From 53e8d6c8ae84e72d17b620a136101d6accd24a31 Mon Sep 17 00:00:00 2001
From: Kim Gustyr <kim.gustyr@flagsmith.com>
Date: Thu, 10 Jul 2025 20:11:28 +0100
Subject: [PATCH 1/7] feat: Support SDK metrics

---
 flagsmith/__init__.py   |  7 +--
 flagsmith/flagsmith.py  | 31 +++++++++++++-
 flagsmith/types.py      |  7 ++-
 flagsmith/version.py    |  3 ++
 tests/test_flagsmith.py | 95 ++++++++++++++++++++++++++++++++++++++++-
 5 files changed, 136 insertions(+), 7 deletions(-)
 create mode 100644 flagsmith/version.py

diff --git a/flagsmith/__init__.py b/flagsmith/__init__.py
index f576701..41473e4 100644
--- a/flagsmith/__init__.py
+++ b/flagsmith/__init__.py
@@ -1,4 +1,5 @@
-from . import webhooks
-from .flagsmith import Flagsmith
+from flagsmith import webhooks
+from flagsmith.flagsmith import Flagsmith
+from flagsmith.version import __version__
 
-__all__ = ("Flagsmith", "webhooks")
+__all__ = ("Flagsmith", "webhooks", "__version__")
diff --git a/flagsmith/flagsmith.py b/flagsmith/flagsmith.py
index 1d05fcc..db4b3a9 100644
--- a/flagsmith/flagsmith.py
+++ b/flagsmith/flagsmith.py
@@ -11,6 +11,7 @@
 from flag_engine.identities.traits.types import TraitValue
 from flag_engine.segments.evaluator import get_identity_segments
 from requests.adapters import HTTPAdapter
+from requests.utils import default_user_agent
 from urllib3 import Retry
 
 from flagsmith.analytics import AnalyticsProcessor
@@ -19,13 +20,15 @@
 from flagsmith.offline_handlers import BaseOfflineHandler
 from flagsmith.polling_manager import EnvironmentDataPollingManager
 from flagsmith.streaming_manager import EventStreamManager, StreamEvent
-from flagsmith.types import JsonType, TraitConfig, TraitMapping
+from flagsmith.types import ApplicationMetadata, JsonType, TraitConfig, TraitMapping
 from flagsmith.utils.identities import generate_identity_data
+from flagsmith.version import __version__
 
 logger = logging.getLogger(__name__)
 
 DEFAULT_API_URL = "https://edge.api.flagsmith.com/api/v1/"
 DEFAULT_REALTIME_API_URL = "https://realtime.flagsmith.com/"
+DEFAULT_USER_AGENT = f"flagsmith-python-client/{__version__} " + default_user_agent()
 
 
 class Flagsmith:
@@ -61,6 +64,7 @@ def __init__(
         offline_mode: bool = False,
         offline_handler: typing.Optional[BaseOfflineHandler] = None,
         enable_realtime_updates: bool = False,
+        application_metadata: typing.Optional[ApplicationMetadata] = None,
     ):
         """
         :param environment_key: The environment key obtained from Flagsmith interface.
@@ -88,6 +92,7 @@ def __init__(
             document from another source when in offline_mode. Works in place of
             default_flag_handler if offline_mode is not set and using remote evaluation.
         :param enable_realtime_updates: Use real-time functionality via SSE as opposed to polling the API
+        :param application_metadata: Optional metadata about the client application.
         """
 
         self.offline_mode = offline_mode
@@ -122,7 +127,11 @@ def __init__(
 
             self.session = requests.Session()
             self.session.headers.update(
-                **{"X-Environment-Key": environment_key}, **(custom_headers or {})
+                self._get_headers(
+                    environment_key=environment_key,
+                    application_metadata=application_metadata,
+                    custom_headers=custom_headers,
+                )
             )
             self.session.proxies.update(proxies or {})
             retries = retries or Retry(total=3, backoff_factor=0.1)
@@ -275,6 +284,24 @@ def update_environment(self) -> None:
                     identity.identifier: identity for identity in overrides
                 }
 
+    def _get_headers(
+        self,
+        environment_key: str,
+        application_metadata: ApplicationMetadata,
+        custom_headers: typing.Optional[typing.Dict[str, typing.Any]] = None,
+    ) -> typing.Dict[str, str]:
+        headers = {
+            "X-Environment-Key": environment_key,
+            "User-Agent": DEFAULT_USER_AGENT,
+        }
+        if application_metadata:
+            if name := application_metadata.get("name"):
+                headers["Flagsmith-Application-Name"] = name
+            if version := application_metadata.get("version"):
+                headers["Flagsmith-Application-Version"] = version
+        headers.update(custom_headers or {})
+        return headers
+
     def _get_environment_from_api(self) -> EnvironmentModel:
         environment_data = self._get_json_response(self.environment_url, method="GET")
         return EnvironmentModel.model_validate(environment_data)
diff --git a/flagsmith/types.py b/flagsmith/types.py
index b2a41a3..1681a44 100644
--- a/flagsmith/types.py
+++ b/flagsmith/types.py
@@ -1,7 +1,7 @@
 import typing
 
 from flag_engine.identities.traits.types import TraitValue
-from typing_extensions import TypeAlias
+from typing_extensions import TypeAlias, NotRequired
 
 _JsonScalarType: TypeAlias = typing.Union[
     int,
@@ -23,3 +23,8 @@ class TraitConfig(typing.TypedDict):
 
 
 TraitMapping: TypeAlias = typing.Mapping[str, typing.Union[TraitValue, TraitConfig]]
+
+
+class ApplicationMetadata(typing.TypedDict):
+    name: NotRequired[str]
+    version: NotRequired[str]
diff --git a/flagsmith/version.py b/flagsmith/version.py
new file mode 100644
index 0000000..aa2c58c
--- /dev/null
+++ b/flagsmith/version.py
@@ -0,0 +1,3 @@
+from importlib.metadata import version
+
+__version__ = version("flagsmith")
diff --git a/tests/test_flagsmith.py b/tests/test_flagsmith.py
index 71f3a1b..9bc0892 100644
--- a/tests/test_flagsmith.py
+++ b/tests/test_flagsmith.py
@@ -11,7 +11,7 @@
 from pytest_mock import MockerFixture
 from responses import matchers
 
-from flagsmith import Flagsmith
+from flagsmith import Flagsmith, __version__
 from flagsmith.exceptions import (
     FlagsmithAPIError,
     FlagsmithFeatureDoesNotExistError,
@@ -717,3 +717,96 @@ def test_custom_feature_error_raised_when_invalid_feature(
     with pytest.raises(FlagsmithFeatureDoesNotExistError):
         # When
         flags.is_feature_enabled("non-existing-feature")
+
+
+@pytest.fixture
+def default_headers() -> typing.Dict[str, str]:
+    return {
+        "User-Agent": f"flagsmith-python-client/{__version__} python-requests/2.32.4",
+        "Accept-Encoding": "gzip, deflate",
+        "Accept": "*/*",
+        "Connection": "keep-alive",
+    }
+
+
+@pytest.mark.parametrize(
+    "kwargs,expected_headers",
+    [
+        (
+            {
+                "environment_key": "test-key",
+                "application_metadata": {"name": "test-app", "version": "1.0.0"},
+            },
+            {
+                "Flagsmith-Application-Name": "test-app",
+                "Flagsmith-Application-Version": "1.0.0",
+                "X-Environment-Key": "test-key",
+            },
+        ),
+        (
+            {
+                "environment_key": "test-key",
+                "application_metadata": {"name": "test-app"},
+            },
+            {
+                "Flagsmith-Application-Name": "test-app",
+                "X-Environment-Key": "test-key",
+            },
+        ),
+        (
+            {
+                "environment_key": "test-key",
+                "application_metadata": {"version": "1.0.0"},
+            },
+            {
+                "Flagsmith-Application-Version": "1.0.0",
+                "X-Environment-Key": "test-key",
+            },
+        ),
+        (
+            {
+                "environment_key": "test-key",
+                "application_metadata": {"version": "1.0.0"},
+                "custom_headers": {"X-Custom-Header": "CustomValue"},
+            },
+            {
+                "Flagsmith-Application-Version": "1.0.0",
+                "X-Environment-Key": "test-key",
+                "X-Custom-Header": "CustomValue",
+            },
+        ),
+        (
+            {
+                "environment_key": "test-key",
+                "application_metadata": None,
+                "custom_headers": {"X-Custom-Header": "CustomValue"},
+            },
+            {
+                "X-Environment-Key": "test-key",
+                "X-Custom-Header": "CustomValue",
+            },
+        ),
+        (
+            {"environment_key": "test-key"},
+            {
+                "X-Environment-Key": "test-key",
+            },
+        ),
+    ],
+)
+@responses.activate()
+def test_flagsmith__init__expected_headers_sent(
+    default_headers: typing.Dict[str, str],
+    kwargs: typing.Dict[str, typing.Any],
+    expected_headers: typing.Dict[str, str],
+) -> None:
+    # Given
+    flagsmith = Flagsmith(**kwargs)
+    responses.add(method="GET", url=flagsmith.environment_flags_url, body="{}")
+
+    # When
+    flagsmith.get_environment_flags()
+
+    # Then
+    headers = responses.calls[0].request.headers
+    assert headers == {**default_headers, **expected_headers}

From 63f8cbe5f787f40703e54094deac06d02fd4bfe5 Mon Sep 17 00:00:00 2001
From: Kim Gustyr <kim.gustyr@flagsmith.com>
Date: Thu, 10 Jul 2025 20:19:34 +0100
Subject: [PATCH 2/7] fix import order

---
 flagsmith/flagsmith.py | 7 ++++++-
 flagsmith/types.py     | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/flagsmith/flagsmith.py b/flagsmith/flagsmith.py
index db4b3a9..ea0a764 100644
--- a/flagsmith/flagsmith.py
+++ b/flagsmith/flagsmith.py
@@ -20,7 +20,12 @@
 from flagsmith.offline_handlers import BaseOfflineHandler
 from flagsmith.polling_manager import EnvironmentDataPollingManager
 from flagsmith.streaming_manager import EventStreamManager, StreamEvent
-from flagsmith.types import ApplicationMetadata, JsonType, TraitConfig, TraitMapping
+from flagsmith.types import (
+    ApplicationMetadata,
+    JsonType,
+    TraitConfig,
+    TraitMapping,
+)
 from flagsmith.utils.identities import generate_identity_data
 from flagsmith.version import __version__
 
diff --git a/flagsmith/types.py b/flagsmith/types.py
index 1681a44..c0d535a 100644
--- a/flagsmith/types.py
+++ b/flagsmith/types.py
@@ -1,7 +1,7 @@
 import typing
 
 from flag_engine.identities.traits.types import TraitValue
-from typing_extensions import TypeAlias, NotRequired
+from typing_extensions import NotRequired, TypeAlias
 
 _JsonScalarType: TypeAlias = typing.Union[
     int,

From 3c9832f854ffc0e2313b078f9420a35f1afa705e Mon Sep 17 00:00:00 2001
From: Kim Gustyr <kim.gustyr@flagsmith.com>
Date: Thu, 10 Jul 2025 23:17:41 +0100
Subject: [PATCH 3/7] fix typing

---
 flagsmith/flagsmith.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/flagsmith/flagsmith.py b/flagsmith/flagsmith.py
index ea0a764..3452f20 100644
--- a/flagsmith/flagsmith.py
+++ b/flagsmith/flagsmith.py
@@ -292,8 +292,8 @@ def update_environment(self) -> None:
     def _get_headers(
         self,
         environment_key: str,
-        application_metadata: ApplicationMetadata,
-        custom_headers: typing.Optional[typing.Dict[str, typing.Any]] = None,
+        application_metadata: typing.Optional[ApplicationMetadata],
+        custom_headers: typing.Optional[typing.Dict[str, typing.Any]],
     ) -> typing.Dict[str, str]:
         headers = {
             "X-Environment-Key": environment_key,

From 7c64a9f59bb51bfd3ca7f3b2c985e4b464fb3e5f Mon Sep 17 00:00:00 2001
From: Kim Gustyr <kim.gustyr@flagsmith.com>
Date: Mon, 21 Jul 2025 18:20:51 +0100
Subject: [PATCH 4/7] add python version

---
 flagsmith/flagsmith.py  | 7 ++++++-
 tests/test_flagsmith.py | 6 +++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/flagsmith/flagsmith.py b/flagsmith/flagsmith.py
index 3452f20..5ed7404 100644
--- a/flagsmith/flagsmith.py
+++ b/flagsmith/flagsmith.py
@@ -1,4 +1,5 @@
 import logging
+import sys
 import typing
 from datetime import timezone
 
@@ -33,7 +34,11 @@
 
 DEFAULT_API_URL = "https://edge.api.flagsmith.com/api/v1/"
 DEFAULT_REALTIME_API_URL = "https://realtime.flagsmith.com/"
-DEFAULT_USER_AGENT = f"flagsmith-python-client/{__version__} " + default_user_agent()
+DEFAULT_USER_AGENT = (
+    f"flagsmith-python-client/{__version__} "
+    + default_user_agent()
+    + f" python/{sys.version_info.major}.{sys.version_info.minor}"
+)
 
 
 class Flagsmith:
diff --git a/tests/test_flagsmith.py b/tests/test_flagsmith.py
index 9bc0892..4f6e5ff 100644
--- a/tests/test_flagsmith.py
+++ b/tests/test_flagsmith.py
@@ -1,4 +1,5 @@
 import json
+import sys
 import time
 import typing
 import uuid
@@ -722,7 +723,10 @@ def test_custom_feature_error_raised_when_invalid_feature(
 @pytest.fixture
 def default_headers() -> typing.Dict[str, str]:
     return {
-        "User-Agent": f"flagsmith-python-client/{__version__} python-requests/2.32.4",
+        "User-Agent": (
+            f"flagsmith-python-client/{__version__} python-requests/{requests.__version__} "
+            f"python/{sys.version_info.major}.{sys.version_info.minor}"
+        ),
         "Accept-Encoding": "gzip, deflate",
         "Accept": "*/*",
         "Connection": "keep-alive",

From f0607a1a5c1e9e816b6fad3f0b077d90693ca809 Mon Sep 17 00:00:00 2001
From: Kim Gustyr <kim.gustyr@flagsmith.com>
Date: Mon, 21 Jul 2025 20:03:49 +0100
Subject: [PATCH 5/7] move typecheck to CI, bump pre-commit

---
 .github/workflows/pytest.yml |  11 +++
 .pre-commit-config.yaml      |   7 --
 poetry.lock                  | 153 ++++++++++++++++++++++++++++++++---
 pyproject.toml               |   3 +-
 4 files changed, 154 insertions(+), 20 deletions(-)

diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 743f3a7..1233e71 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -32,5 +32,16 @@ jobs:
           pip install poetry
           poetry install --with dev
 
+      # mypy doesn't support Python 3.8, so we run it only for 3.9 and above.
+      # Still check for typing errors for Python 3.8 when running against one of the newer versions.
+      # See https://mypy.readthedocs.io/en/stable/changelog.html#drop-support-for-python-3-8.
+      - name: Check for new typing errors for Python 3.8
+        if: ${{ matrix.python-version == '3.9' }}
+        run: poetry run mypy --strict --python-version 3.8 .
+
+      - name: Check for new typing errors
+        if: ${{ matrix.python-version != '3.8' }}
+        run: poetry run mypy --strict .
+
       - name: Run Tests
         run: poetry run pytest
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index dd1c372..f295f10 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,11 +1,4 @@
 repos:
-  - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.16.1
-    hooks:
-      - id: mypy
-        args: [--strict]
-        additional_dependencies:
-          [pydantic, pytest, pytest_mock, types-requests, flagsmith-flag-engine, responses, sseclient-py]
   - repo: https://github.com/PyCQA/isort
     rev: 6.0.1
     hooks:
diff --git a/poetry.lock b/poetry.lock
index 8b2bdd8..d5b1228 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.8.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.1.3 and should not be changed by hand.
 
 [[package]]
 name = "annotated-types"
@@ -6,6 +6,7 @@ version = "0.7.0"
 description = "Reusable constraint types to use with typing.Annotated"
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "annotated_types-0.7.0-py3-none-any.whl", hash = "sha256:1f02e8b43a8fbbc3f3e0d4f0f4bfc8131bcb4eebe8849b8e5c773f3a1c582a53"},
     {file = "annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89"},
@@ -20,6 +21,7 @@ version = "2024.7.4"
 description = "Python package for providing Mozilla's CA Bundle."
 optional = false
 python-versions = ">=3.6"
+groups = ["main", "dev"]
 files = [
     {file = "certifi-2024.7.4-py3-none-any.whl", hash = "sha256:c198e21b1289c2ab85ee4e67bb4b4ef3ead0892059901a8d5b622f24a1101e90"},
     {file = "certifi-2024.7.4.tar.gz", hash = "sha256:5a1e7645bc0ec61a09e26c36f6106dd4cf40c6db3a1fb6352b0244e7fb057c7b"},
@@ -31,6 +33,8 @@ version = "3.4.0"
 description = "Validate configuration and produce human readable error messages."
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
 files = [
     {file = "cfgv-3.4.0-py2.py3-none-any.whl", hash = "sha256:b7265b1f29fd3316bfcd2b330d63d024f2bfd8bcb8b0272f8e19a504856c48f9"},
     {file = "cfgv-3.4.0.tar.gz", hash = "sha256:e52591d4c5f5dead8e0f673fb16db7949d2cfb3f7da4582893288f0ded8fe560"},
@@ -42,6 +46,7 @@ version = "3.3.2"
 description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
 optional = false
 python-versions = ">=3.7.0"
+groups = ["main", "dev"]
 files = [
     {file = "charset-normalizer-3.3.2.tar.gz", hash = "sha256:f30c3cb33b24454a82faecaf01b19c18562b1e89558fb6c56de4d9118a032fd5"},
     {file = "charset_normalizer-3.3.2-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:25baf083bf6f6b341f4121c2f3c548875ee6f5339300e08be3f2b2ba1721cdd3"},
@@ -141,6 +146,8 @@ version = "0.4.6"
 description = "Cross-platform colored terminal text."
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+groups = ["dev"]
+markers = "sys_platform == \"win32\""
 files = [
     {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
@@ -152,6 +159,7 @@ version = "7.6.1"
 description = "Code coverage measurement for Python"
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
 files = [
     {file = "coverage-7.6.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:b06079abebbc0e89e6163b8e8f0e16270124c154dc6e4a47b413dd538859af16"},
     {file = "coverage-7.6.1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:cf4b19715bccd7ee27b6b120e7e9dd56037b9c0681dcc1adc9ba9db3d417fa36"},
@@ -231,7 +239,7 @@ files = [
 tomli = {version = "*", optional = true, markers = "python_full_version <= \"3.11.0a6\" and extra == \"toml\""}
 
 [package.extras]
-toml = ["tomli"]
+toml = ["tomli ; python_full_version <= \"3.11.0a6\""]
 
 [[package]]
 name = "distlib"
@@ -239,6 +247,8 @@ version = "0.3.8"
 description = "Distribution utilities"
 optional = false
 python-versions = "*"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
 files = [
     {file = "distlib-0.3.8-py2.py3-none-any.whl", hash = "sha256:034db59a0b96f8ca18035f36290806a9a6e6bd9d1ff91e45a7f172eb17e51784"},
     {file = "distlib-0.3.8.tar.gz", hash = "sha256:1530ea13e350031b6312d8580ddb6b27a104275a31106523b8f123787f494f64"},
@@ -250,6 +260,8 @@ version = "1.2.2"
 description = "Backport of PEP 654 (exception groups)"
 optional = false
 python-versions = ">=3.7"
+groups = ["dev"]
+markers = "python_version < \"3.11\""
 files = [
     {file = "exceptiongroup-1.2.2-py3-none-any.whl", hash = "sha256:3111b9d131c238bec2f8f516e123e14ba243563fb135d3fe885990585aa7795b"},
     {file = "exceptiongroup-1.2.2.tar.gz", hash = "sha256:47c2edf7c6738fafb49fd34290706d1a1a2f4d1c6df275526b62cbb4aa5393cc"},
@@ -264,6 +276,8 @@ version = "3.15.4"
 description = "A platform independent file lock."
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
 files = [
     {file = "filelock-3.15.4-py3-none-any.whl", hash = "sha256:6ca1fffae96225dab4c6eaf1c4f4f28cd2568d3ec2a44e15a08520504de468e7"},
     {file = "filelock-3.15.4.tar.gz", hash = "sha256:2207938cbc1844345cb01a5a95524dae30f0ce089eba5b00378295a17e3e90cb"},
@@ -272,7 +286,7 @@ files = [
 [package.extras]
 docs = ["furo (>=2023.9.10)", "sphinx (>=7.2.6)", "sphinx-autodoc-typehints (>=1.25.2)"]
 testing = ["covdefaults (>=2.3)", "coverage (>=7.3.2)", "diff-cover (>=8.0.1)", "pytest (>=7.4.3)", "pytest-asyncio (>=0.21)", "pytest-cov (>=4.1)", "pytest-mock (>=3.12)", "pytest-timeout (>=2.2)", "virtualenv (>=20.26.2)"]
-typing = ["typing-extensions (>=4.8)"]
+typing = ["typing-extensions (>=4.8) ; python_version < \"3.11\""]
 
 [[package]]
 name = "flagsmith-flag-engine"
@@ -280,6 +294,7 @@ version = "5.3.1"
 description = "Flag engine for the Flagsmith API."
 optional = false
 python-versions = "*"
+groups = ["main"]
 files = [
     {file = "flagsmith-flag-engine-5.3.1.tar.gz", hash = "sha256:6f04cd3f8dc8ffed0454d43dc980ac521d52637e8f107eed3dadcfb5a6ee233f"},
 ]
@@ -295,6 +310,8 @@ version = "2.6.0"
 description = "File identification library for Python"
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
 files = [
     {file = "identify-2.6.0-py2.py3-none-any.whl", hash = "sha256:e79ae4406387a9d300332b5fd366d8994f1525e8414984e1a59e058b2eda2dd0"},
     {file = "identify-2.6.0.tar.gz", hash = "sha256:cb171c685bdc31bcc4c1734698736a7d5b6c8bf2e0c15117f4d469c8640ae5cf"},
@@ -309,6 +326,7 @@ version = "3.7"
 description = "Internationalized Domain Names in Applications (IDNA)"
 optional = false
 python-versions = ">=3.5"
+groups = ["main", "dev"]
 files = [
     {file = "idna-3.7-py3-none-any.whl", hash = "sha256:82fee1fc78add43492d3a1898bfa6d8a904cc97d8427f683ed8e798d07761aa0"},
     {file = "idna-3.7.tar.gz", hash = "sha256:028ff3aadf0609c1fd278d8ea3089299412a7a8b9bd005dd08b9f8285bcb5cfc"},
@@ -320,17 +338,89 @@ version = "2.0.0"
 description = "brain-dead simple config-ini parsing"
 optional = false
 python-versions = ">=3.7"
+groups = ["dev"]
 files = [
     {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
     {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
 ]
 
+[[package]]
+name = "mypy"
+version = "1.17.0"
+description = "Optional static typing for Python"
+optional = false
+python-versions = ">=3.9"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
+files = [
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+    {file = "mypy-1.17.0-py3-none-any.whl", hash = "sha256:15d9d0018237ab058e5de3d8fce61b6fa72cc59cc78fd91f1b474bce12abf496"},
+    {file = "mypy-1.17.0.tar.gz", hash = "sha256:e5d7ccc08ba089c06e2f5629c660388ef1fee708444f1dee0b9203fa031dee03"},
+]
+
+[package.dependencies]
+mypy_extensions = ">=1.0.0"
+pathspec = ">=0.9.0"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
+typing_extensions = ">=4.6.0"
+
+[package.extras]
+dmypy = ["psutil (>=4.0)"]
+faster-cache = ["orjson"]
+install-types = ["pip"]
+mypyc = ["setuptools (>=50)"]
+reports = ["lxml"]
+
+[[package]]
+name = "mypy-extensions"
+version = "1.1.0"
+description = "Type system extensions for programs checked with the mypy type checker."
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
+files = [
+    {file = "mypy_extensions-1.1.0-py3-none-any.whl", hash = "sha256:1be4cccdb0f2482337c4743e60421de3a356cd97508abadd57d47403e94f5505"},
+    {file = "mypy_extensions-1.1.0.tar.gz", hash = "sha256:52e68efc3284861e772bbcd66823fde5ae21fd2fdb51c62a211403730b916558"},
+]
+
 [[package]]
 name = "nodeenv"
 version = "1.9.1"
 description = "Node.js virtual environment builder"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
 files = [
     {file = "nodeenv-1.9.1-py2.py3-none-any.whl", hash = "sha256:ba11c9782d29c27c70ffbdda2d7415098754709be8a7056d79a737cd901155c9"},
     {file = "nodeenv-1.9.1.tar.gz", hash = "sha256:6ec12890a2dab7946721edbfbcd91f3319c6ccc9aec47be7c7e6b7011ee6645f"},
@@ -342,17 +432,33 @@ version = "24.1"
 description = "Core utilities for Python packages"
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
 files = [
     {file = "packaging-24.1-py3-none-any.whl", hash = "sha256:5b8f2217dbdbd2f7f384c41c628544e6d52f2d0f53c6d0c3ea61aa5d1d7ff124"},
     {file = "packaging-24.1.tar.gz", hash = "sha256:026ed72c8ed3fcce5bf8950572258698927fd1dbda10a5e981cdf0ac37f4f002"},
 ]
 
+[[package]]
+name = "pathspec"
+version = "0.12.1"
+description = "Utility library for gitignore style pattern matching of file paths."
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
+files = [
+    {file = "pathspec-0.12.1-py3-none-any.whl", hash = "sha256:a0d503e138a4c123b27490a4f7beda6a01c6f288df0e4a8b79c7eb0dc7b4cc08"},
+    {file = "pathspec-0.12.1.tar.gz", hash = "sha256:a482d51503a1ab33b1c67a6c3813a26953dbdc71c31dacaef9a838c4e29f5712"},
+]
+
 [[package]]
 name = "platformdirs"
 version = "4.2.2"
 description = "A small Python package for determining appropriate platform-specific dirs, e.g. a `user data dir`."
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
 files = [
     {file = "platformdirs-4.2.2-py3-none-any.whl", hash = "sha256:2d7a1657e36a80ea911db832a8a6ece5ee53d8de21edd5cc5879af6530b1bfee"},
     {file = "platformdirs-4.2.2.tar.gz", hash = "sha256:38b7b51f512eed9e84a22788b4bce1de17c0adb134d6becb09836e37d8654cd3"},
@@ -369,6 +475,7 @@ version = "1.5.0"
 description = "plugin and hook calling mechanisms for python"
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
 files = [
     {file = "pluggy-1.5.0-py3-none-any.whl", hash = "sha256:44e1ad92c8ca002de6377e165f3e0f1be63266ab4d554740532335b9d75ea669"},
     {file = "pluggy-1.5.0.tar.gz", hash = "sha256:2cffa88e94fdc978c4c574f15f9e59b7f4201d439195c3715ca9e2486f1d0cf1"},
@@ -380,13 +487,15 @@ testing = ["pytest", "pytest-benchmark"]
 
 [[package]]
 name = "pre-commit"
-version = "2.21.0"
+version = "4.2.0"
 description = "A framework for managing and maintaining multi-language pre-commit hooks."
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.9"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
 files = [
-    {file = "pre_commit-2.21.0-py2.py3-none-any.whl", hash = "sha256:e2f91727039fc39a92f58a588a25b87f936de6567eed4f0e673e0507edc75bad"},
-    {file = "pre_commit-2.21.0.tar.gz", hash = "sha256:31ef31af7e474a8d8995027fefdfcf509b5c913ff31f2015b4ec4beb26a6f658"},
+    {file = "pre_commit-4.2.0-py2.py3-none-any.whl", hash = "sha256:a009ca7205f1eb497d10b845e52c838a98b6cdd2102a6c8e4540e94ee75c58bd"},
+    {file = "pre_commit-4.2.0.tar.gz", hash = "sha256:601283b9757afd87d40c4c4a9b2b5de9637a8ea02eaff7adc2d0fb4e04841146"},
 ]
 
 [package.dependencies]
@@ -402,6 +511,7 @@ version = "2.8.2"
 description = "Data validation using Python type hints"
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "pydantic-2.8.2-py3-none-any.whl", hash = "sha256:73ee9fddd406dc318b885c7a2eab8a6472b68b8fb5ba8150949fc3db939f23c8"},
     {file = "pydantic-2.8.2.tar.gz", hash = "sha256:6f62c13d067b0755ad1c21a34bdd06c0c12625a22b0fc09c6b149816604f7c2a"},
@@ -424,6 +534,7 @@ version = "0.6.0"
 description = "Collections of pydantic models"
 optional = false
 python-versions = "*"
+groups = ["main"]
 files = [
     {file = "pydantic_collections-0.6.0-py3-none-any.whl", hash = "sha256:ec559722abf6a0f80e6f00b3d28f0f39c0ed5feb1641166230eb75e9da880162"},
     {file = "pydantic_collections-0.6.0.tar.gz", hash = "sha256:c34d3fd1df5600b315cdecdd8e74eacd4c8c607b7e3f2c9392b2a15850a4ef9e"},
@@ -439,6 +550,7 @@ version = "2.20.1"
 description = "Core functionality for Pydantic validation and serialization"
 optional = false
 python-versions = ">=3.8"
+groups = ["main"]
 files = [
     {file = "pydantic_core-2.20.1-cp310-cp310-macosx_10_12_x86_64.whl", hash = "sha256:3acae97ffd19bf091c72df4d726d552c473f3576409b2a7ca36b2f535ffff4a3"},
     {file = "pydantic_core-2.20.1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:41f4c96227a67a013e7de5ff8f20fb496ce573893b7f4f2707d065907bffdbd6"},
@@ -540,6 +652,7 @@ version = "7.4.4"
 description = "pytest: simple powerful testing with Python"
 optional = false
 python-versions = ">=3.7"
+groups = ["dev"]
 files = [
     {file = "pytest-7.4.4-py3-none-any.whl", hash = "sha256:b090cdf5ed60bf4c45261be03239c2c1c22df034fbffe691abe93cd80cea01d8"},
     {file = "pytest-7.4.4.tar.gz", hash = "sha256:2cf0005922c6ace4a3e2ec8b4080eb0d9753fdc93107415332f50ce9e7994280"},
@@ -562,6 +675,7 @@ version = "4.1.0"
 description = "Pytest plugin for measuring coverage."
 optional = false
 python-versions = ">=3.7"
+groups = ["dev"]
 files = [
     {file = "pytest-cov-4.1.0.tar.gz", hash = "sha256:3904b13dfbfec47f003b8e77fd5b589cd11904a21ddf1ab38a64f204d6a10ef6"},
     {file = "pytest_cov-4.1.0-py3-none-any.whl", hash = "sha256:6ba70b9e97e69fcc3fb45bfeab2d0a138fb65c4d0d6a41ef33983ad114be8c3a"},
@@ -580,6 +694,7 @@ version = "3.14.0"
 description = "Thin-wrapper around the mock package for easier use with pytest"
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
 files = [
     {file = "pytest-mock-3.14.0.tar.gz", hash = "sha256:2719255a1efeceadbc056d6bf3df3d1c5015530fb40cf347c0f9afac88410bd0"},
     {file = "pytest_mock-3.14.0-py3-none-any.whl", hash = "sha256:0b72c38033392a5f4621342fe11e9219ac11ec9d375f8e2a0c164539e0d70f6f"},
@@ -597,6 +712,7 @@ version = "6.0.2"
 description = "YAML parser and emitter for Python"
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
 files = [
     {file = "PyYAML-6.0.2-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:0a9a2848a5b7feac301353437eb7d5957887edbf81d56e903999a75a3d743086"},
     {file = "PyYAML-6.0.2-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:29717114e51c84ddfba879543fb232a6ed60086602313ca38cce623c1d62cfbf"},
@@ -659,6 +775,7 @@ version = "2.32.4"
 description = "Python HTTP for Humans."
 optional = false
 python-versions = ">=3.8"
+groups = ["main", "dev"]
 files = [
     {file = "requests-2.32.4-py3-none-any.whl", hash = "sha256:27babd3cda2a6d50b30443204ee89830707d396671944c998b5975b031ac2b2c"},
     {file = "requests-2.32.4.tar.gz", hash = "sha256:27d0316682c8a29834d3264820024b62a36942083d52caf2f14c0591336d3422"},
@@ -680,6 +797,7 @@ version = "1.0.1"
 description = "Asynchronous Python HTTP for Humans."
 optional = false
 python-versions = "*"
+groups = ["main"]
 files = [
     {file = "requests-futures-1.0.1.tar.gz", hash = "sha256:f55a4ef80070e2858e7d1e73123d2bfaeaf25b93fd34384d8ddf148e2b676373"},
     {file = "requests_futures-1.0.1-py2.py3-none-any.whl", hash = "sha256:4a2f5472e9911a79532137d156aa937cd9cd90fec55677f71b2976d1f7a66d38"},
@@ -697,6 +815,7 @@ version = "0.24.1"
 description = "A utility library for mocking out the `requests` Python library."
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
 files = [
     {file = "responses-0.24.1-py3-none-any.whl", hash = "sha256:a2b43f4c08bfb9c9bd242568328c65a34b318741d3fab884ac843c5ceeb543f9"},
     {file = "responses-0.24.1.tar.gz", hash = "sha256:b127c6ca3f8df0eb9cc82fd93109a3007a86acb24871834c47b77765152ecf8c"},
@@ -708,7 +827,7 @@ requests = ">=2.30.0,<3.0"
 urllib3 = ">=1.25.10,<3.0"
 
 [package.extras]
-tests = ["coverage (>=6.0.0)", "flake8", "mypy", "pytest (>=7.0.0)", "pytest-asyncio", "pytest-cov", "pytest-httpserver", "tomli", "tomli-w", "types-PyYAML", "types-requests"]
+tests = ["coverage (>=6.0.0)", "flake8", "mypy", "pytest (>=7.0.0)", "pytest-asyncio", "pytest-cov", "pytest-httpserver", "tomli ; python_version < \"3.11\"", "tomli-w", "types-PyYAML", "types-requests"]
 
 [[package]]
 name = "semver"
@@ -716,6 +835,7 @@ version = "3.0.2"
 description = "Python helper for Semantic Versioning (https://semver.org)"
 optional = false
 python-versions = ">=3.7"
+groups = ["main"]
 files = [
     {file = "semver-3.0.2-py3-none-any.whl", hash = "sha256:b1ea4686fe70b981f85359eda33199d60c53964284e0cfb4977d243e37cf4bf4"},
     {file = "semver-3.0.2.tar.gz", hash = "sha256:6253adb39c70f6e51afed2fa7152bcd414c411286088fb4b9effb133885ab4cc"},
@@ -727,6 +847,7 @@ version = "1.8.0"
 description = "SSE client for Python"
 optional = false
 python-versions = "*"
+groups = ["main"]
 files = [
     {file = "sseclient-py-1.8.0.tar.gz", hash = "sha256:c547c5c1a7633230a38dc599a21a2dc638f9b5c297286b48b46b935c71fac3e8"},
     {file = "sseclient_py-1.8.0-py2.py3-none-any.whl", hash = "sha256:4ecca6dc0b9f963f8384e9d7fd529bf93dd7d708144c4fb5da0e0a1a926fee83"},
@@ -738,6 +859,8 @@ version = "2.0.1"
 description = "A lil' TOML parser"
 optional = false
 python-versions = ">=3.7"
+groups = ["dev"]
+markers = "python_full_version <= \"3.11.0a6\""
 files = [
     {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
     {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
@@ -749,6 +872,7 @@ version = "2.32.0.20240712"
 description = "Typing stubs for requests"
 optional = false
 python-versions = ">=3.8"
+groups = ["dev"]
 files = [
     {file = "types-requests-2.32.0.20240712.tar.gz", hash = "sha256:90c079ff05e549f6bf50e02e910210b98b8ff1ebdd18e19c873cd237737c1358"},
     {file = "types_requests-2.32.0.20240712-py3-none-any.whl", hash = "sha256:f754283e152c752e46e70942fa2a146b5bc70393522257bb85bd1ef7e019dcc3"},
@@ -763,10 +887,12 @@ version = "4.12.2"
 description = "Backported and Experimental Type Hints for Python 3.8+"
 optional = false
 python-versions = ">=3.8"
+groups = ["main", "dev"]
 files = [
     {file = "typing_extensions-4.12.2-py3-none-any.whl", hash = "sha256:04e5ca0351e0f3f85c6853954072df659d0d13fac324d0072316b67d7794700d"},
     {file = "typing_extensions-4.12.2.tar.gz", hash = "sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8"},
 ]
+markers = {dev = "python_version >= \"3.9\""}
 
 [[package]]
 name = "urllib3"
@@ -774,13 +900,14 @@ version = "2.2.2"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 optional = false
 python-versions = ">=3.8"
+groups = ["main", "dev"]
 files = [
     {file = "urllib3-2.2.2-py3-none-any.whl", hash = "sha256:a448b2f64d686155468037e1ace9f2d2199776e17f0a46610480d311f73e3472"},
     {file = "urllib3-2.2.2.tar.gz", hash = "sha256:dd505485549a7a552833da5e6063639d0d177c04f23bc3864e41e5dc5f612168"},
 ]
 
 [package.extras]
-brotli = ["brotli (>=1.0.9)", "brotlicffi (>=0.8.0)"]
+brotli = ["brotli (>=1.0.9) ; platform_python_implementation == \"CPython\"", "brotlicffi (>=0.8.0) ; platform_python_implementation != \"CPython\""]
 h2 = ["h2 (>=4,<5)"]
 socks = ["pysocks (>=1.5.6,!=1.5.7,<2.0)"]
 zstd = ["zstandard (>=0.18.0)"]
@@ -791,6 +918,8 @@ version = "20.26.6"
 description = "Virtual Python Environment builder"
 optional = false
 python-versions = ">=3.7"
+groups = ["dev"]
+markers = "python_version >= \"3.9\""
 files = [
     {file = "virtualenv-20.26.6-py3-none-any.whl", hash = "sha256:7345cc5b25405607a624d8418154577459c3e0277f5466dd79c49d5e492995f2"},
     {file = "virtualenv-20.26.6.tar.gz", hash = "sha256:280aede09a2a5c317e409a00102e7077c6432c5a38f0ef938e643805a7ad2c48"},
@@ -803,9 +932,9 @@ platformdirs = ">=3.9.1,<5"
 
 [package.extras]
 docs = ["furo (>=2023.7.26)", "proselint (>=0.13)", "sphinx (>=7.1.2,!=7.3)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=23.6)"]
-test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.4)", "pytest-env (>=0.8.2)", "pytest-freezer (>=0.4.8)", "pytest-mock (>=3.11.1)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)", "setuptools (>=68)", "time-machine (>=2.10)"]
+test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.4)", "pytest-env (>=0.8.2)", "pytest-freezer (>=0.4.8) ; platform_python_implementation == \"PyPy\" or platform_python_implementation == \"CPython\" and sys_platform == \"win32\" and python_version >= \"3.13\"", "pytest-mock (>=3.11.1)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)", "setuptools (>=68)", "time-machine (>=2.10) ; platform_python_implementation == \"CPython\""]
 
 [metadata]
-lock-version = "2.0"
+lock-version = "2.1"
 python-versions = ">=3.8.1,<4"
-content-hash = "4da7829338a4d12130b2c2b77dc2804032bab4458a6d95624faeaf64433c7516"
+content-hash = "4e63cf3ee6115e58105337de9da451766f8381bf707134ed383848d4dbeae454"
diff --git a/pyproject.toml b/pyproject.toml
index 1cf9c6d..e09349c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,10 +21,11 @@ pydantic = "^2"
 optional = true
 
 [tool.poetry.group.dev.dependencies]
+mypy = { version = "^1.16.1", python = ">=3.9,<4" }
 pytest = "^7.4.0"
 pytest-cov = "^4.1.0"
 pytest-mock = "^3.6.1"
-pre-commit = "^2.17.0"
+pre-commit = { version = "^4.2.0", python = ">=3.9,<4" }
 responses = "^0.24.1"
 types-requests = "^2.32"
 

From 90f0cd69fb2c302c3574dd39d84041e5ccbfcc1d Mon Sep 17 00:00:00 2001
From: Kim Gustyr <kim.gustyr@flagsmith.com>
Date: Mon, 21 Jul 2025 20:10:13 +0100
Subject: [PATCH 6/7] explicit default headers

---
 tests/test_flagsmith.py | 25 ++++++++++---------------
 1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/tests/test_flagsmith.py b/tests/test_flagsmith.py
index 4f6e5ff..9ad1c84 100644
--- a/tests/test_flagsmith.py
+++ b/tests/test_flagsmith.py
@@ -720,19 +720,6 @@ def test_custom_feature_error_raised_when_invalid_feature(
         flags.is_feature_enabled("non-existing-feature")
 
 
-@pytest.fixture
-def default_headers() -> typing.Dict[str, str]:
-    return {
-        "User-Agent": (
-            f"flagsmith-python-client/{__version__} python-requests/{requests.__version__} "
-            f"python/{sys.version_info.major}.{sys.version_info.minor}"
-        ),
-        "Accept-Encoding": "gzip, deflate",
-        "Accept": "*/*",
-        "Connection": "keep-alive",
-    }
-
-
 @pytest.mark.parametrize(
     "kwargs,expected_headers",
     [
@@ -800,7 +787,6 @@ def default_headers() -> typing.Dict[str, str]:
 )
 @responses.activate()
 def test_flagsmith__init__expected_headers_sent(
-    default_headers: typing.Dict[str, str],
     kwargs: typing.Dict[str, typing.Any],
     expected_headers: typing.Dict[str, str],
 ) -> None:
@@ -813,4 +799,13 @@ def test_flagsmith__init__expected_headers_sent(
 
     # Then
     headers = responses.calls[0].request.headers
-    assert headers == {**default_headers, **expected_headers}
+    assert headers == {
+        "User-Agent": (
+            f"flagsmith-python-client/{__version__} python-requests/{requests.__version__} "
+            f"python/{sys.version_info.major}.{sys.version_info.minor}"
+        ),
+        "Accept-Encoding": "gzip, deflate",
+        "Accept": "*/*",
+        "Connection": "keep-alive",
+        **expected_headers,
+    }

From 23166545903ecb4d800ba141b5185d07074db5ec Mon Sep 17 00:00:00 2001
From: Kim Gustyr <kim.gustyr@flagsmith.com>
Date: Mon, 21 Jul 2025 20:14:58 +0100
Subject: [PATCH 7/7] drop 3.8

---
 .github/workflows/pytest.yml | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 1233e71..8cc83d3 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -32,13 +32,6 @@ jobs:
           pip install poetry
           poetry install --with dev
 
-      # mypy doesn't support Python 3.8, so we run it only for 3.9 and above.
-      # Still check for typing errors for Python 3.8 when running against one of the newer versions.
-      # See https://mypy.readthedocs.io/en/stable/changelog.html#drop-support-for-python-3-8.
-      - name: Check for new typing errors for Python 3.8
-        if: ${{ matrix.python-version == '3.9' }}
-        run: poetry run mypy --strict --python-version 3.8 .
-
       - name: Check for new typing errors
         if: ${{ matrix.python-version != '3.8' }}
         run: poetry run mypy --strict .