Another Nextcloud and Collabora Online workaround.

This time it's mixed content.

conf.d/nextcloud.shore.co.il.conf

@@ -27,8 +27,12 @@ server {
         include                 snippets/proxy-headers.conf;
         proxy_hide_header       X-Frame-Options;
         client_max_body_size    512m;
+
         # Temporary measure to test a Collabora Online issue, should not be left
         # as is.
         proxy_hide_header       content-security-policy;
+        # Another workaround, this time mixed content and HSTS.
+        sub_filter_once         on;
+        sub_filter              'http://nextcloud.shore.co.il' 'https://nextcloud.shore.co.il';
     }
 }