fix: allow requests to respect the environment

Used for certs, for now.

pystac_client/stac_api_io.py

@@ -209,7 +209,10 @@ def request(
             if self.timeout is not None:
                 msg += f" Timeout: {self.timeout}"
             logger.debug(msg)
-            resp = self.session.send(prepped, timeout=self.timeout)
+            send_kwargs = self.session.merge_environment_settings(
+                prepped.url, proxies={}, stream=None, verify=True, cert=None
+            )
+            resp = self.session.send(prepped, timeout=self.timeout, **send_kwargs)
         except Exception as err:
             logger.debug(err)
             raise APIError(str(err))

tests/test_stac_api_io.py

@@ -3,6 +3,7 @@
 from urllib.parse import parse_qs, urlsplit
 
 import pytest
+from pytest import MonkeyPatch
 from requests_mock.mocker import Mocker
 
 from pystac_client.exceptions import APIError
@@ -266,3 +267,10 @@ def test_timeout_smoke_test(self) -> None:
         stac_api_io = StacApiIO(timeout=42)
         response = stac_api_io.read_text(STAC_URLS["PLANETARY-COMPUTER"])
         assert isinstance(response, str)
+
+    @pytest.mark.parametrize("name", ("REQUESTS_CA_BUNDLE", "CURL_CA_BUNDLE"))
+    def test_respect_env_for_certs(self, monkeypatch: MonkeyPatch, name: str) -> None:
+        monkeypatch.setenv(name, "/not/a/real/file")
+        stac_api_io = StacApiIO()
+        with pytest.raises(APIError):
+            stac_api_io.request("https://earth-search.aws.element84.com/v1/")