I use shared hosting and have the following problem with Visual Editor on clean wiki 1.35.
Visual editor works fine on usual pages like https://example.org/w/index.php?title=Test. But if I try to edit the subpage https://example.org/w/index.php?title=Test/Test, I get the error: Error contacting the Parsoid/RESTBase server (HTTP 404). The problem exactly in subpages - no matter which namespace is it, if it is a subpage like "Main_Page/subpage", visual editor always doesn't work, but the standard editor works.