Allow for either getOutpuStream or getWriter to be used before sendRedirect is called.

Author: reversefold

core/src/main/java/org/kohsuke/stapler/ResponseImpl.java

@@ -118,6 +118,15 @@ private <T extends PrintWriter> T recordOutput(T obj) {
         return obj;
     }
 
+    private void closeOutput() throws IOException {
+        if (mode == OutputMode.BYTE) {
+            getOutputStream().close();
+        } else if (mode == OutputMode.CHAR) {
+            getWriter().close();
+        }
+
+    }
+
     public void forward(Object it, String url, StaplerRequest request) throws ServletException, IOException {
         stapler.invoke(request, response, it, url);
     }
@@ -190,7 +199,7 @@ public void sendRedirect(int statusCode, @Nonnull String url) throws IOException
 
         setStatus(statusCode);
         setHeader("Location",url);
-        getOutputStream().close();
+        closeOutput();
     }