HttpServer: Fix left_connhd_len_ is not updated

src/HttpServer.cc

@@ -271,6 +271,7 @@ void connhd_readcb(bufferevent *bev, void *ptr)
     return;
   }
   leftlen -= readlen;
+  handler->set_left_connhd_len(leftlen);
   if(leftlen == 0) {
     bufferevent_setcb(bev, readcb, writecb, eventcb, ptr);
     // Run on_read to process data left in buffer since they are not
@@ -507,6 +508,11 @@ size_t Http2Handler::get_left_connhd_len() const
   return left_connhd_len_;
 }
 
+void Http2Handler::set_left_connhd_len(size_t left)
+{
+  left_connhd_len_ = left;
+}
+
 namespace {
 ssize_t hd_send_callback(nghttp2_session *session,
                          const uint8_t *data, size_t len, int flags,

src/HttpServer.h

@@ -111,6 +111,7 @@ public:
   Sessions* get_sessions() const;
   const Config* get_config() const;
   size_t get_left_connhd_len() const;
+  void set_left_connhd_len(size_t left);
 private:
   nghttp2_session *session_;
   Sessions *sessions_;