Fix http.ClientRequest crashes if end() was called twice

Fixes #1417.
Fixes #1223.

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/http2.js b/lib/http2.js
index 55b43282e9e..bc87442f64f 100644
--- a/lib/http2.js
+++ b/lib/http2.js
@@ -648,6 +648,9 @@ OutgoingMessage.prototype.addTrailers = function(headers) {
 
 
 OutgoingMessage.prototype.end = function(data, encoding) {
+  if (this.finished) {
+    return false;
+  }
   if (!this._header) {
     this._implicitHeader();
   }