def request (self, path, type = 'public', method = 'GET', params = {}, headers = None, body = None):
        request = '/' + self.implode_params (path, params)
        url = self.urls['api'] + request
        query = self.omit (params, self.extract_params (path))
        if type == 'public':
            if query:
                url += '?' + _urlencode.urlencode (query)
        else:
            nonce = str (self.nonce ())
            if query:
                body = self.json (query)
            what = nonce + method + request + (body or '')
            secret = base64.b64decode (self.secret)
            signature = self.hash (what, secret, hashlib.sha256, 'binary')
            headers = {
                'CB-ACCESS-KEY': self.apiKey,
                'CB-ACCESS-SIGN': base64.b64encode (signature),
                'CB-ACCESS-TIMESTAMP': nonce,
                'CB-ACCESS-PASSPHRASE': self.password,
            }
        return self.fetch (url, method, headers, body)