git a/spec/optimizely_user_context_spec.rb b/spec/optimizely_user_context_spec.rb
index 515068c0..b47550bc 100644
--- a/spec/optimizely_user_context_spec.rb
+++ b/spec/optimizely_user_context_spec.rb
@@ -224,7 +224,8 @@
             type: 'custom',
             value: true
           }]
-        }]
+        }],
+        region: 'US'
       }
       stub_request(:post, impression_log_url)
       expect(forced_decision_project_instance.notification_center).to receive(:send_notifications)
@@ -323,7 +324,8 @@
             type: 'custom',
             value: true
           }]
-        }]
+        }],
+        region: 'US'
       }
 
       expect(forced_decision_project_instance.notification_center).to receive(:send_notifications)
@@ -442,7 +444,8 @@
             type: 'custom',
             value: true
           }]
-        }]
+        }],
+        region: 'US'
       }
       stub_request(:post, impression_log_url)
       expect(forced_decision_project_instance.notification_center).to receive(:send_notifications)
diff --git a/spec/project_spec.rb b/spec/project_spec.rb
index f857a5ce..e14c77ba 100644
--- a/spec/project_spec.rb
+++ b/spec/project_spec.rb
@@ -274,7 +274,8 @@ class InvalidErrorHandler; end # rubocop:disable Lint/ConstantDefinitionInBlock
         revision: '42',
         client_name: Optimizely::CLIENT_ENGINE,
         enrich_decisions: true,
-        client_version: Optimizely::VERSION
+        client_version: Optimizely::VERSION,
+        region: 'US'
       }
     end
 
@@ -393,7 +394,8 @@ class InvalidErrorHandler; end # rubocop:disable Lint/ConstantDefinitionInBlock
           revision: '3',
           client_name: Optimizely::CLIENT_ENGINE,
           enrich_decisions: true,
-          client_version: Optimizely::VERSION
+          client_version: Optimizely::VERSION,
+          region: 'US'
         }
       end
 
@@ -1079,7 +1081,8 @@ def callback(_args); end
         revision: '42',
         client_name: Optimizely::CLIENT_ENGINE,
         enrich_decisions: true,
-        client_version: Optimizely::VERSION
+        client_version: Optimizely::VERSION,
+        region: 'US'
       }
     end
 
@@ -1251,7 +1254,8 @@ def callback(_args); end
           revision: '3',
           client_name: Optimizely::CLIENT_ENGINE,
           enrich_decisions: true,
-          client_version: Optimizely::VERSION
+          client_version: Optimizely::VERSION,
+          region: 'US'
         }
       end
       after(:example) do
@@ -1615,7 +1619,8 @@ def callback(_args); end
         revision: '42',
         client_name: Optimizely::CLIENT_ENGINE,
         enrich_decisions: true,
-        client_version: Optimizely::VERSION
+        client_version: Optimizely::VERSION,
+        region: 'US'
       }
     end
 
@@ -3867,7 +3872,8 @@ def callback(_args); end
               type: 'custom',
               value: true
             }]
-          }]
+          }],
+          region: 'US'
         }
         expect(project_instance.event_dispatcher).to have_received(:dispatch_event).with(Optimizely::Event.new(:post, impression_log_url, expected_params, post_headers))
       end
@@ -4024,7 +4030,8 @@ def callback(_args); end
               type: 'custom',
               value: true
             }]
-          }]
+          }],
+          region: 'US'
         }
         expect(project_instance.event_dispatcher).to have_received(:dispatch_event).with(Optimizely::Event.new(:post, impression_log_url, expected_params, post_headers))
       end

From c8a47b1bc2c652468e54dbe59c22a8ad58e0bdf9 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 07:12:59 -0500
Subject: [PATCH 10/21] Fix lint

---
 lib/optimizely/config/datafile_project_config.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/optimizely/config/datafile_project_config.rb b/lib/optimizely/config/datafile_project_config.rb
index f859d724..14e5b168 100644
--- a/lib/optimizely/config/datafile_project_config.rb
+++ b/lib/optimizely/config/datafile_project_config.rb
@@ -69,7 +69,7 @@ def initialize(datafile, logger, error_handler)
       @send_flag_decisions = config.fetch('sendFlagDecisions', false)
       @integrations = config.fetch('integrations', [])
       @region = config.fetch('region', 'US')
-      
+
       # Default to US region if not specified
       @region = 'US' if @region.nil? || @region.empty?
 

From 93e7a11bb94c7ecc5c54ef7c07bd5c717ce7ec8e Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 07:54:10 -0500
Subject: [PATCH 11/21] Fix test cases

---
 spec/event_builder_spec.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/spec/event_builder_spec.rb b/spec/event_builder_spec.rb
index 9efdbb81..80d35c7c 100644
--- a/spec/event_builder_spec.rb
+++ b/spec/event_builder_spec.rb
@@ -72,7 +72,8 @@
       revision: '42',
       client_name: Optimizely::CLIENT_ENGINE,
       enrich_decisions: true,
-      client_version: Optimizely::VERSION
+      client_version: Optimizely::VERSION,
+      region: 'US'
     }
     @expected_conversion_params = {
       account_id: '12001',

From 06295e69fdefe25a326318d6b7dc486108742e34 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 08:04:37 -0500
Subject: [PATCH 12/21] Fix event builder

---
 lib/optimizely/event_builder.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/optimizely/event_builder.rb b/lib/optimizely/event_builder.rb
index c4600997..5eb7decd 100644
--- a/lib/optimizely/event_builder.rb
+++ b/lib/optimizely/event_builder.rb
@@ -101,7 +101,8 @@ def get_common_params(project_config, user_id, attributes)
         revision: project_config.revision,
         client_name: CLIENT_ENGINE,
         enrich_decisions: true,
-        client_version: VERSION
+        client_version: VERSION,
+        region: project_config.region || 'US'
       }
     end
   end

From 04e3a7e9ad6541e610c11d8b7f8db8f1d5f96703 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 08:08:48 -0500
Subject: [PATCH 13/21] Fix the issue

---
 lib/optimizely/event_builder.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/optimizely/event_builder.rb b/lib/optimizely/event_builder.rb
index 5eb7decd..3f7f519a 100644
--- a/lib/optimizely/event_builder.rb
+++ b/lib/optimizely/event_builder.rb
@@ -131,7 +131,7 @@ def create_impression_event(project_config, experiment, variation_id, user_id, a
       impression_params = get_impression_params(project_config, experiment, variation_id)
       event_params[:visitors][0][:snapshots].push(impression_params)
 
-      endpoint = ENDPOINTS[region]
+      endpoint = ENDPOINTS[region.to_sym]
 
       Event.new(:post, endpoint, event_params, POST_HEADERS)
     end
@@ -152,7 +152,7 @@ def create_conversion_event(project_config, event, user_id, attributes, event_ta
       conversion_params = get_conversion_params(event, event_tags)
       event_params[:visitors][0][:snapshots] = [conversion_params]
 
-      endpoint = ENDPOINTS[region]
+      endpoint = ENDPOINTS[region.to_sym]
 
       Event.new(:post, endpoint, event_params, POST_HEADERS)
     end

From 474d01d9e798d4cd98f4dad54486db94331a2d44 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 08:13:46 -0500
Subject: [PATCH 14/21] Fix typo

---
 spec/event_builder_spec.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/spec/event_builder_spec.rb b/spec/event_builder_spec.rb
index 80d35c7c..62cf5ba1 100644
--- a/spec/event_builder_spec.rb
+++ b/spec/event_builder_spec.rb
@@ -215,7 +215,7 @@
     impression_event = @event_builder.create_impression_event(config, experiment, '111128', 'test_user',
                                                               'browser_type' => false)
     expect(impression_event.params).to eq(@expected_impression_params)
-    expect(impression_event.url).to eq(@expected_endpoins[:US])
+    expect(impression_event.url).to eq(@expected_endpoints[:US])
     expect(impression_event.http_verb).to eq(:post)
   end
 

From ae26cedd59a1c1dd2f513e139d33c3d1d9e0edb8 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 08:16:42 -0500
Subject: [PATCH 15/21] Correct the event name

---
 spec/event/user_event_factory_spec.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/spec/event/user_event_factory_spec.rb b/spec/event/user_event_factory_spec.rb
index 53f678f1..f1ed533e 100644
--- a/spec/event/user_event_factory_spec.rb
+++ b/spec/event/user_event_factory_spec.rb
@@ -110,7 +110,7 @@
       expect(conversion_event.event_context[:project_id]).to eq(project_config.project_id)
       expect(conversion_event.event_context[:revision]).to eq(project_config.revision)
       expect(conversion_event.event_context[:anonymize_ip]).to eq(project_config.anonymize_ip)
-      expect(impression_event.event_context[:region]).to eq(project_config.region)
+      expect(conversion_event.event_context[:region]).to eq(project_config.region)
       expect(conversion_event.event['key']).to eq(event['key'])
       expect(conversion_event.bot_filtering).to eq(project_config.bot_filtering)
       expect(conversion_event.user_id).to eq('test_user')
@@ -144,7 +144,7 @@
       expect(conversion_event.event_context[:project_id]).to eq(project_config.project_id)
       expect(conversion_event.event_context[:revision]).to eq(project_config.revision)
       expect(conversion_event.event_context[:anonymize_ip]).to eq(project_config.anonymize_ip)
-      expect(impression_event.event_context[:region]).to eq(project_config.region)
+      expect(conversion_event.event_context[:region]).to eq(project_config.region)
       expect(conversion_event.event['key']).to eq(event['key'])
       expect(conversion_event.bot_filtering).to eq(project_config.bot_filtering)
       expect(conversion_event.user_id).to eq('test_user')

From 80d0c16666518b47ff64326bc0885e3231e6b79e Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 08:42:26 -0500
Subject: [PATCH 16/21] Fix errors

---
 spec/event_builder_spec.rb | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/spec/event_builder_spec.rb b/spec/event_builder_spec.rb
index 62cf5ba1..d8ad706c 100644
--- a/spec/event_builder_spec.rb
+++ b/spec/event_builder_spec.rb
@@ -39,10 +39,9 @@
     allow(Time).to receive(:now).and_return(time_now)
     allow(SecureRandom).to receive(:uuid).and_return('a68cf1ad-0393-4e18-af87-efe8f01a7c9c')
 
-    @expected_endpoints = {
-      US: 'https://logx.optimizely.com/v1/events',
-      EU: 'https://eu.logx.optimizely.com/v1/events'
-    }
+    @expected_endpoints = {}
+    @expected_endpoints[:US] = 'https://logx.optimizely.com/v1/events'
+    @expected_endpoints[:EU] = 'https://eu.logx.optimizely.com/v1/events'
     @expected_impression_params = {
       account_id: '12001',
       project_id: '111001',

From fd72f773a89c534409ba609384171979ae2f71ca Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 08:55:19 -0500
Subject: [PATCH 17/21] Fix errors

---
 spec/event/event_factory_spec.rb | 2 +-
 spec/event_builder_spec.rb       | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/spec/event/event_factory_spec.rb b/spec/event/event_factory_spec.rb
index 00492ba0..fc779467 100644
--- a/spec/event/event_factory_spec.rb
+++ b/spec/event/event_factory_spec.rb
@@ -34,7 +34,7 @@
     allow(Time).to receive(:now).and_return(time_now)
     allow(SecureRandom).to receive(:uuid).and_return('a68cf1ad-0393-4e18-af87-efe8f01a7c9c')
 
-    @expected_endpoints[:US] = {
+    @expected_endpoints = {
       US: 'https://logx.optimizely.com/v1/events',
       EU: 'https://eu.logx.optimizely.com/v1/events'
     }
diff --git a/spec/event_builder_spec.rb b/spec/event_builder_spec.rb
index d8ad706c..62cf5ba1 100644
--- a/spec/event_builder_spec.rb
+++ b/spec/event_builder_spec.rb
@@ -39,9 +39,10 @@
     allow(Time).to receive(:now).and_return(time_now)
     allow(SecureRandom).to receive(:uuid).and_return('a68cf1ad-0393-4e18-af87-efe8f01a7c9c')
 
-    @expected_endpoints = {}
-    @expected_endpoints[:US] = 'https://logx.optimizely.com/v1/events'
-    @expected_endpoints[:EU] = 'https://eu.logx.optimizely.com/v1/events'
+    @expected_endpoints = {
+      US: 'https://logx.optimizely.com/v1/events',
+      EU: 'https://eu.logx.optimizely.com/v1/events'
+    }
     @expected_impression_params = {
       account_id: '12001',
       project_id: '111001',

From 4dea3ec1a76c7a4d632f30171e5c720080351cbc Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 08:59:25 -0500
Subject: [PATCH 18/21] Fix test cases

---
 spec/event/event_factory_spec.rb              | 6 ++++--
 spec/event/forwarding_event_processor_spec.rb | 3 ++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/spec/event/event_factory_spec.rb b/spec/event/event_factory_spec.rb
index fc779467..dbf4b175 100644
--- a/spec/event/event_factory_spec.rb
+++ b/spec/event/event_factory_spec.rb
@@ -73,7 +73,8 @@
       revision: '42',
       client_name: Optimizely::CLIENT_ENGINE,
       enrich_decisions: true,
-      client_version: Optimizely::VERSION
+      client_version: Optimizely::VERSION,
+      region: 'US'
     }
     @expected_conversion_params = {
       account_id: '12001',
@@ -99,7 +100,8 @@
       revision: '42',
       client_name: Optimizely::CLIENT_ENGINE,
       enrich_decisions: true,
-      client_version: Optimizely::VERSION
+      client_version: Optimizely::VERSION,
+      region: 'US'
     }
   end
 
diff --git a/spec/event/forwarding_event_processor_spec.rb b/spec/event/forwarding_event_processor_spec.rb
index f58d0e90..582bac30 100644
--- a/spec/event/forwarding_event_processor_spec.rb
+++ b/spec/event/forwarding_event_processor_spec.rb
@@ -64,7 +64,8 @@
       revision: '42',
       client_name: Optimizely::CLIENT_ENGINE,
       enrich_decisions: true,
-      client_version: Optimizely::VERSION
+      client_version: Optimizely::VERSION,
+      region: 'US'
     }
   end
 

From 904d0bd1bcc76c0acc51258b2239a21e9030ab06 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 09:28:38 -0500
Subject: [PATCH 19/21] Fix test cases

---
 lib/optimizely/event/entity/event_batch.rb | 4 ++--
 spec/event/event_entities_spec.rb          | 6 ++++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/optimizely/event/entity/event_batch.rb b/lib/optimizely/event/entity/event_batch.rb
index b72d9c2e..d49d85a8 100644
--- a/lib/optimizely/event/entity/event_batch.rb
+++ b/lib/optimizely/event/entity/event_batch.rb
@@ -48,7 +48,7 @@ def build
         event_batch.anonymize_ip = @anonymize_ip
         event_batch.enrich_decisions = @enrich_decisions
         event_batch.visitors = @visitors
-        event_batch.region = @region
+        event_batch.region = @region || 'US'
         event_batch
       end
 
@@ -65,7 +65,7 @@ def with_revision(revision)
       end
 
       def with_region(region)
-        @region = region
+        @region = region || 'US'
       end
 
       def with_client_name(client_name)
diff --git a/spec/event/event_entities_spec.rb b/spec/event/event_entities_spec.rb
index 7d747ed2..47be87dc 100644
--- a/spec/event/event_entities_spec.rb
+++ b/spec/event/event_entities_spec.rb
@@ -69,7 +69,8 @@
       revision: '42',
       client_name: Optimizely::CLIENT_ENGINE,
       enrich_decisions: true,
-      client_version: Optimizely::VERSION
+      client_version: Optimizely::VERSION,
+      region: 'US'
     }
 
     @expected_conversion_payload = {
@@ -103,7 +104,8 @@
       revision: '42',
       client_name: Optimizely::CLIENT_ENGINE,
       enrich_decisions: true,
-      client_version: Optimizely::VERSION
+      client_version: Optimizely::VERSION,
+      region: 'US'
     }
   end
 

From 7f985642a1e567752a68a0478ccdd734aeb0dcad Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 11:25:39 -0500
Subject: [PATCH 20/21] Implement copilot review comments

---
 lib/optimizely/event/entity/event_batch.rb | 2 +-
 lib/optimizely/event/event_factory.rb      | 2 +-
 lib/optimizely/event_builder.rb            | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/optimizely/event/entity/event_batch.rb b/lib/optimizely/event/entity/event_batch.rb
index d49d85a8..aee5bdb7 100644
--- a/lib/optimizely/event/entity/event_batch.rb
+++ b/lib/optimizely/event/entity/event_batch.rb
@@ -48,7 +48,7 @@ def build
         event_batch.anonymize_ip = @anonymize_ip
         event_batch.enrich_decisions = @enrich_decisions
         event_batch.visitors = @visitors
-        event_batch.region = @region || 'US'
+        event_batch.region = @region.nil? || 'US': @region
         event_batch
       end
 
diff --git a/lib/optimizely/event/event_factory.rb b/lib/optimizely/event/event_factory.rb
index c6638034..b85b8951 100644
--- a/lib/optimizely/event/event_factory.rb
+++ b/lib/optimizely/event/event_factory.rb
@@ -72,7 +72,7 @@ def create_log_event(user_events, logger)
         builder.with_visitors(visitors)
         event_batch = builder.build
 
-        endpoint = ENDPOINTS[user_context[:region].to_sym] || ENDPOINTS[:US]
+        endpoint = ENDPOINTS[user_context[:region].to_s.upcase.to_sym] || ENDPOINTS[:US]
 
         Event.new(:post, endpoint, event_batch.as_json, POST_HEADERS)
       end
diff --git a/lib/optimizely/event_builder.rb b/lib/optimizely/event_builder.rb
index 3f7f519a..a5ee82a9 100644
--- a/lib/optimizely/event_builder.rb
+++ b/lib/optimizely/event_builder.rb
@@ -131,7 +131,7 @@ def create_impression_event(project_config, experiment, variation_id, user_id, a
       impression_params = get_impression_params(project_config, experiment, variation_id)
       event_params[:visitors][0][:snapshots].push(impression_params)
 
-      endpoint = ENDPOINTS[region.to_sym]
+      endpoint = ENDPOINTS[region.to_s.upcase.to_sym]
 
       Event.new(:post, endpoint, event_params, POST_HEADERS)
     end
@@ -152,7 +152,7 @@ def create_conversion_event(project_config, event, user_id, attributes, event_ta
       conversion_params = get_conversion_params(event, event_tags)
       event_params[:visitors][0][:snapshots] = [conversion_params]
 
-      endpoint = ENDPOINTS[region.to_sym]
+      endpoint = ENDPOINTS[region.to_s.upcase.to_sym]
 
       Event.new(:post, endpoint, event_params, POST_HEADERS)
     end

From 56bc8cd90625a0553e52efe0879d4fe1f7b425e9 Mon Sep 17 00:00:00 2001
From: esrakartalOpt <esra.kartal@optimizely.com>
Date: Mon, 30 Jun 2025 11:28:03 -0500
Subject: [PATCH 21/21] Fix lint

---
 lib/optimizely/event/entity/event_batch.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/optimizely/event/entity/event_batch.rb b/lib/optimizely/event/entity/event_batch.rb
index aee5bdb7..d49d85a8 100644
--- a/lib/optimizely/event/entity/event_batch.rb
+++ b/lib/optimizely/event/entity/event_batch.rb
@@ -48,7 +48,7 @@ def build
         event_batch.anonymize_ip = @anonymize_ip
         event_batch.enrich_decisions = @enrich_decisions
         event_batch.visitors = @visitors
-        event_batch.region = @region.nil? || 'US': @region
+        event_batch.region = @region || 'US'
         event_batch
       end