I am currently running the latest master branch of MediaWiki and is trying to set up VisualEditor for development. However, since Parsoid switch to PHP starting 1.35, a lot of the current instructions become outdated as they are focusing on the Parsoid/JS. I tried the following Parsoid/PHP#Developer_Setup, which results in VisualEditor displaying error HTTP 500 of not being able to connect to Restbase. When visiting the rest.php page, it displays a 404 error, which can be a result of requiring header added by Gerrit patch 552088.
I am confused as T248343 suggests that VE should be working out of the box, meaning no need to set up the RestBase server. Even I want to set up a RestBase server, the current instructor requires me to know the Parsoid/PHP’s server address, which I do not know since Parsoid/PHP becomes an MW instance. As T248319 indicates, there is currently no instruction on how to setup RestBase with Parsoid/PHP.