Use mimic-response

package.json

@@ -28,7 +28,9 @@
     "url": "https://github.com/lukechilds/clone-response/issues"
   },
   "homepage": "https://github.com/lukechilds/clone-response",
-  "dependencies": {},
+  "dependencies": {
+    "mimic-response": "^1.0.0"
+  },
   "devDependencies": {
     "ava": "^0.19.1",
     "coveralls": "^2.13.1",

src/index.js

@@ -1,46 +1,13 @@
 'use strict';
 
 const PassThrough = require('stream').PassThrough;
-
-// We define these manually to ensure they're always copied
-// even if they would move up the prototype chain
-// https://nodejs.org/api/http.html#http_class_http_incomingmessage
-const knownProps = [
-	'destroy',
-	'setTimeout',
-	'socket',
-	'headers',
-	'trailers',
-	'rawHeaders',
-	'statusCode',
-	'httpVersion',
-	'httpVersionMinor',
-	'httpVersionMajor',
-	'rawTrailers',
-	'statusMessage'
-];
-
-const copyProps = (fromStream, toStream) => {
-	const toProps = Object.keys(toStream);
-	const fromProps = new Set(Object.keys(fromStream).concat(knownProps));
-
-	for (const prop of fromProps) {
-		// Don't overwrite existing properties
-		if (toProps.indexOf(prop) !== -1) {
-			continue;
-		}
-
-		toStream[prop] = typeof fromStream[prop] === 'function' ? fromStream[prop].bind(fromStream) : fromStream[prop];
-	}
-};
+const mimicResponse = require('mimic-response');
 
 const cloneResponse = response => {
 	const clone = new PassThrough();
-	copyProps(response, clone);
+	mimicResponse(response, clone);
 
 	return response.pipe(clone);
 };
 
-cloneResponse.knownProps = knownProps;
-
 module.exports = cloneResponse;

test/clone-response.js

@@ -41,13 +41,6 @@ test('streaming multiple cloned responses succeeds', async t => {
 	t.is(clonedStream, responseText);
 });
 
-test('known properties are copied over', async t => {
-	const response = await get(s.url + '/');
-	const clonedResponse = cloneResponse(response);
-
-	cloneResponse.knownProps.forEach(prop => t.true(typeof clonedResponse[prop] !== 'undefined'));
-});
-
 test('custom properties are copied over', async t => {
 	const response = await get(s.url + '/');
 	response.foo = 'bar';