XWiki Maximum Size of pages

Hello
I have a problem with the amount of characters you can put into a page in xWiki. I copy a table with format out of Microsoft Word an put it into the WYSIWYG Editor. That works for a couple of thousand characters. But when there are a few more, xWiki returns with an 'Bad Gateway 502' error.
Is there an options in xWiki where you can set the max. Size of the page or the max. amount of characters.

Thanks a lot.

Kind regards
Alessandro