[v14.x backport] http: don't throw on Uint8Arrays for http.ServerResponse#write

lib/_http_outgoing.js

@@ -61,6 +61,7 @@ const {
   hideStackFrames
 } = require('internal/errors');
 const { validateString } = require('internal/validators');
+const { isUint8Array } = require('internal/util/types');
 
 const HIGH_WATER_MARK = getDefaultHighWaterMark();
 const { CRLF, debug } = common;
@@ -667,9 +668,9 @@ function write_(msg, chunk, encoding, callback, fromEnd) {
     return true;
   }
 
-  if (!fromEnd && typeof chunk !== 'string' && !(chunk instanceof Buffer)) {
+  if (!fromEnd && typeof chunk !== 'string' && !(isUint8Array(chunk))) {
     throw new ERR_INVALID_ARG_TYPE('first argument',
-                                   ['string', 'Buffer'], chunk);
+                                   ['string', 'Buffer', 'Uint8Array'], chunk);
   }
 
   if (!fromEnd && msg.socket && !msg.socket.writableCorked) {

test/parallel/test-http-outgoing-proto.js

@@ -83,7 +83,7 @@ assert.throws(() => {
   code: 'ERR_INVALID_ARG_TYPE',
   name: 'TypeError',
   message: 'The first argument must be of type string or an instance of ' +
-           'Buffer. Received undefined'
+           'Buffer or Uint8Array. Received undefined'
 });
 
 assert.throws(() => {
@@ -93,7 +93,7 @@ assert.throws(() => {
   code: 'ERR_INVALID_ARG_TYPE',
   name: 'TypeError',
   message: 'The first argument must be of type string or an instance of ' +
-           'Buffer. Received type number (1)'
+           'Buffer or Uint8Array. Received type number (1)'
 });
 
 // addTrailers()

test/parallel/test-http-outgoing-write-types.js

@@ -0,0 +1,24 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const http = require('http');
+
+const httpServer = http.createServer(common.mustCall(function(req, res) {
+  httpServer.close();
+  assert.throws(() => {
+    res.write(['Throws.']);
+  }, {
+    code: 'ERR_INVALID_ARG_TYPE'
+  });
+  // should not throw
+  res.write('1a2b3c');
+  // should not throw
+  res.write(new Uint8Array(1024));
+  // should not throw
+  res.write(Buffer.from('1'.repeat(1024)));
+  res.end();
+}));
+
+httpServer.listen(0, common.mustCall(function() {
+  http.get({ port: this.address().port });
+}));