Error 500 "Invalid mime type" about openphoto-python HOT 9 CLOSED

def post(self, endpoint, params={}):
    url = urlparse.urlunparse(('http', self.host, endpoint, '', '', ''))

    if self.consumer_key:
        consumer = oauth.Consumer(self.consumer_key, self.consumer_secret)
        token = oauth.Token(self.token, self.token_secret)

        # ensure utf-8 encoding for all values.
        params = dict([(k, v.encode('utf-8')
                        if type(v) is types.UnicodeType else v)
                       for (k, v) in params.items()])

        files = [("photo", 'test.jpg', open('/mnt/ksi2t/scripts/test.jpg', 'rb').read())]

        import mimetools
        import mimetypes

        BOUNDARY = mimetools.choose_boundary()
        CRLF = '\r\n'
        L = []
        for (key, value) in params.items():
            L.append('--' + BOUNDARY)
            L.append('Content-Disposition: form-data; name="%s"' % key)
            L.append('')
            L.append(value)
        for (key, filename, value) in files:
            L.append('--' + BOUNDARY)
            L.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))
            L.append('Content-Type: %s' % mimetypes.guess_type(filename)[0] or 'application/octet-stream')
            L.append('')
            L.append(value)
            L.append('--' + BOUNDARY + '--')
            L.append('')
            body = CRLF.join(L)

        content_type = 'multipart/form-data; boundary=%s' % BOUNDARY

        headers = {'Content-Type': content_type, 'Content-Length': str(len(body))}
        client = oauth.Client(consumer, token)
        headers, content = client.request(url, "POST", body, headers)
        return content