Fix CI on Android and iOS

Author: StanFromIreland

Lib/email/_header_value_parser.py

@@ -796,6 +796,10 @@ def params(self):
                         value = urllib.parse.unquote(value, encoding='latin-1')
                     else:
                         try:
+                            # Explicitly look up the codec for warning generation, see gh-140030
+                            # Can be removed in 3.17
+                            import codecs
+                            codecs.lookup(charset)
                             value = value.decode(charset, 'surrogateescape')
                         except (LookupError, UnicodeEncodeError):
                             # XXX: there should really be a custom defect for

Lib/email/utils.py

@@ -460,6 +460,10 @@ def collapse_rfc2231_value(value, errors='replace',
         charset = fallback_charset
     rawbytes = bytes(text, 'raw-unicode-escape')
     try:
+        # Explicitly look up the codec for warning generation, see gh-140030
+        # Can be removed in 3.17
+        import codecs
+        codecs.lookup(charset)
         return str(rawbytes, charset, errors)
     except LookupError:
         # charset is not a known codec.