Disable fastcgi_intercept_errors to fix CARDDAV on OSX.

nextcloud/rootfs/nginx/sites-enabled/nginx.conf

@@ -53,7 +53,7 @@ server {
             fastcgi_param modHeadersAvailable true;
             fastcgi_param front_controller_active true;
             fastcgi_pass unix:/php/run/php-fpm.sock;
-            fastcgi_intercept_errors on;
+            fastcgi_intercept_errors off;
             fastcgi_request_buffering off;
             fastcgi_read_timeout 1200;
         }