lib: .end() error fixed

Author: betochf

lib/_http_outgoing.js

@@ -868,12 +868,10 @@ OutgoingMessage.prototype.end = function end(chunk, encoding, callback) {
     if (this.socket) {
       this.socket.cork();
     }
-
-    if (this._byteCount !== this._contentLength) {
+    if (this._contentLength && this._byteCount !== this._contentLength) {
       throw new ERR_CONTENT_LENGTH_MISMATCH(this._contentLength, this._byteCount);
-    } else {
-      write_(this, chunk, encoding, null, true);
     }
+    write_(this, chunk, encoding, null, true);
   } else if (this.finished) {
     if (typeof callback === 'function') {
       if (!this.writableFinished) {