1 files changed, 10 insertions, 4 deletions
diff --git a/web_src/js/utils.js b/web_src/js/utils.js
index b9cd69e15a..c7624404c7 100644
--- a/web_src/js/utils.js
+++ b/web_src/js/utils.js
@@ -134,9 +134,15 @@ export function convertImage(blob, mime) {
   });
 }
 
-export function toAbsoluteUrl(relUrl) {
-  if (relUrl.startsWith('http://') || relUrl.startsWith('https://')) {
-    return relUrl;
+export function toAbsoluteUrl(url) {
+  if (url.startsWith('http://') || url.startsWith('https://')) {
+    return url;
   }
-  return `${window.location.origin}${relUrl}`;
+  if (url.startsWith('//')) {
+    return `${window.location.protocol}${url}`; // it's also a somewhat absolute URL (with the current scheme)
+  }
+  if (url && !url.startsWith('/')) {
+    throw new Error('unsupported url, it should either start with / or http(s)://');
+  }
+  return `${window.location.origin}${url}`;
 }