diff --git a/src/asio_client_request.cc b/src/asio_client_request.cc
index 0db73c59..4e2ee6a1 100644
--- a/src/asio_client_request.cc
+++ b/src/asio_client_request.cc
@@ -38,7 +38,7 @@ request::request() : impl_(make_unique<request_impl>()) {}
 
 request::~request() {}
 
-void request::cancel() const { impl_->cancel(); }
+void request::cancel(uint32_t error_code) const { impl_->cancel(error_code); }
 
 void request::on_response(response_cb cb) const {
   impl_->on_response(std::move(cb));
diff --git a/src/asio_client_request_impl.cc b/src/asio_client_request_impl.cc
index 10a17e3f..a29d1917 100644
--- a/src/asio_client_request_impl.cc
+++ b/src/asio_client_request_impl.cc
@@ -33,7 +33,7 @@ namespace client {
 
 request_impl::request_impl() : strm_(nullptr) {}
 
-void request_impl::cancel() { strm_->cancel(); }
+void request_impl::cancel(uint32_t error_code) { strm_->cancel(error_code); }
 
 void request_impl::on_response(response_cb cb) { response_cb_ = std::move(cb); }
 
diff --git a/src/asio_client_request_impl.h b/src/asio_client_request_impl.h
index f9e6b67f..176715f1 100644
--- a/src/asio_client_request_impl.h
+++ b/src/asio_client_request_impl.h
@@ -43,7 +43,7 @@ public:
   request_impl(const request_impl &) = delete;
   request_impl &operator=(const request_impl &) = delete;
 
-  void cancel();
+  void cancel(uint32_t error_code);
 
   void on_response(response_cb cb);
   void call_on_response(response &res);
diff --git a/src/asio_client_session_impl.cc b/src/asio_client_session_impl.cc
index 2b60280a..c1b19f97 100644
--- a/src/asio_client_session_impl.cc
+++ b/src/asio_client_session_impl.cc
@@ -44,11 +44,11 @@ session_impl::session_impl(boost::asio::io_service &io_service)
       writing_(false), inside_callback_(false) {}
 
 session_impl::~session_impl() {
-  // finish up all active stream with CANCEL error code
+  // finish up all active stream
   for (auto &p : streams_) {
     auto &strm = p.second;
     auto &req = strm->request().impl();
-    req.call_on_close(NGHTTP2_CANCEL);
+    req.call_on_close(NGHTTP2_INTERNAL_ERROR);
   }
 
   nghttp2_session_del(session_);
@@ -321,9 +321,9 @@ bool session_impl::setup_session() {
   return true;
 }
 
-void session_impl::cancel(stream &strm) {
+void session_impl::cancel(stream &strm, uint32_t error_code) {
   nghttp2_submit_rst_stream(session_, NGHTTP2_FLAG_NONE, strm.stream_id(),
-                            NGHTTP2_CANCEL);
+                            error_code);
   signal_write();
 }
 
diff --git a/src/asio_client_session_impl.h b/src/asio_client_session_impl.h
index 7a84a2e3..55042960 100644
--- a/src/asio_client_session_impl.h
+++ b/src/asio_client_session_impl.h
@@ -53,7 +53,7 @@ public:
   const connect_cb &on_connect() const;
   const error_cb &on_error() const;
 
-  void cancel(stream &strm);
+  void cancel(stream &strm, uint32_t error_code);
 
   std::unique_ptr<stream> create_stream();
   std::unique_ptr<stream> pop_stream(int32_t stream_id);
diff --git a/src/asio_client_stream.cc b/src/asio_client_stream.cc
index 0b32e52b..80de501a 100644
--- a/src/asio_client_stream.cc
+++ b/src/asio_client_stream.cc
@@ -36,7 +36,7 @@ stream::stream(session_impl *sess) : sess_(sess), stream_id_(0) {
   request_.impl().stream(this);
 }
 
-void stream::cancel() { sess_->cancel(*this); }
+void stream::cancel(uint32_t error_code) { sess_->cancel(*this, error_code); }
 
 void stream::stream_id(int32_t stream_id) { stream_id_ = stream_id; }
 
diff --git a/src/asio_client_stream.h b/src/asio_client_stream.h
index 51fe9a8f..db9e075e 100644
--- a/src/asio_client_stream.h
+++ b/src/asio_client_stream.h
@@ -44,7 +44,7 @@ public:
   stream(const stream &) = delete;
   stream &operator=(const stream &) = delete;
 
-  void cancel();
+  void cancel(uint32_t error_code);
 
   void stream_id(int32_t stream_id);
   int32_t stream_id() const;
diff --git a/src/asio_http2_handler.cc b/src/asio_http2_handler.cc
index 3437b0f1..334be504 100644
--- a/src/asio_http2_handler.cc
+++ b/src/asio_http2_handler.cc
@@ -65,7 +65,7 @@ void response::end(read_cb cb) const { impl_->end(std::move(cb)); }
 
 void response::on_close(close_cb cb) const { impl_->on_close(std::move(cb)); }
 
-void response::cancel() const { impl_->cancel(); }
+void response::cancel(uint32_t error_code) const { impl_->cancel(error_code); }
 
 const response *response::push(boost::system::error_code &ec,
                                std::string method, std::string path,
@@ -145,10 +145,10 @@ void response_impl::call_on_close(uint32_t error_code) {
   }
 }
 
-void response_impl::cancel() {
+void response_impl::cancel(uint32_t error_code) {
   auto handler = stream_->handler();
 
-  handler->stream_error(stream_->get_stream_id(), NGHTTP2_CANCEL);
+  handler->stream_error(stream_->get_stream_id(), error_code);
 }
 
 void response_impl::start_response() {
diff --git a/src/asio_http2_handler.h b/src/asio_http2_handler.h
index c8d49898..84c204ad 100644
--- a/src/asio_http2_handler.h
+++ b/src/asio_http2_handler.h
@@ -79,7 +79,7 @@ public:
   void on_close(close_cb cb);
   void resume();
 
-  void cancel();
+  void cancel(uint32_t error_code);
 
   response *push(boost::system::error_code &ec, std::string method,
                  std::string raw_path_query, header_map h = {}) const;
diff --git a/src/includes/nghttp2/asio_http2_client.h b/src/includes/nghttp2/asio_http2_client.h
index 02bae8c6..de15430e 100644
--- a/src/includes/nghttp2/asio_http2_client.h
+++ b/src/includes/nghttp2/asio_http2_client.h
@@ -72,7 +72,7 @@ public:
   void on_push(request_cb cb) const;
   void on_close(close_cb cb) const;
 
-  void cancel() const;
+  void cancel(uint32_t error_code = NGHTTP2_INTERNAL_ERROR) const;
 
   const std::string &method() const;
 
diff --git a/src/includes/nghttp2/asio_http2_server.h b/src/includes/nghttp2/asio_http2_server.h
index f669fa64..ee7f3f55 100644
--- a/src/includes/nghttp2/asio_http2_server.h
+++ b/src/includes/nghttp2/asio_http2_server.h
@@ -80,7 +80,7 @@ public:
 
   void on_close(close_cb cb) const;
 
-  void cancel() const;
+  void cancel(uint32_t error_code = NGHTTP2_INTERNAL_ERROR) const;
 
   // Resumes deferred response.
   void resume() const;