http: make sure to pass encoding to Buffer.byteLength

Author: ronag

lib/_http_outgoing.js

@@ -893,7 +893,7 @@ function write_(msg, chunk, encoding, callback, fromEnd) {
 
   if (!msg._header) {
     if (fromEnd) {
-      len ??= typeof chunk === 'string' ? Buffer.byteLength(chunk) : chunk.byteLength;
+      len ??= typeof chunk === 'string' ? Buffer.byteLength(chunk, encoding) : chunk.byteLength;
       msg._contentLength = len;
     }
     msg._implicitHeader();