[CONFSERVER-94090] Preview a page that contains special combination of characters fail

This is reproducible on Data Center: (yes)

On Confluence page add text that contains the following combination of text
```
../
```

The page is previewed successfully.

Preview fails and the following error notification is seen:

Can't reach the server. Check you're connected to the internet and Confluence is up and running.

Remove the ../ text combination

Tested with 7.19.16 and the issue was not seen at this version.

duplicates

CONFSERVER-93655 Getting HTTP 400 while saving page by using the close button.

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Confluence Data Center