Raise explicit error for blank env base URL

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

hyperbrowser/config.py

@@ -51,9 +51,13 @@ def from_env(cls) -> "ClientConfig":
                 "HYPERBROWSER_API_KEY environment variable is required"
             )
 
-        base_url = os.environ.get(
-            "HYPERBROWSER_BASE_URL", "https://api.hyperbrowser.ai"
-        )
+        raw_base_url = os.environ.get("HYPERBROWSER_BASE_URL")
+        if raw_base_url is None:
+            base_url = "https://api.hyperbrowser.ai"
+        elif not raw_base_url.strip():
+            raise HyperbrowserError("HYPERBROWSER_BASE_URL must not be empty when set")
+        else:
+            base_url = raw_base_url
         headers = cls.parse_headers_from_env(os.environ.get("HYPERBROWSER_HEADERS"))
         return cls(api_key=api_key, base_url=base_url, headers=headers)
 

tests/test_config.py

@@ -133,6 +133,16 @@ def test_client_config_from_env_rejects_invalid_base_url(monkeypatch):
         ClientConfig.from_env()
 
 
+def test_client_config_from_env_rejects_blank_base_url(monkeypatch):
+    monkeypatch.setenv("HYPERBROWSER_API_KEY", "test-key")
+    monkeypatch.setenv("HYPERBROWSER_BASE_URL", "   ")
+
+    with pytest.raises(
+        HyperbrowserError, match="HYPERBROWSER_BASE_URL must not be empty"
+    ):
+        ClientConfig.from_env()
+
+
 def test_client_config_from_env_rejects_base_url_without_host(monkeypatch):
     monkeypatch.setenv("HYPERBROWSER_API_KEY", "test-key")
     monkeypatch.setenv("HYPERBROWSER_BASE_URL", "https://")