From 3a9da919f75644d2a5dc216a73ac4fdc7dac6e4c Mon Sep 17 00:00:00 2001
From: Tim Yiu <137842098+tyiuhc@users.noreply.github.com>
Date: Mon, 10 Nov 2025 14:01:42 -0800
Subject: [PATCH 1/2] fix: add serverZone config to remote evaluation client

---
 src/amplitude_experiment/local/config.py  |  4 ++--
 src/amplitude_experiment/remote/config.py | 13 ++++++++++---
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/amplitude_experiment/local/config.py b/src/amplitude_experiment/local/config.py
index 2331f97..7883783 100644
--- a/src/amplitude_experiment/local/config.py
+++ b/src/amplitude_experiment/local/config.py
@@ -4,7 +4,7 @@
 from ..cohort.cohort_sync_config import CohortSyncConfig, DEFAULT_COHORT_SYNC_URL, EU_COHORT_SYNC_URL
 
 DEFAULT_SERVER_URL = 'https://api.lab.amplitude.com'
-EU_SERVER_URL = 'https://flag.lab.eu.amplitude.com'
+EU_FLAG_SERVER_URL = 'https://flag.lab.eu.amplitude.com'
 
 DEFAULT_STREAM_URL = 'https://stream.lab.amplitude.com'
 EU_STREAM_SERVER_URL = 'https://stream.lab.eu.amplitude.com'
@@ -49,7 +49,7 @@ def __init__(self, debug: bool = False,
         self.server_zone = server_zone
         self.cohort_sync_config = cohort_sync_config
         if server_url == DEFAULT_SERVER_URL and server_zone == ServerZone.EU:
-            self.server_url = EU_SERVER_URL
+            self.server_url = EU_FLAG_SERVER_URL
             if (cohort_sync_config is not None and
                     cohort_sync_config.cohort_server_url == DEFAULT_COHORT_SYNC_URL):
                 self.cohort_sync_config.cohort_server_url = EU_COHORT_SYNC_URL
diff --git a/src/amplitude_experiment/remote/config.py b/src/amplitude_experiment/remote/config.py
index 7e84bf5..d8f18c3 100644
--- a/src/amplitude_experiment/remote/config.py
+++ b/src/amplitude_experiment/remote/config.py
@@ -1,8 +1,9 @@
+DEFAULT_SERVER_URL = 'https://api.lab.amplitude.com'
+EU_SERVER_URL = 'https://api.lab.eu.amplitude.com'
+
 class RemoteEvaluationConfig:
     """Experiment Remote Client Configuration"""
 
-    DEFAULT_SERVER_URL = 'https://api.lab.amplitude.com'
-
     def __init__(self, debug=False,
                  server_url=DEFAULT_SERVER_URL,
                  fetch_timeout_millis=10000,
@@ -10,7 +11,8 @@ def __init__(self, debug=False,
                  fetch_retry_backoff_min_millis=500,
                  fetch_retry_backoff_max_millis=10000,
                  fetch_retry_backoff_scalar=1.5,
-                 fetch_retry_timeout_millis=10000):
+                 fetch_retry_timeout_millis=10000,
+                 server_zone='us'):
         """
         Initialize a config
             Parameters:
@@ -25,6 +27,7 @@ def __init__(self, debug=False,
                   greater than the max, the max is used for all subsequent retries.
                 fetch_retry_backoff_scalar (float): Scales the minimum backoff exponentially.
                 fetch_retry_timeout_millis (int): The request timeout for retrying fetch requests.
+                server_zone (str): Select the Amplitude data center to get flags and variants from, `us` or `eu`.
 
             Returns:
                 The config object
@@ -37,3 +40,7 @@ def __init__(self, debug=False,
         self.fetch_retry_backoff_max_millis = fetch_retry_backoff_max_millis
         self.fetch_retry_backoff_scalar = fetch_retry_backoff_scalar
         self.fetch_retry_timeout_millis = fetch_retry_timeout_millis
+        self.server_zone = server_zone
+        if server_url == DEFAULT_SERVER_URL and server_zone == 'eu':
+            self.server_url = EU_SERVER_URL
+

From bc13e12738a1c0fd5646f32bc66ab37172ab5670 Mon Sep 17 00:00:00 2001
From: Tim Yiu <137842098+tyiuhc@users.noreply.github.com>
Date: Mon, 10 Nov 2025 14:23:04 -0800
Subject: [PATCH 2/2] revert

---
 src/amplitude_experiment/local/config.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/amplitude_experiment/local/config.py b/src/amplitude_experiment/local/config.py
index 7883783..2331f97 100644
--- a/src/amplitude_experiment/local/config.py
+++ b/src/amplitude_experiment/local/config.py
@@ -4,7 +4,7 @@
 from ..cohort.cohort_sync_config import CohortSyncConfig, DEFAULT_COHORT_SYNC_URL, EU_COHORT_SYNC_URL
 
 DEFAULT_SERVER_URL = 'https://api.lab.amplitude.com'
-EU_FLAG_SERVER_URL = 'https://flag.lab.eu.amplitude.com'
+EU_SERVER_URL = 'https://flag.lab.eu.amplitude.com'
 
 DEFAULT_STREAM_URL = 'https://stream.lab.amplitude.com'
 EU_STREAM_SERVER_URL = 'https://stream.lab.eu.amplitude.com'
@@ -49,7 +49,7 @@ def __init__(self, debug: bool = False,
         self.server_zone = server_zone
         self.cohort_sync_config = cohort_sync_config
         if server_url == DEFAULT_SERVER_URL and server_zone == ServerZone.EU:
-            self.server_url = EU_FLAG_SERVER_URL
+            self.server_url = EU_SERVER_URL
             if (cohort_sync_config is not None and
                     cohort_sync_config.cohort_server_url == DEFAULT_COHORT_SYNC_URL):
                 self.cohort_sync_config.cohort_server_url = EU_COHORT_SYNC_URL