whatsnew: http.server send_error explain parameter.
Also rewrote the send_error description for clarity and correct English.
diff --git a/Doc/whatsnew/3.4.rst b/Doc/whatsnew/3.4.rst
index 7d7c2b3..6681eba 100644
--- a/Doc/whatsnew/3.4.rst
+++ b/Doc/whatsnew/3.4.rst
@@ -684,6 +684,18 @@
(Contributed by Ezio Melotti in :issue:`15114`)
+http
+----
+
+:meth:`~http.server.BaseHTTPRequestHandler.send_error` now accepts an
+optional additional *exaplain* parameter which can be used to provide an
+extended error description, overriding the hardcoded default if there is one.
+This extended error description will be formatted using the
+:attr:`~http.server.HTTP.error_message_format` attribute and sent as the body
+of the error response. (Contributed by Karl Cow in :issue:`12921`.)
+
+
+
importlib
---------