--- a/src/server/util/io.c	Sat Feb 21 13:12:39 2026 +0100
+++ b/src/server/util/io.c	Sat Feb 21 14:40:03 2026 +0100
@@ -730,7 +730,10 @@
         size_t chunk_available = st->max_read - st->read;
         if(chunk_available > 0) {
             ssize_t r = http_read_buffered(st, rbuf, rbuflen, TRUE, &perform_io);
-            if(r == 0) {
+            if(r <= 0) {
+                if(rd == 0) {
+                    rd = r;
+                }
                 break;
             }
             rd += r;