Curl.php

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<?php
namespace Magento\Framework\HTTP\Adapter;

class Curl implements \Zend_Http_Client_Adapter_Interface
{
    protected $_config = [
        'protocols' => (CURLPROTO_HTTP
            | CURLPROTO_HTTPS
            | CURLPROTO_FTP
            | CURLPROTO_FTPS
        ),
        'verifypeer' => true,
        'verifyhost' => 2
    ];

    protected $_resource;

    protected $_allowedParams = [
        'timeout'      => CURLOPT_TIMEOUT,
        'maxredirects' => CURLOPT_MAXREDIRS,
        'proxy'        => CURLOPT_PROXY,
        'ssl_cert'     => CURLOPT_SSLCERT,
        'userpwd'      => CURLOPT_USERPWD,
        'useragent'    => CURLOPT_USERAGENT,
        'referer'      => CURLOPT_REFERER,
        'protocols'    => CURLOPT_PROTOCOLS,
        'verifypeer'   => CURLOPT_SSL_VERIFYPEER,
        'verifyhost'   => CURLOPT_SSL_VERIFYHOST,
        'sslversion'   => CURLOPT_SSLVERSION,
    ];

    protected $_options = [];

    protected function _applyConfig()
    {
        // apply additional options to cURL
        foreach ($this->_options as $option => $value) {
            curl_setopt($this->_getResource(), $option, $value);
        }

        // apply config options
        foreach ($this->getDefaultConfig() as $option => $value) {
            curl_setopt($this->_getResource(), $option, $value);
        }

        return $this;
    }

    private function getDefaultConfig()
    {
        $config = [];
        foreach (array_keys($this->_config) as $param) {
            if (array_key_exists($param, $this->_allowedParams)) {
                $config[$this->_allowedParams[$param]] = $this->_config[$param];
            }
        }
        return $config;
    }

    public function setOptions(array $options = [])
    {
        $this->_options = $options;
        return $this;
    }

    public function addOption($option, $value)
    {
        $this->_options[$option] = $value;
        return $this;
    }

    public function setConfig($config = [])
    {
        foreach ($config as $key => $value) {
            $this->_config[$key] = $value;
        }
        return $this;
    }

    public function connect($host, $port = 80, $secure = false)
    {
        return $this->_applyConfig();
    }

    public function write($method, $url, $http_ver = '1.1', $headers = [], $body = '')
    {
        $this->_applyConfig();

        // set url to post to
        curl_setopt($this->_getResource(), CURLOPT_URL, $url);
        curl_setopt($this->_getResource(), CURLOPT_RETURNTRANSFER, true);
        if ($method == \Zend_Http_Client::POST) {
            curl_setopt($this->_getResource(), CURLOPT_POST, true);
            curl_setopt($this->_getResource(), CURLOPT_CUSTOMREQUEST, 'POST');
            curl_setopt($this->_getResource(), CURLOPT_POSTFIELDS, $body);
        } elseif ($method == \Zend_Http_Client::PUT) {
            curl_setopt($this->_getResource(), CURLOPT_CUSTOMREQUEST, 'PUT');
            curl_setopt($this->_getResource(), CURLOPT_POSTFIELDS, $body);
        } elseif ($method == \Zend_Http_Client::GET) {
            curl_setopt($this->_getResource(), CURLOPT_HTTPGET, true);
            curl_setopt($this->_getResource(), CURLOPT_CUSTOMREQUEST, 'GET');
        }

        if (is_array($headers)) {
            curl_setopt($this->_getResource(), CURLOPT_HTTPHEADER, $headers);
        }

        $header = isset($this->_config['header']) ? $this->_config['header'] : true;
        curl_setopt($this->_getResource(), CURLOPT_HEADER, $header);

        return $body;
    }

    public function read()
    {
        $response = curl_exec($this->_getResource());

        // Remove 100 and 101 responses headers
        while (\Zend_Http_Response::extractCode($response) == 100
            || \Zend_Http_Response::extractCode($response) == 101
        ) {
            $response = preg_split('/^\r?$/m', $response, 2);
            $response = trim($response[1]);
        }

        // CUrl will handle chunked data but leave the header.
        $response = preg_replace('/Transfer-Encoding:\s+chunked\r?\n/i', '', $response);

        return $response;
    }

    public function close()
    {
        curl_close($this->_getResource());
        $this->_resource = null;
        return $this;
    }

    protected function _getResource()
    {
        if ($this->_resource === null) {
            $this->_resource = curl_init();
        }
        return $this->_resource;
    }

    public function getErrno()
    {
        return curl_errno($this->_getResource());
    }

    public function getError()
    {
        return curl_error($this->_getResource());
    }

    public function getInfo($opt = 0)
    {
        return curl_getinfo($this->_getResource(), $opt);
    }

    public function multiRequest($urls, $options = [])
    {
        $handles = [];
        $result = [];

        $multihandle = curl_multi_init();

        // add default parameters
        foreach ($this->getDefaultConfig() as $defaultOption => $defaultValue) {
            if (!isset($options[$defaultOption])) {
                $options[$defaultOption] = $defaultValue;
            }
        }

        foreach ($urls as $key => $url) {
            $handles[$key] = curl_init();
            curl_setopt($handles[$key], CURLOPT_URL, $url);
            curl_setopt($handles[$key], CURLOPT_HEADER, 0);
            curl_setopt($handles[$key], CURLOPT_RETURNTRANSFER, 1);
            if (!empty($options)) {
                curl_setopt_array($handles[$key], $options);
            }
            curl_multi_add_handle($multihandle, $handles[$key]);
        }
        $process = null;
        do {
            curl_multi_exec($multihandle, $process);
            usleep(100);
        } while ($process > 0);

        foreach ($handles as $key => $handle) {
            $result[$key] = curl_multi_getcontent($handle);
            curl_multi_remove_handle($multihandle, $handle);
        }
        curl_multi_close($multihandle);
        return $result;
    }
}