When Portal Proxy Path Is Set Thumbnails From Fragments Are Not Found

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.2.X, Master
• Fix Version/s: 7.2.10 DXP FP5, 7.2.10.2 DXP SP2, 7.2.X, 7.3.0 CE GA1, 7.3.1 CE GA2, 7.3.2 CE GA3, Master
• Component/s: Fragment Administration
• Labels:
  • liferay-dxp-72-sp2
  • liferay-fixpack-dxp-5-7210
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/83693

Steps to reproduce:

1. Before starting the server, include the following property in the file portal-ext.properties:

   portal.proxy.path=/public
   

2. Configure and run a reverse proxy to point to your Liferay instance. If you choose to use NGINX, make sure to use the following configuration:

   worker_processes  1;
   
   events {
       worker_connections  1024;
   }
   
   http {
       server {
           listen 80;
   
           root /usr/local/var/www;
           index index.html index.htm;
           server_name localhost;
   
           location /public/ {
               proxy_set_header Host $host;
               proxy_pass http://localhost:8080/;
           }
       }
   }
   

   What this will do is create a webserver that listens to the port 80, and redirects every request made for its address that has the subpath "/public" to your Liferay's address and port. In the case above, the Liferay instance is located on the same address as the NGINX server and listens to the port 8080;

3. After starting the Liferay instance, access it by going to the URL http://localhost/public if you're using the same machine where the NGINX is running;
4. Login as administrator and go to the Site's Site Builder > Pages;
5. Click to add a Public Page;
6. Select Blank;
7. Give a name to it and add it;
8. On the sidebar, click on Fragments, then Basic Components.

Actual result:
No thumbnail was found.

Expected result:
Liferay should be able to fully load the respective thumbnails.