Revert "deprecate embedded browser (#12163)"

This reverts commit 736d8cbac4.

Bring contrib files for older contributions

cmd/generic-handlers_test.go

@@ -113,6 +113,34 @@ func TestGuessIsRPC(t *testing.T) {
 	}
 }
 
+// Tests browser request guess function.
+func TestGuessIsBrowser(t *testing.T) {
+	globalBrowserEnabled = true
+	if guessIsBrowserReq(nil) {
+		t.Fatal("Unexpected return for nil request")
+	}
+	r := &http.Request{
+		Header: http.Header{},
+		URL:    &url.URL{},
+	}
+	r.Header.Set("User-Agent", "Mozilla")
+	if !guessIsBrowserReq(r) {
+		t.Fatal("Test shouldn't fail for a possible browser request anonymous user")
+	}
+	r.Header.Set("Authorization", "Bearer token")
+	if !guessIsBrowserReq(r) {
+		t.Fatal("Test shouldn't fail for a possible browser request JWT user")
+	}
+	r = &http.Request{
+		Header: http.Header{},
+		URL:    &url.URL{},
+	}
+	r.Header.Set("User-Agent", "mc")
+	if guessIsBrowserReq(r) {
+		t.Fatal("Test shouldn't report as browser for a non browser request.")
+	}
+}
+
 var isHTTPHeaderSizeTooLargeTests = []struct {
 	header     http.Header
 	shouldFail bool