remove unecessary PING frame sent after publish a message

misc/spec/subscriber/websocket_spec.rb

@@ -320,7 +320,7 @@ describe "Subscriber WebSocket" do
       socket.print(frame)
 
       body, dummy = read_response_on_socket(socket, "ch1")
-      expect(body).to eql("\211\000\x81.{\"channel\":\"ch2\", \"id\":\"1\", \"message\":\"hello\"}\x81.{\"channel\":\"ch1\", \"id\":\"1\", \"message\":\"hello\"}")
+      expect(body).to eql("\x81.{\"channel\":\"ch2\", \"id\":\"1\", \"message\":\"hello\"}\x81.{\"channel\":\"ch1\", \"id\":\"1\", \"message\":\"hello\"}")
       socket.close
 
       EventMachine.run do

src/ngx_http_push_stream_module_websocket.c

@@ -302,7 +302,6 @@ ngx_http_push_stream_websocket_reading(ngx_http_request_t *r)
                                 goto finalize;
                             }
                         }
-                        ngx_http_push_stream_send_response_text(r, NGX_HTTP_PUSH_STREAM_WEBSOCKET_PING_LAST_FRAME_BYTE, sizeof(NGX_HTTP_PUSH_STREAM_WEBSOCKET_PING_LAST_FRAME_BYTE), 1);
                     }
 
                     if (ctx->temp_pool != NULL) {