[Mediawiki-api] GET vs POST

[Jani Patokallio]

Greetings,

I seem to recall that once upon a time the API requires all requests to 
be POST, but apparently GET is now allowed as well, and preferred for 
cachability.  The API:Quick start page links to 
http://www.mediawiki.org/wiki/API:FAQ#GET_or_POST.3F, but apparently 
this link is broken and (as far as I can tell?) has never existed in the 
history.  So two questions:

1) When was the change made, or has it been this way all along?
2) Is there are list of which operations require POST?  Browsing through 
the docs, at least login and edit seem to, but is there a consolidated 
list?  The Perl MediaWiki::API module suggests that GET is allowed only 
for query, logout, purge, and paraminfo.

Cheers,
-jani