1 files changed, 3 insertions, 3 deletions
diff --git a/lib/_http_server.js b/lib/_http_server.js
index 20012a5ab1..d8b9799438 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -153,7 +153,7 @@ ServerResponse.prototype._implicitHeader = function() {
 ServerResponse.prototype.writeHead = function(statusCode, reason, obj) {
   var headers;
 
-  if (util.isString(reason)) {
+  if (typeof reason === 'string') {
     // writeHead(statusCode, reasonPhrase[, headers])
     this.statusMessage = reason;
   } else {
@@ -297,7 +297,7 @@ function connectionListener(socket) {
   parser.incoming = null;
 
   // Propagate headers limit from server instance to parser
-  if (util.isNumber(this.maxHeadersCount)) {
+  if (typeof this.maxHeadersCount === 'number') {
     parser.maxHeaderPairs = this.maxHeadersCount << 1;
   } else {
     // Set default value because parser may be reused from FreeList
@@ -455,7 +455,7 @@ function connectionListener(socket) {
       }
     }
 
-    if (!util.isUndefined(req.headers.expect) &&
+    if (req.headers.expect !== undefined &&
         (req.httpVersionMajor == 1 && req.httpVersionMinor == 1) &&
         continueExpression.test(req.headers['expect'])) {
       res._expect_continue = true;