Why does python keep reverting to application/x-www-form-urlencoded

[DarkByte]

I am trying to send a json encoded post url so I have simplified my code for easy viewing..



def post_json(self, url, data, referer = '', readable = True):
if referer == '':
referer = self.lastpage
self.opener.addheaders = [('Content-Type', 'application/json')]


encodeddata = json.dumps(data)


res = self.opener.open(url, (encodeddata ))



self.lastpage = res.geturl()
if readable:
return self.readable(res)
else:
return res




However when I make the request , I just get this:

[Only registered and activated users can see links]


Anyone know why this is? I have been awake for 30 hours so im hoping its something simple lol.

Here is the full request without everything stripped out:
[Only registered and activated users can see links]