Problem

When inserting a table of contents, it will spin for a long time, and the data will not be displayed. The same behavior below will happen:

Cause

In the httpd.conf from Apache there is a parameter called: ProxyHTMLEnable On

Resolution

In the httpd.conf file, comment out the ProxyHTMLEnable On property:

<VirtualHost *:443>
...
ProxyHTMLEnable On
...
</VirtualHost>