diff --git a/lib/http.js b/lib/http.js
index 8c9a850f91..fee73d2b02 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -605,7 +605,7 @@ ServerResponse.prototype.writeHeader = function () {
 function ClientRequest (socket, method, url, headers) {
   OutgoingMessage.call(this, socket);
 
-  this.method = method;
+  this.method = method = method.toUpperCase();
   this.shouldKeepAlive = false;
   if (method === "GET" || method === "HEAD") {
     this.useChunkedEncodingByDefault = false;