Fix/refactor default cert loading

httpie/compat.py

@@ -1,8 +1,9 @@
 import sys
+from ssl import SSLContext
 from typing import Any, Optional, Iterable
 
 from httpie.cookies import HTTPieCookiePolicy
-from http import cookiejar # noqa
+from http import cookiejar  # noqa
 
 
 # Request does not carry the original policy attached to the
@@ -10,7 +11,6 @@ from http import cookiejar # noqa
 # policy. <https://github.com/psf/requests/issues/5449>
 cookiejar.DefaultCookiePolicy = HTTPieCookiePolicy
 
-
 is_windows = 'win32' in str(sys.platform).lower()
 is_frozen = getattr(sys, 'frozen', False)
 
@@ -66,7 +66,6 @@ except ImportError:
             res = instance.__dict__[self.name] = self.func(instance)
             return res
 
-
 # importlib_metadata was a provisional module, so the APIs changed quite a few times
 # between 3.8-3.10. It was also not included in the standard library until 3.8, so
 # we install the backport for <3.8.
@@ -100,3 +99,15 @@ def get_dist_name(entry_point: importlib_metadata.EntryPoint) -> Optional[str]:
         return None
     else:
         return metadata.get('name')
+
+
+def ensure_default_certs_loaded(ssl_context: SSLContext) -> None:
+    """
+    Workaround for a bug in Requests 2.32.3
+
+    See <https://github.com/httpie/cli/issues/1583>
+
+    """
+    if hasattr(ssl_context, 'load_default_certs'):
+        if not ssl_context.get_ca_certs():
+            ssl_context.load_default_certs()

httpie/ssl_.py

@@ -1,13 +1,15 @@
 import ssl
 from typing import NamedTuple, Optional
 
-from httpie.adapters import HTTPAdapter
 # noinspection PyPackageRequirements
 from urllib3.util.ssl_ import (
     create_urllib3_context,
     resolve_ssl_version,
 )
 
+from .adapters import HTTPAdapter
+from .compat import ensure_default_certs_loaded
+
 
 SSL_VERSION_ARG_MAPPING = {
     'ssl2.3': 'PROTOCOL_SSLv23',
@@ -71,7 +73,7 @@ class HTTPieHTTPSAdapter(HTTPAdapter):
         ssl_version: str = None,
         ciphers: str = None,
     ) -> 'ssl.SSLContext':
-        context = create_urllib3_context(
+        ssl_context = create_urllib3_context(
             ciphers=ciphers,
             ssl_version=resolve_ssl_version(ssl_version),
             # Since we are using a custom SSL context, we need to pass this
@@ -79,11 +81,8 @@ class HTTPieHTTPSAdapter(HTTPAdapter):
             # in `super().cert_verify()`.
             cert_reqs=ssl.CERT_REQUIRED if verify else ssl.CERT_NONE
         )
-        if not context.get_ca_certs():
-            # Workaround for a bug in requests 2.32.3
-            # See <https://github.com/httpie/cli/issues/1583>
-            context.load_default_certs()
-        return context
+        ensure_default_certs_loaded(ssl_context)
+        return ssl_context
 
     @classmethod
     def get_default_ciphers_names(cls):