OSS\Http\RequestCore::prep_request PHP Method

    public function prep_request()
    {
        $curl_handle = curl_init();
        // Set default options.
        curl_setopt($curl_handle, CURLOPT_URL, $this->request_url);
        curl_setopt($curl_handle, CURLOPT_FILETIME, true);
        curl_setopt($curl_handle, CURLOPT_FRESH_CONNECT, false);
        //		curl_setopt($curl_handle, CURLOPT_CLOSEPOLICY, CURLCLOSEPOLICY_LEAST_RECENTLY_USED);
        curl_setopt($curl_handle, CURLOPT_MAXREDIRS, 5);
        curl_setopt($curl_handle, CURLOPT_HEADER, true);
        curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl_handle, CURLOPT_TIMEOUT, $this->timeout);
        curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT, $this->connect_timeout);
        curl_setopt($curl_handle, CURLOPT_NOSIGNAL, true);
        curl_setopt($curl_handle, CURLOPT_REFERER, $this->request_url);
        curl_setopt($curl_handle, CURLOPT_USERAGENT, $this->useragent);
        curl_setopt($curl_handle, CURLOPT_READFUNCTION, array($this, 'streaming_read_callback'));
        // Verification of the SSL cert
        if ($this->ssl_verification) {
            curl_setopt($curl_handle, CURLOPT_SSL_VERIFYPEER, true);
            curl_setopt($curl_handle, CURLOPT_SSL_VERIFYHOST, 2);
        } else {
            curl_setopt($curl_handle, CURLOPT_SSL_VERIFYPEER, false);
            curl_setopt($curl_handle, CURLOPT_SSL_VERIFYHOST, false);
        }
        // chmod the file as 0755
        if ($this->cacert_location === true) {
            curl_setopt($curl_handle, CURLOPT_CAINFO, dirname(__FILE__) . '/cacert.pem');
        } elseif (is_string($this->cacert_location)) {
            curl_setopt($curl_handle, CURLOPT_CAINFO, $this->cacert_location);
        }
        // Debug mode
        if ($this->debug_mode) {
            curl_setopt($curl_handle, CURLOPT_VERBOSE, true);
        }
        // Handle open_basedir & safe mode
        if (!ini_get('safe_mode') && !ini_get('open_basedir')) {
            curl_setopt($curl_handle, CURLOPT_FOLLOWLOCATION, true);
        }
        // Enable a proxy connection if requested.
        if ($this->proxy) {
            curl_setopt($curl_handle, CURLOPT_HTTPPROXYTUNNEL, true);
            $host = $this->proxy['host'];
            $host .= $this->proxy['port'] ? ':' . $this->proxy['port'] : '';
            curl_setopt($curl_handle, CURLOPT_PROXY, $host);
            if (isset($this->proxy['user']) && isset($this->proxy['pass'])) {
                curl_setopt($curl_handle, CURLOPT_PROXYUSERPWD, $this->proxy['user'] . ':' . $this->proxy['pass']);
            }
        }
        // Set credentials for HTTP Basic/Digest Authentication.
        if ($this->username && $this->password) {
            curl_setopt($curl_handle, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
            curl_setopt($curl_handle, CURLOPT_USERPWD, $this->username . ':' . $this->password);
        }
        // Handle the encoding if we can.
        if (extension_loaded('zlib')) {
            curl_setopt($curl_handle, CURLOPT_ENCODING, '');
        }
        // Process custom headers
        if (isset($this->request_headers) && count($this->request_headers)) {
            $temp_headers = array();
            foreach ($this->request_headers as $k => $v) {
                $temp_headers[] = $k . ': ' . $v;
            }
            curl_setopt($curl_handle, CURLOPT_HTTPHEADER, $temp_headers);
        }
        switch ($this->method) {
            case self::HTTP_PUT:
                //unset($this->read_stream);
                curl_setopt($curl_handle, CURLOPT_CUSTOMREQUEST, 'PUT');
                if (isset($this->read_stream)) {
                    if (!isset($this->read_stream_size) || $this->read_stream_size < 0) {
                        throw new RequestCore_Exception('The stream size for the streaming upload cannot be determined.');
                    }
                    curl_setopt($curl_handle, CURLOPT_INFILESIZE, $this->read_stream_size);
                    curl_setopt($curl_handle, CURLOPT_UPLOAD, true);
                } else {
                    curl_setopt($curl_handle, CURLOPT_POSTFIELDS, $this->request_body);
                }
                break;
            case self::HTTP_POST:
                curl_setopt($curl_handle, CURLOPT_CUSTOMREQUEST, 'POST');
                if (isset($this->read_stream)) {
                    if (!isset($this->read_stream_size) || $this->read_stream_size < 0) {
                        throw new RequestCore_Exception('The stream size for the streaming upload cannot be determined.');
                    }
                    curl_setopt($curl_handle, CURLOPT_INFILESIZE, $this->read_stream_size);
                    curl_setopt($curl_handle, CURLOPT_UPLOAD, true);
                } else {
                    curl_setopt($curl_handle, CURLOPT_POSTFIELDS, $this->request_body);
                }
                break;
            case self::HTTP_HEAD:
                curl_setopt($curl_handle, CURLOPT_CUSTOMREQUEST, self::HTTP_HEAD);
                curl_setopt($curl_handle, CURLOPT_NOBODY, 1);
                break;
            default:
                // Assumed GET
                curl_setopt($curl_handle, CURLOPT_CUSTOMREQUEST, $this->method);
                if (isset($this->write_stream)) {
                    curl_setopt($curl_handle, CURLOPT_WRITEFUNCTION, array($this, 'streaming_write_callback'));
                    curl_setopt($curl_handle, CURLOPT_HEADER, false);
                } else {
                    curl_setopt($curl_handle, CURLOPT_POSTFIELDS, $this->request_body);
                }
                break;
        }
        // Merge in the CURLOPTs
        if (isset($this->curlopts) && sizeof($this->curlopts) > 0) {
            foreach ($this->curlopts as $k => $v) {
                curl_setopt($curl_handle, $k, $v);
            }
        }
        return $curl_handle;
    }