src/Riak/Api/Http.php
protected function prepareRequestMethod()
    {
        switch ($this->command->getMethod()) {
            case "POST":
                $this->options[CURLOPT_POST] = 1;
                break;
            case "PUT":
                $this->options[CURLOPT_CUSTOMREQUEST] = 'PUT';
                break;
            case "DELETE":
                $this->options[CURLOPT_CUSTOMREQUEST] = 'DELETE';
                break;
            case "HEAD":
                $this->options[CURLOPT_NOBODY] = 1;
                break;
            default:
                // reset http method to get in case its changed
                $this->options[CURLOPT_HTTPGET] = 1;
        }

        return $this;
    }
protected function prepareRequestMethod()
    {
        switch ($this->command->getMethod()) {
            case "POST":
                $this->options[CURLOPT_POST] = 1;
                break;
            case "PUT":
                $this->options[CURLOPT_CUSTOMREQUEST] = 'PUT';
                break;
            case "DELETE":
                $this->options[CURLOPT_CUSTOMREQUEST] = 'DELETE';
                break;
            case "HEAD":
                $this->options[CURLOPT_NOBODY] = 1;
                break;
            default:
                // reset http method to get in case its changed
                $this->options[CURLOPT_HTTPGET] = 1;
        }

        return $this;
    }
Prepare the request method

@return $this