I battled this one for a little bit and I hope the information here helps someone. First and foremost, there are various version of this problem and they might have different causes stemming from the same source. I list them here in no particular order. I found all the topics starting with a search for the dreaded “Method Not Implemented” 501 error code from the admin panel of WordPress. POST to /test/wp-admin/index-extra.php not supported: This error is also noticed on post.php and theme-editor.php. Now there are various WordPress Forum posts providing somewhat workable solutions to the problem. I tried some of the solutions but either they did not work for me (I had not looked that closely at the error before trying them) or they were too broad and I did not care for the results. There is some finger pointing in both the forums and the various other pages […]
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