Don't throw on HEAD requests

lib/http.js

@@ -433,7 +433,8 @@ OutgoingMessage.prototype.write = function (chunk, encoding) {
   }
 
   if (!this._hasBody) {
-    throw new Error("This type of response MUST NOT have a body.");
+    console.error("This type of response MUST NOT have a body. Ignoring write() calls.");
+    return true;
   }
 
   if (typeof chunk !== "string"