fix: monkey patch getHeaders for pre-v7 Node.js (GH-1409)

* monkey patch getHeaders
* support new error message format

lib/response.js

@@ -110,15 +110,20 @@ Response.prototype.get = function get(name) {
 };
 
 
-/**
- * retrieves all headers off the response.
- * @public
- * @function getHeaders
- * @returns  {Object}
- */
-Response.prototype.getHeaders = function getHeaders() {
-    return (this._headers || {});
-};
+// If getHeaders is not provided by the Node platform, monkey patch our own.
+// This is needed since versions of Node <7 did not come with a getHeaders.
+// For more see GH-1408
+if (typeof Response.prototype.getHeaders !== 'function') {
+    /**
+     * retrieves all headers off the response.
+     * @public
+     * @function getHeaders
+     * @returns  {Object}
+     */
+    Response.prototype.getHeaders = function getHeaders() {
+        return (this._headers || {});
+    };
+}
 Response.prototype.headers = Response.prototype.getHeaders;
 
 /**

test/response.test.js

@@ -542,7 +542,11 @@ test('GH-951: sendRaw accepts only strings or buffers', function (t) {
 
     SERVER.on('uncaughtException', function (req, res, route, err) {
         t.ok(err);
-        t.equal(err.name, 'AssertionError');
+        // Node v8 uses static error codes
+        // and `name` includes the error name and error code as well which
+        // caused this test to break. Just changing the logic to check for
+        // string instead
+        t.equal((err.name.indexOf('AssertionError') >= 0), true);
         t.equal(err.message, 'res.sendRaw() accepts only strings or buffers');
         t.end();
     });