Use SSL
To allow your Rendition to work over https, you have to change some properties in ARender server and Rendition server.
Note that you cannot use both of http and https at the same time.
On ARender server side
Add these lines below in the following file:
arender.server.rendition.hosts=https://RENDITION_HOSTNAME:RENDITION_PORT/
arender.rest.ssl.custom.use=true
On rendition server side
Copy the files located in "YOUR_RENDITION_FOLDER/secure-mode-properties/" in their respective destination in "YOUR_RENDITION_FOLDER/modules/" as it should then place them correctly in their respective folders.