I want to get Wikipedia pages as text.

I looked at the Wikipedia API from here https://en.wikipedia.org/w/api.php which says that in order to get pages as text I need to append this to a page address:

api.php?action=query&meta=siteinfo&siprop=namespaces&format=txt

However, when I try appending this suffix to a normal page's address, the page is not found:

https://en.wikipedia.org/wiki/George_Washington/api.php?action=query&meta=siteinfo&siprop=namespaces&format=txt

Following the instructions from Get Text Content from mediawiki page via API, I tried adding /api.php?action=parse&page=test to the end of the query string. Therefore, I obtained this:

https://en.wikipedia.org/wiki/George_Washington/api.php?action=parse&page=test

However, this doesn't work either.