diff --git a/web/lib/fetchAllPages.js b/web/lib/fetchAllPages.js
index 624d172c..4e563d83 100644
--- a/web/lib/fetchAllPages.js
+++ b/web/lib/fetchAllPages.js
@@ -6,7 +6,9 @@ export async function fetchAllPages(urlBuilder) {
   while (page < totalPages) {
     const res = await fetch(urlBuilder(page));
     if (!res.ok) {
-      throw new Error(`HTTP ${res.status} – ${res.statusText}`);
+      const body = await res.text().catch(() => '')
+      const detail = body ? `: ${body.slice(0, 200)}` : ''
+      throw new Error(`HTTP ${res.status}${detail}`)
     }
 
     const data = await res.json();