Issue #27895: Spelling fixes (Contributed by Ville Skyttä).
diff --git a/Lib/http/client.py b/Lib/http/client.py
index 350313e..25ae588 100644
--- a/Lib/http/client.py
+++ b/Lib/http/client.py
@@ -136,7 +136,7 @@
#
# VCHAR defined in http://tools.ietf.org/html/rfc5234#appendix-B.1
-# the patterns for both name and value are more leniant than RFC
+# the patterns for both name and value are more lenient than RFC
# definitions to allow for backwards compatibility
_is_legal_header_name = re.compile(rb'[^:\s][^:\r\n]*').fullmatch
_is_illegal_header_value = re.compile(rb'\n(?![ \t])|\r(?![ \t\n])').search