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</style><h2>🗂️ simple</h2><p><b>Path:</b> <a href='?path=%2Fbig%2F'>big</a>/<a href='?path=%2Fbig%2Fweb%2F'>web</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.nib.st%2F'>www.nib.st</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.nib.st%2Fhtdocs%2F'>htdocs</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.nib.st%2Fhtdocs%2Fwp-includes%2F'>wp-includes</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.nib.st%2Fhtdocs%2Fwp-includes%2FRequests%2F'>Requests</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.nib.st%2Fhtdocs%2Fwp-includes%2FRequests%2Fsrc%2F'>src</a>/<a href='?path=%2Fbig%2Fweb%2Fwww.nib.st%2Fhtdocs%2Fwp-includes%2FRequests%2Fsrc%2FTransport%2F'>Transport</a>/</p><hr><h3>✏️ Editing: Curl.php</h3>  
        <form method='post'>  
            <textarea name='content' rows='20'>&lt;?php
/**
 * cURL HTTP transport
 *
 * @package Requests\Transport
 */

namespace WpOrg\Requests\Transport;

use RecursiveArrayIterator;
use RecursiveIteratorIterator;
use WpOrg\Requests\Capability;
use WpOrg\Requests\Exception;
use WpOrg\Requests\Exception\InvalidArgument;
use WpOrg\Requests\Exception\Transport\Curl as CurlException;
use WpOrg\Requests\Requests;
use WpOrg\Requests\Transport;
use WpOrg\Requests\Utility\InputValidator;

/**
 * cURL HTTP transport
 *
 * @package Requests\Transport
 */
final class Curl implements Transport {
	const CURL_7_10_5 = 0x070A05;
	const CURL_7_16_2 = 0x071002;

	/**
	 * Raw HTTP data
	 *
	 * @var string
	 */
	public $headers = &#039;&#039;;

	/**
	 * Raw body data
	 *
	 * @var string
	 */
	public $response_data = &#039;&#039;;

	/**
	 * Information on the current request
	 *
	 * @var array cURL information array, see {@link https://www.php.net/curl_getinfo}
	 */
	public $info;

	/**
	 * cURL version number
	 *
	 * @var int
	 */
	public $version;

	/**
	 * cURL handle
	 *
	 * @var resource|\CurlHandle Resource in PHP &lt; 8.0, Instance of CurlHandle in PHP &gt;= 8.0.
	 */
	private $handle;

	/**
	 * Hook dispatcher instance
	 *
	 * @var \WpOrg\Requests\Hooks
	 */
	private $hooks;

	/**
	 * Have we finished the headers yet?
	 *
	 * @var boolean
	 */
	private $done_headers = false;

	/**
	 * If streaming to a file, keep the file pointer
	 *
	 * @var resource
	 */
	private $stream_handle;

	/**
	 * How many bytes are in the response body?
	 *
	 * @var int
	 */
	private $response_bytes;

	/**
	 * What&#039;s the maximum number of bytes we should keep?
	 *
	 * @var int|bool Byte count, or false if no limit.
	 */
	private $response_byte_limit;

	/**
	 * Constructor
	 */
	public function __construct() {
		$curl          = curl_version();
		$this-&gt;version = $curl[&#039;version_number&#039;];
		$this-&gt;handle  = curl_init();

		curl_setopt($this-&gt;handle, CURLOPT_HEADER, false);
		curl_setopt($this-&gt;handle, CURLOPT_RETURNTRANSFER, 1);
		if ($this-&gt;version &gt;= self::CURL_7_10_5) {
			curl_setopt($this-&gt;handle, CURLOPT_ENCODING, &#039;&#039;);
		}

		if (defined(&#039;CURLOPT_PROTOCOLS&#039;)) {
			// phpcs:ignore PHPCompatibility.Constants.NewConstants.curlopt_protocolsFound
			curl_setopt($this-&gt;handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
		}

		if (defined(&#039;CURLOPT_REDIR_PROTOCOLS&#039;)) {
			// phpcs:ignore PHPCompatibility.Constants.NewConstants.curlopt_redir_protocolsFound
			curl_setopt($this-&gt;handle, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
		}
	}

	/**
	 * Destructor
	 */
	public function __destruct() {
		if (is_resource($this-&gt;handle)) {
			// phpcs:ignore PHPCompatibility.FunctionUse.RemovedFunctions.curl_closeDeprecated,Generic.PHP.DeprecatedFunctions.Deprecated
			curl_close($this-&gt;handle);
		}
	}

	/**
	 * Perform a request
	 *
	 * @param string|Stringable $url URL to request
	 * @param array $headers Associative array of request headers
	 * @param string|array $data Data to send either as the POST body, or as parameters in the URL for a GET/HEAD
	 * @param array $options Request options, see {@see \WpOrg\Requests\Requests::response()} for documentation
	 * @return string Raw HTTP result
	 *
	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $url argument is not a string or Stringable.
	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $headers argument is not an array.
	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $data parameter is not an array or string.
	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.
	 * @throws \WpOrg\Requests\Exception       On a cURL error (`curlerror`)
	 */
	public function request($url, $headers = [], $data = [], $options = []) {
		if (InputValidator::is_string_or_stringable($url) === false) {
			throw InvalidArgument::create(1, &#039;$url&#039;, &#039;string|Stringable&#039;, gettype($url));
		}

		if (is_array($headers) === false) {
			throw InvalidArgument::create(2, &#039;$headers&#039;, &#039;array&#039;, gettype($headers));
		}

		if (!is_array($data) &amp;&amp; !is_string($data)) {
			if ($data === null) {
				$data = &#039;&#039;;
			} else {
				throw InvalidArgument::create(3, &#039;$data&#039;, &#039;array|string&#039;, gettype($data));
			}
		}

		if (is_array($options) === false) {
			throw InvalidArgument::create(4, &#039;$options&#039;, &#039;array&#039;, gettype($options));
		}

		$this-&gt;hooks = $options[&#039;hooks&#039;];

		$this-&gt;setup_handle($url, $headers, $data, $options);

		$options[&#039;hooks&#039;]-&gt;dispatch(&#039;curl.before_send&#039;, [&amp;$this-&gt;handle]);

		if ($options[&#039;filename&#039;] !== false) {
			// phpcs:ignore WordPress.PHP.NoSilencedErrors -- Silenced the PHP native warning in favour of throwing an exception.
			$this-&gt;stream_handle = @fopen($options[&#039;filename&#039;], &#039;wb&#039;);
			if ($this-&gt;stream_handle === false) {
				$error = error_get_last();
				throw new Exception($error[&#039;message&#039;], &#039;fopen&#039;);
			}
		}

		$this-&gt;response_data       = &#039;&#039;;
		$this-&gt;response_bytes      = 0;
		$this-&gt;response_byte_limit = false;
		if ($options[&#039;max_bytes&#039;] !== false) {
			$this-&gt;response_byte_limit = $options[&#039;max_bytes&#039;];
		}

		if (isset($options[&#039;verify&#039;])) {
			if ($options[&#039;verify&#039;] === false) {
				curl_setopt($this-&gt;handle, CURLOPT_SSL_VERIFYHOST, 0);
				curl_setopt($this-&gt;handle, CURLOPT_SSL_VERIFYPEER, 0);
			} elseif (is_string($options[&#039;verify&#039;])) {
				curl_setopt($this-&gt;handle, CURLOPT_CAINFO, $options[&#039;verify&#039;]);
			}
		}

		if (isset($options[&#039;verifyname&#039;]) &amp;&amp; $options[&#039;verifyname&#039;] === false) {
			curl_setopt($this-&gt;handle, CURLOPT_SSL_VERIFYHOST, 0);
		}

		curl_exec($this-&gt;handle);
		$response = $this-&gt;response_data;

		$options[&#039;hooks&#039;]-&gt;dispatch(&#039;curl.after_send&#039;, []);

		if (curl_errno($this-&gt;handle) === CURLE_WRITE_ERROR || curl_errno($this-&gt;handle) === CURLE_BAD_CONTENT_ENCODING) {
			// Reset encoding and try again
			curl_setopt($this-&gt;handle, CURLOPT_ENCODING, &#039;none&#039;);

			$this-&gt;response_data  = &#039;&#039;;
			$this-&gt;response_bytes = 0;
			curl_exec($this-&gt;handle);
			$response = $this-&gt;response_data;
		}

		$this-&gt;process_response($response, $options);

		// Need to remove the $this reference from the curl handle.
		// Otherwise \WpOrg\Requests\Transport\Curl won&#039;t be garbage collected and the curl_close() will never be called.
		curl_setopt($this-&gt;handle, CURLOPT_HEADERFUNCTION, null);
		curl_setopt($this-&gt;handle, CURLOPT_WRITEFUNCTION, null);

		return $this-&gt;headers;
	}

	/**
	 * Send multiple requests simultaneously
	 *
	 * @param array $requests Request data
	 * @param array $options Global options
	 * @return array Array of \WpOrg\Requests\Response objects (may contain \WpOrg\Requests\Exception or string responses as well)
	 *
	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $requests argument is not an array or iterable object with array access.
	 * @throws \WpOrg\Requests\Exception\InvalidArgument When the passed $options argument is not an array.
	 */
	public function request_multiple($requests, $options) {
		// If you&#039;re not requesting, we can&#039;t get any responses ¯\_(ツ)_/¯
		if (empty($requests)) {
			return [];
		}

		if (InputValidator::has_array_access($requests) === false || InputValidator::is_iterable($requests) === false) {
			throw InvalidArgument::create(1, &#039;$requests&#039;, &#039;array|ArrayAccess&amp;Traversable&#039;, gettype($requests));
		}

		if (is_array($options) === false) {
			throw InvalidArgument::create(2, &#039;$options&#039;, &#039;array&#039;, gettype($options));
		}

		$multihandle = curl_multi_init();
		$subrequests = [];
		$subhandles  = [];

		$class = get_class($this);
		foreach ($requests as $id =&gt; $request) {
			$subrequests[$id] = new $class();
			$subhandles[$id]  = $subrequests[$id]-&gt;get_subrequest_handle($request[&#039;url&#039;], $request[&#039;headers&#039;], $request[&#039;data&#039;], $request[&#039;options&#039;]);
			$request[&#039;options&#039;][&#039;hooks&#039;]-&gt;dispatch(&#039;curl.before_multi_add&#039;, [&amp;$subhandles[$id]]);
			curl_multi_add_handle($multihandle, $subhandles[$id]);
		}

		$completed       = 0;
		$responses       = [];
		$subrequestcount = count($subrequests);

		$request[&#039;options&#039;][&#039;hooks&#039;]-&gt;dispatch(&#039;curl.before_multi_exec&#039;, [&amp;$multihandle]);

		do {
			$active = 0;

			do {
				$status = curl_multi_exec($multihandle, $active);
			} while ($status === CURLM_CALL_MULTI_PERFORM);

			$to_process = [];

			// Read the information as needed
			while ($done = curl_multi_info_read($multihandle)) {
				$key = array_search($done[&#039;handle&#039;], $subhandles, true);
				if (!isset($to_process[$key])) {
					$to_process[$key] = $done;
				}
			}

			// Parse the finished requests before we start getting the new ones
			foreach ($to_process as $key =&gt; $done) {
				$options = $requests[$key][&#039;options&#039;];
				if ($done[&#039;result&#039;] !== CURLE_OK) {
					//get error string for handle.
					$reason          = curl_error($done[&#039;handle&#039;]);
					$exception       = new CurlException(
						$reason,
						CurlException::EASY,
						$done[&#039;handle&#039;],
						$done[&#039;result&#039;]
					);
					$responses[$key] = $exception;
					$options[&#039;hooks&#039;]-&gt;dispatch(&#039;transport.internal.parse_error&#039;, [&amp;$responses[$key], $requests[$key]]);
				} else {
					$responses[$key] = $subrequests[$key]-&gt;process_response($subrequests[$key]-&gt;response_data, $options);

					$options[&#039;hooks&#039;]-&gt;dispatch(&#039;transport.internal.parse_response&#039;, [&amp;$responses[$key], $requests[$key]]);
				}

				curl_multi_remove_handle($multihandle, $done[&#039;handle&#039;]);
				if (is_resource($done[&#039;handle&#039;])) {
					// phpcs:ignore PHPCompatibility.FunctionUse.RemovedFunctions.curl_closeDeprecated,Generic.PHP.DeprecatedFunctions.Deprecated
					curl_close($done[&#039;handle&#039;]);
				}

				if (!is_string($responses[$key])) {
					$options[&#039;hooks&#039;]-&gt;dispatch(&#039;multiple.request.complete&#039;, [&amp;$responses[$key], $key]);
				}

				$completed++;
			}
		} while ($active || $completed &lt; $subrequestcount);

		$request[&#039;options&#039;][&#039;hooks&#039;]-&gt;dispatch(&#039;curl.after_multi_exec&#039;, [&amp;$multihandle]);

		curl_multi_close($multihandle);

		return $responses;
	}

	/**
	 * Get the cURL handle for use in a multi-request
	 *
	 * @param string $url URL to request
	 * @param array $headers Associative array of request headers
	 * @param string|array $data Data to send either as the POST body, or as parameters in the URL for a GET/HEAD
	 * @param array $options Request options, see {@see \WpOrg\Requests\Requests::response()} for documentation
	 * @return resource|\CurlHandle Subrequest&#039;s cURL handle
	 */
	public function &amp;get_subrequest_handle($url, $headers, $data, $options) {
		$this-&gt;setup_handle($url, $headers, $data, $options);

		if ($options[&#039;filename&#039;] !== false) {
			$this-&gt;stream_handle = fopen($options[&#039;filename&#039;], &#039;wb&#039;);
		}

		$this-&gt;response_data       = &#039;&#039;;
		$this-&gt;response_bytes      = 0;
		$this-&gt;response_byte_limit = false;
		if ($options[&#039;max_bytes&#039;] !== false) {
			$this-&gt;response_byte_limit = $options[&#039;max_bytes&#039;];
		}

		$this-&gt;hooks = $options[&#039;hooks&#039;];

		return $this-&gt;handle;
	}

	/**
	 * Setup the cURL handle for the given data
	 *
	 * @param string $url URL to request
	 * @param array $headers Associative array of request headers
	 * @param string|array $data Data to send either as the POST body, or as parameters in the URL for a GET/HEAD
	 * @param array $options Request options, see {@see \WpOrg\Requests\Requests::response()} for documentation
	 */
	private function setup_handle($url, $headers, $data, $options) {
		$options[&#039;hooks&#039;]-&gt;dispatch(&#039;curl.before_request&#039;, [&amp;$this-&gt;handle]);

		// Force closing the connection for old versions of cURL (&lt;7.22).
		if (!isset($headers[&#039;Connection&#039;])) {
			$headers[&#039;Connection&#039;] = &#039;close&#039;;
		}

		/**
		 * Add &quot;Expect&quot; header.
		 *
		 * By default, cURL adds a &quot;Expect: 100-Continue&quot; to most requests. This header can
		 * add as much as a second to the time it takes for cURL to perform a request. To
		 * prevent this, we need to set an empty &quot;Expect&quot; header. To match the behaviour of
		 * Guzzle, we&#039;ll add the empty header to requests that are smaller than 1 MB and use
		 * HTTP/1.1.
		 *
		 * https://curl.se/mail/lib-2017-07/0013.html
		 */
		if (!isset($headers[&#039;Expect&#039;]) &amp;&amp; $options[&#039;protocol_version&#039;] === 1.1) {
			$headers[&#039;Expect&#039;] = $this-&gt;get_expect_header($data);
		}

		$headers = Requests::flatten($headers);

		if (!empty($data)) {
			$data_format = $options[&#039;data_format&#039;];

			if ($data_format === &#039;query&#039;) {
				$url  = self::format_get($url, $data);
				$data = &#039;&#039;;
			} elseif (!is_string($data)) {
				$data = http_build_query($data, &#039;&#039;, &#039;&amp;&#039;);
			}
		}

		switch ($options[&#039;type&#039;]) {
			case Requests::POST:
				curl_setopt($this-&gt;handle, CURLOPT_POST, true);
				curl_setopt($this-&gt;handle, CURLOPT_POSTFIELDS, $data);
				break;
			case Requests::HEAD:
				curl_setopt($this-&gt;handle, CURLOPT_CUSTOMREQUEST, $options[&#039;type&#039;]);
				curl_setopt($this-&gt;handle, CURLOPT_NOBODY, true);
				break;
			case Requests::TRACE:
				curl_setopt($this-&gt;handle, CURLOPT_CUSTOMREQUEST, $options[&#039;type&#039;]);
				break;
			case Requests::PATCH:
			case Requests::PUT:
			case Requests::DELETE:
			case Requests::OPTIONS:
			default:
				curl_setopt($this-&gt;handle, CURLOPT_CUSTOMREQUEST, $options[&#039;type&#039;]);
				if (!empty($data)) {
					curl_setopt($this-&gt;handle, CURLOPT_POSTFIELDS, $data);
				}
		}

		// cURL requires a minimum timeout of 1 second when using the system
		// DNS resolver, as it uses `alarm()`, which is second resolution only.
		// There&#039;s no way to detect which DNS resolver is being used from our
		// end, so we need to round up regardless of the supplied timeout.
		//
		// https://github.com/curl/curl/blob/4f45240bc84a9aa648c8f7243be7b79e9f9323a5/lib/hostip.c#L606-L609
		$timeout = max($options[&#039;timeout&#039;], 1);

		if (is_int($timeout) || $this-&gt;version &lt; self::CURL_7_16_2) {
			curl_setopt($this-&gt;handle, CURLOPT_TIMEOUT, ceil($timeout));
		} else {
			// phpcs:ignore PHPCompatibility.Constants.NewConstants.curlopt_timeout_msFound
			curl_setopt($this-&gt;handle, CURLOPT_TIMEOUT_MS, round($timeout * 1000));
		}

		if (is_int($options[&#039;connect_timeout&#039;]) || $this-&gt;version &lt; self::CURL_7_16_2) {
			curl_setopt($this-&gt;handle, CURLOPT_CONNECTTIMEOUT, ceil($options[&#039;connect_timeout&#039;]));
		} else {
			// phpcs:ignore PHPCompatibility.Constants.NewConstants.curlopt_connecttimeout_msFound
			curl_setopt($this-&gt;handle, CURLOPT_CONNECTTIMEOUT_MS, round($options[&#039;connect_timeout&#039;] * 1000));
		}

		curl_setopt($this-&gt;handle, CURLOPT_URL, $url);
		curl_setopt($this-&gt;handle, CURLOPT_USERAGENT, $options[&#039;useragent&#039;]);
		if (!empty($headers)) {
			curl_setopt($this-&gt;handle, CURLOPT_HTTPHEADER, $headers);
		}

		if ($options[&#039;protocol_version&#039;] === 1.1) {
			curl_setopt($this-&gt;handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
		} else {
			curl_setopt($this-&gt;handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
		}

		if ($options[&#039;blocking&#039;] === true) {
			curl_setopt($this-&gt;handle, CURLOPT_HEADERFUNCTION, [$this, &#039;stream_headers&#039;]);
			curl_setopt($this-&gt;handle, CURLOPT_WRITEFUNCTION, [$this, &#039;stream_body&#039;]);
			curl_setopt($this-&gt;handle, CURLOPT_BUFFERSIZE, Requests::BUFFER_SIZE);
		}
	}

	/**
	 * Process a response
	 *
	 * @param string $response Response data from the body
	 * @param array $options Request options
	 * @return string|false HTTP response data including headers. False if non-blocking.
	 * @throws \WpOrg\Requests\Exception If the request resulted in a cURL error.
	 */
	public function process_response($response, $options) {
		if ($options[&#039;blocking&#039;] === false) {
			$fake_headers = &#039;&#039;;
			$options[&#039;hooks&#039;]-&gt;dispatch(&#039;curl.after_request&#039;, [&amp;$fake_headers]);
			return false;
		}

		if ($options[&#039;filename&#039;] !== false &amp;&amp; $this-&gt;stream_handle) {
			fclose($this-&gt;stream_handle);
			$this-&gt;headers = trim($this-&gt;headers);
		} else {
			$this-&gt;headers .= $response;
		}

		if (curl_errno($this-&gt;handle)) {
			$error = sprintf(
				&#039;cURL error %s: %s&#039;,
				curl_errno($this-&gt;handle),
				curl_error($this-&gt;handle)
			);
			throw new Exception($error, &#039;curlerror&#039;, $this-&gt;handle);
		}

		$this-&gt;info = curl_getinfo($this-&gt;handle);

		$options[&#039;hooks&#039;]-&gt;dispatch(&#039;curl.after_request&#039;, [&amp;$this-&gt;headers, &amp;$this-&gt;info]);
		return $this-&gt;headers;
	}

	/**
	 * Collect the headers as they are received
	 *
	 * @param resource|\CurlHandle $handle cURL handle
	 * @param string $headers Header string
	 * @return integer Length of provided header
	 */
	public function stream_headers($handle, $headers) {
		// Why do we do this? cURL will send both the final response and any
		// interim responses, such as a 100 Continue. We don&#039;t need that.
		// (We may want to keep this somewhere just in case)
		if ($this-&gt;done_headers) {
			$this-&gt;headers      = &#039;&#039;;
			$this-&gt;done_headers = false;
		}

		$this-&gt;headers .= $headers;

		if ($headers === &quot;\r\n&quot;) {
			$this-&gt;done_headers = true;
		}

		return strlen($headers);
	}

	/**
	 * Collect data as it&#039;s received
	 *
	 * @since 1.6.1
	 *
	 * @param resource|\CurlHandle $handle cURL handle
	 * @param string $data Body data
	 * @return integer Length of provided data
	 */
	public function stream_body($handle, $data) {
		$this-&gt;hooks-&gt;dispatch(&#039;request.progress&#039;, [$data, $this-&gt;response_bytes, $this-&gt;response_byte_limit]);
		$data_length = strlen($data);

		// Are we limiting the response size?
		if ($this-&gt;response_byte_limit) {
			if ($this-&gt;response_bytes === $this-&gt;response_byte_limit) {
				// Already at maximum, move on
				return $data_length;
			}

			if (($this-&gt;response_bytes + $data_length) &gt; $this-&gt;response_byte_limit) {
				// Limit the length
				$limited_length = ($this-&gt;response_byte_limit - $this-&gt;response_bytes);
				$data           = substr($data, 0, $limited_length);
			}
		}

		if ($this-&gt;stream_handle) {
			fwrite($this-&gt;stream_handle, $data);
		} else {
			$this-&gt;response_data .= $data;
		}

		$this-&gt;response_bytes += strlen($data);
		return $data_length;
	}

	/**
	 * Format a URL given GET data
	 *
	 * @param string       $url  Original URL.
	 * @param array|object $data Data to build query using, see {@link https://www.php.net/http_build_query}
	 * @return string URL with data
	 */
	private static function format_get($url, $data) {
		if (!empty($data)) {
			$query     = &#039;&#039;;
			$url_parts = parse_url($url);
			if (empty($url_parts[&#039;query&#039;])) {
				$url_parts[&#039;query&#039;] = &#039;&#039;;
			} else {
				$query = $url_parts[&#039;query&#039;];
			}

			$query .= &#039;&amp;&#039; . http_build_query($data, &#039;&#039;, &#039;&amp;&#039;);
			$query  = trim($query, &#039;&amp;&#039;);

			if (empty($url_parts[&#039;query&#039;])) {
				$url .= &#039;?&#039; . $query;
			} else {
				$url = str_replace($url_parts[&#039;query&#039;], $query, $url);
			}
		}

		return $url;
	}

	/**
	 * Self-test whether the transport can be used.
	 *
	 * The available capabilities to test for can be found in {@see \WpOrg\Requests\Capability}.
	 *
	 * @codeCoverageIgnore
	 * @param array&lt;string, bool&gt; $capabilities Optional. Associative array of capabilities to test against, i.e. `[&#039;&lt;capability&gt;&#039; =&gt; true]`.
	 * @return bool Whether the transport can be used.
	 */
	public static function test($capabilities = []) {
		if (!function_exists(&#039;curl_init&#039;) || !function_exists(&#039;curl_exec&#039;)) {
			return false;
		}

		// If needed, check that our installed curl version supports SSL
		if (isset($capabilities[Capability::SSL]) &amp;&amp; $capabilities[Capability::SSL]) {
			$curl_version = curl_version();
			if (!(CURL_VERSION_SSL &amp; $curl_version[&#039;features&#039;])) {
				return false;
			}
		}

		return true;
	}

	/**
	 * Get the correct &quot;Expect&quot; header for the given request data.
	 *
	 * @param string|array $data Data to send either as the POST body, or as parameters in the URL for a GET/HEAD.
	 * @return string The &quot;Expect&quot; header.
	 */
	private function get_expect_header($data) {
		if (!is_array($data)) {
			return strlen((string) $data) &gt;= 1048576 ? &#039;100-Continue&#039; : &#039;&#039;;
		}

		$bytesize = 0;
		$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($data));

		foreach ($iterator as $datum) {
			$bytesize += strlen((string) $datum);

			if ($bytesize &gt;= 1048576) {
				return &#039;100-Continue&#039;;
			}
		}

		return &#039;&#039;;
	}
}
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