Getting 400 error on creating page & source editor requests

Issue Summary

This is reproducible on Data Center: (yes)

If the page contains one of the following characters sets in the content the saving process gets a HTTP 400 message.

../ 
..\ 
.../ 
...\

Steps to Reproduce

Apart from what's already fixed in CONFSERVER-93655, we have identified a few other requests:

• Create a page and add ../ in the content or title directly, click close button to save a draft
• Add ../ in a page and click <> to open source editor, source editor shows an error when attempting to get storage format.

Expected Results

The saving process should be completed properly.

Actual Results

Getting HTTP 400 message in page or console.

Workaround

There is no proper workaround without modifying customer's data.