Umm, you can't edit with the API via GET whatsoever (regardless of what extensions you have installed), you need to POST. (I assume this is because GET actions are not supposed to have side-affects)

Sorry, I've made a mistake in the bug report. Of course I am using POST request, but the data are sent with Content-Type: application/x-www-form-urlencoded:

POST /w/api.php
Content-Length: 2248
Accept-Encoding: gzip
User-Agent: PythonWikipediaBot/1.0
Host: www....
Cookie: <somecookies>
Content-Type: application/x-www-form-urlencoded

The AnitBot plugin just requires anything POST'ed to be done with:

Content-Type: multipart/form-data

as specified on the MediaWiki HTML forms.

(In reply to comment #2)

The AnitBot plugin just requires anything POST'ed to be done with:

Content-Type: multipart/form-data

as specified on the MediaWiki HTML forms.

That's a stupid limitation in Antibot that should be removed then.

It's just a sample plugin, designed to show how to write them, it's not the real thing. It's obvious that it will have false positives and it says so in the file header. There are two real plugins, which target specific bugs in XRumer. Neither of them are public due to the fear that the XRumer people may google for themselves and fix the bugs.