Getting HTTP 400 while saving a question in Confluence

Issue Summary

This is reproducible on Data Center: (yes)

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

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

Steps to Reproduce

1. Create a fresh instance with Confluence 7.19.19
2. Install Questions for Confluence plugin
3. Go to Questions-Ask questions
4. Add ../  or  ..\ or ...\ or .../ to the questions  heading or in description and save it
5. Gets HTTP 400

Expected Results

The saving process should be completed properly.

Actual Results

Getting HTTP 400 message after clicking the close button.

Workaround

1.  Replace the below characters with ./ and .\ while asking a question 

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

Click save

Please apply the changes on the test or staging environment first to prevent any data loss.