There's no reason not to preload chunked bodies.

Lukasa · Lukasa · commit af94b743f77d · 2015-10-19T13:20:37.000+01:00
diff --git a/urllib3/response.py b/urllib3/response.py
@@ -130,8 +130,8 @@ def __init__(self, body='', headers=None, status=0, version=0, reason=None,
         if "chunked" in encodings:
             self.chunked = True
 
-        # We certainly don't want to preload content when the response is chunked.
-        if not self.chunked and preload_content and not self._body:
+        # If requested, preload the body.
+        if preload_content and not self._body:
             self._body = self.read(decode_content=decode_content)
 
     def get_redirect_location(self):
