Expose base classes for alternate backends (#178)

diff --git a/httpx/__init__.py b/httpx/__init__.py
index 8de5276ec4e3faa5663c3a29e2ff025d422ba552..fd1744120254d474d773ed1236c3a72b53c4d5c7 100644 (file)
--- a/httpx/__init__.py
+++ b/httpx/__init__.py
@@ -34,6 +34,8 @@ from .interfaces import (
     AsyncDispatcher,
     BaseReader,
     BaseWriter,
+    BaseBackgroundManager,
+    BasePoolSemaphore,
     ConcurrencyBackend,
     Dispatcher,
     Protocol,