1 files changed, 5 insertions, 5 deletions
diff --git a/lib/_http_server.js b/lib/_http_server.js
index f6cfa3543c..4c7f92d9e3 100644
--- a/lib/_http_server.js
+++ b/lib/_http_server.js
@@ -173,7 +173,7 @@ ServerResponse.prototype._implicitHeader = function() {
 ServerResponse.prototype.writeHead = function(statusCode) {
   var reasonPhrase, headers, headerIndex;
 
-  if (typeof arguments[1] == 'string') {
+  if (IS_STRING(arguments[1])) {
     reasonPhrase = arguments[1];
     headerIndex = 2;
   } else {
@@ -188,13 +188,13 @@ ServerResponse.prototype.writeHead = function(statusCode) {
     // Slow-case: when progressive API and header fields are passed.
     headers = this._renderHeaders();
 
-    if (Array.isArray(obj)) {
+    if (IS_ARRAY(obj)) {
       // handle array case
       // TODO: remove when array is no longer accepted
       var field;
       for (var i = 0, len = obj.length; i < len; ++i) {
         field = obj[i][0];
-        if (headers[field] !== undefined) {
+        if (!IS_UNDEFINED(headers[field])) {
           obj.push([field, headers[field]]);
         }
       }
@@ -332,7 +332,7 @@ function connectionListener(socket) {
   parser.incoming = null;
 
   // Propagate headers limit from server instance to parser
-  if (typeof this.maxHeadersCount === 'number') {
+  if (IS_NUMBER(this.maxHeadersCount)) {
     parser.maxHeaderPairs = this.maxHeadersCount << 1;
   } else {
     // Set default value because parser may be reused from FreeList
@@ -442,7 +442,7 @@ function connectionListener(socket) {
       }
     });
 
-    if (req.headers.expect !== undefined &&
+    if (!IS_UNDEFINED(req.headers.expect) &&
         (req.httpVersionMajor == 1 && req.httpVersionMinor == 1) &&
         continueExpression.test(req.headers['expect'])) {
       res._expect_continue = true;