diff --git a/slack/web/async_slack_response.py b/slack/web/async_slack_response.py
index c629705b7..9f65c733d 100644
--- a/slack/web/async_slack_response.py
+++ b/slack/web/async_slack_response.py
@@ -80,6 +80,9 @@ def __str__(self):
             )
         return f"{self.data}"
 
+    def __contains__(self, key: str) -> bool:
+        return self.get(key) is not None
+
     def __getitem__(self, key):
         """Retrieves any key from the data store.
 
diff --git a/slack_sdk/web/async_slack_response.py b/slack_sdk/web/async_slack_response.py
index 268ca5401..e9e1a3413 100644
--- a/slack_sdk/web/async_slack_response.py
+++ b/slack_sdk/web/async_slack_response.py
@@ -81,6 +81,9 @@ def __str__(self):
             )
         return f"{self.data}"
 
+    def __contains__(self, key: str) -> bool:
+        return self.get(key) is not None
+
     def __getitem__(self, key):
         """Retrieves any key from the data store.
 
diff --git a/slack_sdk/web/slack_response.py b/slack_sdk/web/slack_response.py
index 199c9920b..0fc9408ba 100644
--- a/slack_sdk/web/slack_response.py
+++ b/slack_sdk/web/slack_response.py
@@ -81,6 +81,9 @@ def __str__(self):
             )
         return f"{self.data}"
 
+    def __contains__(self, key: str) -> bool:
+        return self.get(key) is not None
+
     def __getitem__(self, key):
         """Retrieves any key from the data store.
 
diff --git a/tests/slack_sdk/web/test_slack_response.py b/tests/slack_sdk/web/test_slack_response.py
index 9b1f655ad..bb34d7c2d 100644
--- a/tests/slack_sdk/web/test_slack_response.py
+++ b/tests/slack_sdk/web/test_slack_response.py
@@ -43,3 +43,17 @@ def test_issue_1100(self):
 
         foo = response.get("foo")
         self.assertIsNone(foo)
+
+    # https://github.com/slackapi/python-slack-sdk/issues/1102
+    def test_issue_1102(self):
+        response = SlackResponse(
+            client=WebClient(token="xoxb-dummy"),
+            http_verb="POST",
+            api_url="http://localhost:3000/api.test",
+            req_args={},
+            data={"ok": True, "args": {"hello": "world"}},
+            headers={},
+            status_code=200,
+        )
+        self.assertTrue("ok" in response)
+        self.assertTrue("foo" not in response)
diff --git a/tests/slack_sdk_async/web/test_async_slack_response.py b/tests/slack_sdk_async/web/test_async_slack_response.py
index a4036a91e..f2820375b 100644
--- a/tests/slack_sdk_async/web/test_async_slack_response.py
+++ b/tests/slack_sdk_async/web/test_async_slack_response.py
@@ -1,6 +1,6 @@
 import unittest
 
-from slack.web.async_slack_response import AsyncSlackResponse
+from slack_sdk.web.async_slack_response import AsyncSlackResponse
 from slack_sdk.web.async_client import AsyncWebClient
 
 
@@ -27,3 +27,17 @@ def test_issue_1100(self):
 
         foo = response.get("foo")
         self.assertIsNone(foo)
+
+    # https://github.com/slackapi/python-slack-sdk/issues/1102
+    def test_issue_1102(self):
+        response = AsyncSlackResponse(
+            client=AsyncWebClient(token="xoxb-dummy"),
+            http_verb="POST",
+            api_url="http://localhost:3000/api.test",
+            req_args={},
+            data={"ok": True, "args": {"hello": "world"}},
+            headers={},
+            status_code=200,
+        )
+        self.assertTrue("ok" in response)
+        self.assertTrue("foo" not in response)