Updated dependencies and added avct/uasurfer (#8089)

* Updated dependencies and added avct/uasurfer

* Added uasurfer to NOTICE.txt

vendor/github.com/NYTimes/gziphandler/gzip.go

@@ -82,7 +82,14 @@ type GzipResponseWriter struct {
 	buf     []byte // Holds the first part of the write before reaching the minSize or the end of the write.
 
 	contentTypes []string // Only compress if the response is one of these content-types. All are accepted if empty.
-	flushed      bool     // Indicate if the stream was already flushed
+}
+
+type GzipResponseWriterWithCloseNotify struct {
+	*GzipResponseWriter
+}
+
+func (w *GzipResponseWriterWithCloseNotify) CloseNotify() <-chan bool {
+	return w.ResponseWriter.(http.CloseNotifier).CloseNotify()
 }
 
 // Write appends data to the gzip writer.
@@ -170,8 +177,7 @@ func (w *GzipResponseWriter) init() {
 func (w *GzipResponseWriter) Close() error {
 	if w.gw == nil {
 		// Gzip not trigged yet, write out regular response.
-		// WriteHeader only if it wasn't already wrote by a Flush
-		if !w.flushed && w.code != 0 {
+		if w.code != 0 {
 			w.ResponseWriter.WriteHeader(w.code)
 		}
 		if w.buf != nil {
@@ -194,16 +200,18 @@ func (w *GzipResponseWriter) Close() error {
 // http.ResponseWriter if it is an http.Flusher. This makes GzipResponseWriter
 // an http.Flusher.
 func (w *GzipResponseWriter) Flush() {
-	if w.gw != nil {
-		w.gw.Flush()
+	if w.gw == nil {
+		// Only flush once startGzip has been called.
+		//
+		// Flush is thus a no-op until the written body
+		// exceeds minSize.
+		return
 	}
 
+	w.gw.Flush()
+
 	if fw, ok := w.ResponseWriter.(http.Flusher); ok {
-		if !w.flushed && w.code != 0 {
-			w.ResponseWriter.WriteHeader(w.code)
-		}
 		fw.Flush()
-		w.flushed = true
 	}
 }
 
@@ -264,7 +272,6 @@ func GzipHandlerWithOpts(opts ...option) (func(http.Handler) http.Handler, error
 
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			w.Header().Add(vary, acceptEncoding)
-
 			if acceptsGzip(r) {
 				gw := &GzipResponseWriter{
 					ResponseWriter: w,
@@ -274,7 +281,13 @@ func GzipHandlerWithOpts(opts ...option) (func(http.Handler) http.Handler, error
 				}
 				defer gw.Close()
 
-				h.ServeHTTP(gw, r)
+				if _, ok := w.(http.CloseNotifier); ok {
+					gwcn := GzipResponseWriterWithCloseNotify{gw}
+					h.ServeHTTP(gwcn, r)
+				} else {
+					h.ServeHTTP(gw, r)
+				}
+
 			} else {
 				h.ServeHTTP(w, r)
 			}

vendor/github.com/NYTimes/gziphandler/gzip_test.go

@@ -306,23 +306,58 @@ func TestStatusCodes(t *testing.T) {
 	}
 }
 
-func TestStatusCodesFlushed(t *testing.T) {
+func TestFlushBeforeWrite(t *testing.T) {
+	b := []byte(testBody)
 	handler := GzipHandler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
 		rw.WriteHeader(http.StatusNotFound)
 		rw.(http.Flusher).Flush()
-		rw.Write([]byte("Not found"))
+		rw.Write(b)
 	}))
 	r := httptest.NewRequest(http.MethodGet, "/", nil)
-	r.Header.Set(acceptEncoding, "gzip")
+	r.Header.Set("Accept-Encoding", "gzip")
 	w := httptest.NewRecorder()
 	handler.ServeHTTP(w, r)
 
-	result := w.Result()
-	if result.StatusCode != http.StatusNotFound {
-		t.Errorf("StatusCode should have been 404 but was %d", result.StatusCode)
-	}
+	res := w.Result()
+	assert.Equal(t, http.StatusNotFound, res.StatusCode)
+	assert.Equal(t, "gzip", res.Header.Get("Content-Encoding"))
+	assert.NotEqual(t, b, w.Body.Bytes())
 }
 
+func TestImplementCloseNotifier(t *testing.T) {
+	GzipHandler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request){
+		_, ok := rw.(http.CloseNotifier)
+		assert.True(t, ok, "response writer must implement http.CloseNotifier")
+	})).ServeHTTP(&mockRWCloseNotify{}, &http.Request{})
+}
+
+func TestNotImplementCloseNotifier(t *testing.T) {
+	GzipHandler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request){
+		_, ok := rw.(http.CloseNotifier)
+		assert.False(t, ok, "response writer must not implement http.CloseNotifier")
+	})).ServeHTTP(httptest.NewRecorder(), &http.Request{})
+}
+
+
+type mockRWCloseNotify struct{}
+
+func (m *mockRWCloseNotify) CloseNotify() <-chan bool {
+	panic("implement me")
+}
+
+func (m *mockRWCloseNotify) Header() http.Header {
+	return http.Header{}
+}
+
+func (m *mockRWCloseNotify) Write([]byte) (int, error) {
+	panic("implement me")
+}
+
+func (m *mockRWCloseNotify) WriteHeader(int) {
+	panic("implement me")
+}
+
+
 func TestIgnoreSubsequentWriteHeader(t *testing.T) {
 	handler := GzipHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(500)