add trailing slash to the end of the url (#1594)

* add trailing slash to the end of the url

* removing commented lines

* adding trailing slash to legacy_base_client.py

---------

Co-authored-by: Kazuhiro Sera <[email protected]>

slack_sdk/web/async_base_client.py

@@ -46,6 +46,8 @@ def __init__(
     ):
         self.token = None if token is None else token.strip()
         """A string specifying an `xoxp-*` or `xoxb-*` token."""
+        if not base_url.endswith("/"):
+            base_url += "/"
         self.base_url = base_url
         """A string representing the Slack API base URL.
         Default is `'https://slack.com/api/'`."""

slack_sdk/web/base_client.py

@@ -59,6 +59,8 @@ def __init__(
     ):
         self.token = None if token is None else token.strip()
         """A string specifying an `xoxp-*` or `xoxb-*` token."""
+        if not base_url.endswith("/"):
+            base_url += "/"
         self.base_url = base_url
         """A string representing the Slack API base URL.
         Default is `'https://slack.com/api/'`."""

slack_sdk/web/legacy_base_client.py

@@ -62,6 +62,8 @@ def __init__(
     ):
         self.token = None if token is None else token.strip()
         """A string specifying an `xoxp-*` or `xoxb-*` token."""
+        if not base_url.endswith("/"):
+            base_url += "/"
         self.base_url = base_url
         """A string representing the Slack API base URL.
         Default is `'https://slack.com/api/'`."""

tests/slack_sdk/web/test_web_client.py

@@ -229,3 +229,11 @@ def test_user_auth_blocks(self):
             user_auth_blocks=[DividerBlock(), DividerBlock()],
         )
         self.assertIsNone(new_message.get("error"))
+
+    def test_base_url_appends_trailing_slash_issue_15141(self):
+        client = self.client
+        self.assertEqual(client.base_url, "http://localhost:8888/")
+
+    def test_base_url_preserves_trailing_slash_issue_15141(self):
+        client = WebClient(base_url="http://localhost:8888/")
+        self.assertEqual(client.base_url, "http://localhost:8888/")