nakarte

commit 3e9e52deb0e24228d8967d86b92a549a36987a66
parent 80969c27af0529172aa0d9245f66ebffe4cceea1
Author: Sergey Orlov <wladimirych@gmail.com>
Date:   Mon,  3 Aug 2020 12:56:36 +0200

add browser hints to speed up first request for elevation, tracks, proxy

Diffstat:
M
src/index.js
 | 
16
++++++++++++++++

1 file changed, 16 insertions(+), 0 deletions(-)
diff --git a/src/index.js b/src/index.js
@@ -20,6 +20,22 @@ function getUid() {
     return uid;
 }
 
+function preconnect(url) {
+    const preconnectLink = document.createElement('link');
+    preconnectLink.rel = 'preconnect';
+    preconnectLink.href = url;
+    document.head.appendChild(preconnectLink);
+
+    const dnsPrefetchLink = document.createElement('link');
+    dnsPrefetchLink.rel = 'dns-prefetch';
+    dnsPrefetchLink.href = url;
+    document.head.appendChild(dnsPrefetchLink);
+}
+
+preconnect(config.elevationsServer);
+preconnect(config.CORSProxyUrl);
+preconnect(config.tracksStorageServer);
+
 if (NODE_ENV === 'production') {
     Sentry.init({
         dsn: config.sentryDSN,