Add info about HTTP/1.1 and Connection:Close header.
diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index 0755415..1578968 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -26,7 +26,8 @@
*data* should be a buffer in the standard
:mimetype:`application/x-www-form-urlencoded` format. The
:func:`urllib.parse.urlencode` function takes a mapping or sequence
- of 2-tuples and returns a string in this format.
+ of 2-tuples and returns a string in this format. urllib.request module uses
+ HTTP/1.1 and includes `Connection:close` header in its HTTP requests.
The optional *timeout* parameter specifies a timeout in seconds for
blocking operations like the connection attempt (if not specified,