cloud: allow bigger urls for downloads

cloud/nginx.conf

@@ -75,6 +75,9 @@ http {
         client_max_body_size 10G;
         fastcgi_buffers 64 4K;
 
+        # allow longer url, like when we want to download a lot of files
+        large_client_header_buffers 4 64k;
+
         # Enable gzip but do not remove ETag headers
         gzip on;
         gzip_vary on;