diff --git a/integration-tests/nghttpx_http1_test.go b/integration-tests/nghttpx_http1_test.go
index b84e3059..80d3b1ca 100644
--- a/integration-tests/nghttpx_http1_test.go
+++ b/integration-tests/nghttpx_http1_test.go
@@ -211,6 +211,41 @@ func TestH1H1HTTP10NoHostRewrite(t *testing.T) {
 	}
 }
 
+// TestH1H1RequestTrailer tests request trailer part is forwarded to
+// backend.
+func TestH1H1RequestTrailer(t *testing.T) {
+	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
+		buf := make([]byte, 4096)
+		for {
+			_, err := r.Body.Read(buf)
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				t.Fatalf("r.Body.Read() = %v", err)
+			}
+		}
+		if got, want := r.Trailer.Get("foo"), "bar"; got != want {
+			t.Errorf("r.Trailer.Get(foo): %v; want %v", got, want)
+		}
+	})
+	defer st.Close()
+
+	res, err := st.http1(requestParam{
+		name: "TestH1H1RequestTrailer",
+		body: []byte("1"),
+		trailer: []hpack.HeaderField{
+			pair("foo", "bar"),
+		},
+	})
+	if err != nil {
+		t.Fatalf("Error st.http1() = %v", err)
+	}
+	if got, want := res.status, 200; got != want {
+		t.Errorf("res.status: %v; want %v", got, want)
+	}
+}
+
 // TestH1H2ConnectFailure tests that server handles the situation that
 // connection attempt to HTTP/2 backend failed.
 func TestH1H2ConnectFailure(t *testing.T) {
diff --git a/integration-tests/nghttpx_http2_test.go b/integration-tests/nghttpx_http2_test.go
index 6d9edf7f..fc1daf54 100644
--- a/integration-tests/nghttpx_http2_test.go
+++ b/integration-tests/nghttpx_http2_test.go
@@ -520,6 +520,41 @@ func TestH2H1ServerPush(t *testing.T) {
 	}
 }
 
+// TestH2H1RequestTrailer tests request trailer part is forwarded to
+// backend.
+func TestH2H1RequestTrailer(t *testing.T) {
+	st := newServerTester(nil, t, func(w http.ResponseWriter, r *http.Request) {
+		buf := make([]byte, 4096)
+		for {
+			_, err := r.Body.Read(buf)
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				t.Fatalf("r.Body.Read() = %v", err)
+			}
+		}
+		if got, want := r.Trailer.Get("foo"), "bar"; got != want {
+			t.Errorf("r.Trailer.Get(foo): %v; want %v", got, want)
+		}
+	})
+	defer st.Close()
+
+	res, err := st.http2(requestParam{
+		name: "TestH2H1RequestTrailer",
+		body: []byte("1"),
+		trailer: []hpack.HeaderField{
+			pair("foo", "bar"),
+		},
+	})
+	if err != nil {
+		t.Fatalf("Error st.http2() = %v", err)
+	}
+	if got, want := res.status, 200; got != want {
+		t.Errorf("res.status: %v; want %v", got, want)
+	}
+}
+
 // TestH2H1GracefulShutdown tests graceful shutdown.
 func TestH2H1GracefulShutdown(t *testing.T) {
 	st := newServerTester(nil, t, noopHandler)
diff --git a/integration-tests/server_tester.go b/integration-tests/server_tester.go
index b8a50300..58a3051a 100644
--- a/integration-tests/server_tester.go
+++ b/integration-tests/server_tester.go
@@ -255,6 +255,27 @@ type requestParam struct {
 	path      string              // path, defaults to /
 	header    []hpack.HeaderField // additional request header fields
 	body      []byte              // request body
+	trailer   []hpack.HeaderField // trailer part
+}
+
+// wrapper for request body to set trailer part
+type chunkedBodyReader struct {
+	trailer        []hpack.HeaderField
+	trailerWritten bool
+	body           io.Reader
+	req            *http.Request
+}
+
+func (cbr *chunkedBodyReader) Read(p []byte) (n int, err error) {
+	// document says that we have to set http.Request.Trailer
+	// after request was sent and before body returns EOF.
+	if !cbr.trailerWritten {
+		cbr.trailerWritten = true
+		for _, h := range cbr.trailer {
+			cbr.req.Trailer.Set(h.Name, h.Value)
+		}
+	}
+	return cbr.body.Read(p)
 }
 
 func (st *serverTester) http1(rp requestParam) (*serverResponse, error) {
@@ -264,8 +285,16 @@ func (st *serverTester) http1(rp requestParam) (*serverResponse, error) {
 	}
 
 	var body io.Reader
+	var cbr *chunkedBodyReader
 	if rp.body != nil {
 		body = bytes.NewBuffer(rp.body)
+		if len(rp.trailer) != 0 {
+			cbr = &chunkedBodyReader{
+				trailer: rp.trailer,
+				body:    body,
+			}
+			body = cbr
+		}
 	}
 	req, err := http.NewRequest(method, st.url, body)
 	if err != nil {
@@ -275,7 +304,15 @@ func (st *serverTester) http1(rp requestParam) (*serverResponse, error) {
 		req.Header.Add(h.Name, h.Value)
 	}
 	req.Header.Add("Test-Case", rp.name)
-
+	if cbr != nil {
+		cbr.req = req
+		// this makes request use chunked encoding
+		req.ContentLength = -1
+		req.Trailer = make(http.Header)
+		for _, h := range cbr.trailer {
+			req.Trailer.Set(h.Name, "")
+		}
+	}
 	if err := req.Write(st.conn); err != nil {
 		return nil, err
 	}
@@ -473,7 +510,7 @@ func (st *serverTester) http2(rp requestParam) (*serverResponse, error) {
 
 	err := st.fr.WriteHeaders(http2.HeadersFrameParam{
 		StreamID:      id,
-		EndStream:     len(rp.body) == 0,
+		EndStream:     len(rp.body) == 0 && len(rp.trailer) == 0,
 		EndHeaders:    true,
 		BlockFragment: st.headerBlkBuf.Bytes(),
 	})
@@ -483,7 +520,23 @@ func (st *serverTester) http2(rp requestParam) (*serverResponse, error) {
 
 	if len(rp.body) != 0 {
 		// TODO we assume rp.body fits in 1 frame
-		if err := st.fr.WriteData(id, true, rp.body); err != nil {
+		if err := st.fr.WriteData(id, len(rp.trailer) == 0, rp.body); err != nil {
+			return nil, err
+		}
+	}
+
+	if len(rp.trailer) != 0 {
+		st.headerBlkBuf.Reset()
+		for _, h := range rp.trailer {
+			_ = st.enc.WriteField(h)
+		}
+		err := st.fr.WriteHeaders(http2.HeadersFrameParam{
+			StreamID:      id,
+			EndStream:     true,
+			EndHeaders:    true,
+			BlockFragment: st.headerBlkBuf.Bytes(),
+		})
+		if err != nil {
 			return nil, err
 		}
 	}