Requests_Exception('Only HTTP(S) requests are handled.', 'nonhttp', $url);
		}

		if (empty($options['hooks'])) {
			$options['hooks'] = new Requests_Hooks();
		}

		if (is_array($options['auth'])) {
			$options['auth'] = new Requests_Auth_Basic($options['auth']);
		}
		if ($options['auth'] !== false) {
			$options['auth']->register($options['hooks']);
		}

		if (is_string($options['proxy']) || is_array($options['proxy'])) {
			$options['proxy'] = new Requests_Proxy_HTTP($options['proxy']);
		}
		if ($options['proxy'] !== false) {
			$options['proxy']->register($options['hooks']);
		}

		if (is_array($options['cookies'])) {
			$options['cookies'] = new Requests_Cookie_Jar($options['cookies']);
		}
		elseif (empty($options['cookies'])) {
			$options['cookies'] = new Requests_Cookie_Jar();
		}
		if ($options['cookies'] !== false) {
			$options['cookies']->register($options['hooks']);
		}

		if ($options['idn'] !== false) {
			$iri = new Requests_IRI($url);
			$iri->host = Requests_IDNAEncoder::encode($iri->ihost);
			$url = $iri->uri;
		}

		// Massage the type to ensure we support it.
		$type = strtoupper($type);

		if (!isset($options['data_format'])) {
			if (in_array($type, array(self::HEAD, self::GET, self::DELETE))) {
				$options['data_format'] = 'query';
			}
			else {
				$options['data_format'] = 'body';
			}
		}
	}

	/**
	 * HTTP response parser
	 *
	 * @throws Requests_Exception On missing head/body separator (`requests.no_crlf_separator`)
	 * @throws Requests_Exception On missing head/body separator (`noversion`)
	 * @throws Requests_Exception On missing head/body separator (`toomanyredirects`)
	 *
	 * @param string $headers Full response text including headers and body
	 * @param string $url Original request URL
	 * @param array $req_headers Original $headers array passed to {@link request()}, in case we need to follow redirects
	 * @param array $req_data Original $data array passed to {@link request()}, in case we need to follow redirects
	 * @param array $options Original $options array passed to {@link request()}, in case we need to follow redirects
	 * @return Requests_Response
	 */
	protected static function parse_response($headers, $url, $req_headers, $req_data, $options) {
		$return = new Requests_Response();
		if (!$options['blocking']) {
			return $return;
		}

		$return->raw = $headers;
		$return->url = $url;

		if (!$options['filename']) {
			if (($pos = strpos($headers, "\r\n\r\n")) === false) {
				// Crap!
				throw new Requests_Exception('Missing header/body separator', 'requests.no_crlf_separator');
			}

			$headers = substr($return->raw, 0, $pos);
			$return->body = substr($return->raw, $pos + strlen("\n\r\n\r"));
		}
		else {
			$return->body = '';
		}
		// Pretend CRLF = LF for compatibility (RFC 2616, section 19.3)
		$headers = str_replace("\r\n", "\n", $headers);
		// Unfold headers (replace [CRLF] 1*( SP | HT ) with SP) as per RFC 2616 (section 2.2)
		$headers = preg_replace('/\n[ \t]/', ' ', $headers);
		$headers = explode("\n", $headers);
		preg_match('#^HTTP/(1\.\d)[ \t]+(\d+)#i', array_shift($headers), $matches);
		if (empty($matches)) {
			throw new Requests_Exception('Response could not be parsed', 'noversion', $headers);
		}
		$return->protocol_version = (float) $matches[1];
		$return->status_code = (int) $matches[2];
		if ($return->status_code >= 200 && $return->status_code < 300) {
			$return->success = true;
		}

		foreach ($headers as $header) {
			list($key, $value) = explode(':', $header, 2);
			$value = trim($value);
			preg_replace('#(\s+)#i', ' ', $value);
			$return->headers[$key] = $value;
		}
		if (isset($return->headers['transfer-encoding'])) {
			$return->body = self::decode_chunked($return->body);
			unset($return->headers['transfer-encoding']);
		}
		if (isset($return->headers['content-encoding'])) {
			$return->body = self::decompress($return->body);
		}

		//fsockopen and cURL compatibility
		if (isset($return->headers['connection'])) {
			unset($return->headers['connection']);
		}

		$options['hooks']->dispatch('requests.before_redirect_check', array(&$return, $req_headers, $req_data, $options));

		if ($return->is_redirect() && $options['follow_redirects'] === true) {
			if (isset($return->headers['location']) && $options['redirected'] < $options['redirects']) {
				if ($return->status_code === 303) {
					$options['type'] = self::GET;
				}
				$options['redirected']++;
				$location = $return->headers['location'];
				if (strpos($location, 'http://') !== 0 && strpos($location, 'https://') !== 0) {
					// relative redirect, for compatibility make it absolute
					$location = Requests_IRI::absolutize($url, $location);
					$location = $location->uri;
				}

				$hook_args = array(
					&$location,
					&$req_headers,
					&$req_data,
					&$options,
					$return
				);
				$options['hooks']->dispatch('requests.before_redirect', $hook_args);
				$redirected = self::request($location, $req_headers, $req_data, $options['type'], $options);
				$redirected->history[] = $return;
				return $redirected;
			}
			elseif ($options['redirected'] >= $options['redirects']) {
				throw new Requests_Exception('Too many redirects', 'toomanyredirects', $return);
			}
		}

		$return->redirects = $options['redirected'];

		$options['hooks']->dispatch('requests.after_request', array(&$return, $req_headers, $req_data, $options));
		return $return;
	}

	/**
	 * Callback for `transport.internal.parse_response`
	 *
	 * Internal use only. Converts a raw HTTP response to a Requests_Response
	 * while still executing a multiple request.
	 *
	 * @param string $response Full response text including headers and body (will be overwritten with Response instance)
	 * @param array $request Request data as passed into {@see Requests::request_multiple()}
	 * @return null `$response` is either set to a Requests_Response instance, or a Requests_Exception object
	 */
	public static function parse_multiple(&$response, $request) {
		try {
			$url = $request['url'];
			$headers = $request['headers'];
			$data = $request['data'];
			$options = $request['options'];
			$response = self::parse_response($response, $url, $headers, $data, $options);
		}
		catch (Requests_Exception $e) {
			$response = $e;
		}
	}

	/**
	 * Decoded a chunked body as per RFC 2616
	 *
	 * @see https://tools.ietf.org/html/rfc2616#section-3.6.1
	 * @param string $data Chunked body
	 * @return string Decoded body
	 */
	protected static function decode_chunked($data) {
		if (!preg_match('/^([0-9a-f]+)(?:;(?:[\w-]*)(?:=(?:(?:[\w-]*)*|"(?:[^\r\n])*"))?)*\r\n/i', trim($data))) {
			return $data;
		}



		$decoded = '';
		$encoded = $data;

		while (true) {
			$is_chunked = (bool) preg_match('/^([0-9a-f]+)(?:;(?:[\w-]*)(?:=(?:(?:[\w-]*)*|"(?:[^\r\n])*"))?)*\r\n/i', $encoded, $matches);
			if (!$is_chunked) {
				// Looks like it's not chunked after all
				return $data;
			}

			$length = hexdec(trim($matches[1]));
			if ($length === 0) {
				// Ignore trailer headers
				return $decoded;
			}

			$chunk_length = strlen($matches[0]);
			$decoded .= substr($encoded, $chunk_length, $length);
			$encoded = substr($encoded, $chunk_length + $length + 2);

			if (trim($encoded) === '0' || empty($encoded)) {
				return $decoded;
			}
		}

		// We'll never actually get down here
		// @codeCoverageIgnoreStart
	}
	// @codeCoverageIgnoreEnd

	/**
	 * Convert a key => value array to a 'key: value' array for headers
	 *
	 * @param array $array Dictionary of header values
	 * @return array List of headers
	 */
	public static function flatten($array) {
		$return = array();
		foreach ($array as $key => $value) {
			$return[] = sprintf('%s: %s', $key, $value);
		}
		return $return;
	}

	/**
	 * Convert a key => value array to a 'key: value' array for headers
	 *
	 * @codeCoverageIgnore
	 * @deprecated Misspelling of {@see Requests::flatten}
	 * @param array $array Dictionary of header values
	 * @return array List of headers
	 */
	public static function flattern($array) {
		return self::flatten($array);
	}

	/**
	 * Decompress an encoded body
	 *
	 * Implements gzip, compress and deflate. Guesses which it is by attempting
	 * to decode.
	 *
	 * @param string $data Compressed data in one of the above formats
	 * @return string Decompressed string
	 */
	public static function decompress($data) {
		if (substr($data, 0, 2) !== "\x1f\x8b" && substr($data, 0, 2) !== "\x78\x9c") {
			// Not actually compressed. Probably cURL ruining this for us.
			return $data;
		}

		if (function_exists('gzdecode') && ($decoded = @gzdecode($data)) !== false) {
			return $decoded;
		}
		elseif (function_exists('gzinflate') && ($decoded = @gzinflate($data)) !== false) {
			return $decoded;
		}
		elseif (($decoded = self::compatible_gzinflate($data)) !== false) {
			return $decoded;
		}
		elseif (function_exists('gzuncompress') && ($decoded = @gzuncompress($data)) !== false) {
			return $decoded;
		}

		return $data;
	}

	/**
	 * Decompression of deflated string while staying compatible with the majority of servers.
	 *
	 * Certain Servers will return deflated data with headers which PHP's gzinflate()
	 * function cannot handle out of the box. The following function has been created from
	 * various snippets on the gzinflate() PHP documentation.
	 *
	 * Warning: Magic numbers within. Due to the potential different formats that the compressed
	 * data may be returned in, some "magic offsets" are needed to ensure proper decompression
	 * takes place. For a simple progmatic way to determine the magic offset in use, see:
	 * https://core.trac.wordpress.org/ticket/18273
	 *
	 * @since 2.8.1
	 * @link https://core.trac.wordpress.org/ticket/18273
	 * @link https://secure.php.net/manual/en/function.gzinflate.php#70875
	 * @link https://secure.php.net/manual/en/function.gzinflate.php#77336
	 *
	 * @param string $gzData String to decompress.
	 * @return string|bool False on failure.
	 */
	public static function compatible_gzinflate($gzData) {
		// Compressed data might contain a full zlib header, if so strip it for
		// gzinflate()
		if (substr($gzData, 0, 3) == "\x1f\x8b\x08") {
			$i = 10;
			$flg = ord(substr($gzData, 3, 1));
			if ($flg > 0) {
				if ($flg & 4) {
					list($xlen) = unpack('v', substr($gzData, $i, 2));
					$i = $i + 2 + $xlen;
				}
				if ($flg & 8) {
					$i = strpos($gzData, "\0", $i) + 1;
				}
				if ($flg & 16) {
					$i = strpos($gzData, "\0", $i) + 1;
				}
				if ($flg & 2) {
					$i = $i + 2;
				}
			}
			$decompressed = self::compatible_gzinflate(substr($gzData, $i));
			if (false !== $decompressed) {
				return $decompressed;
			}
		}

		// If the data is Huffman Encoded, we must first strip the leading 2
		// byte Huffman marker for gzinflate()
		// The response is Huffman coded by many compressors such as
		// java.util.zip.Deflater, Ruby’s Zlib::Deflate, and .NET's
		// System.IO.Compression.DeflateStream.
		//
		// See https://decompres.blogspot.com/ for a quick explanation of this
		// data type
		$huffman_encoded = false;

		// low nibble of first byte should be 0x08
		list(, $first_nibble)    = unpack('h', $gzData);

		// First 2 bytes should be divisible by 0x1F
		list(, $first_two_bytes) = unpack('n', $gzData);

		if (0x08 == $first_nibble && 0 == ($first_two_bytes % 0x1F)) {
			$huffman_encoded = true;
		}

		if ($huffman_encoded) {
			if (false !== ($decompressed = @gzinflate(substr($gzData, 2)))) {
				return $decompressed;
			}
		}

		if ("\x50\x4b\x03\x04" == substr($gzData, 0, 4)) {
			// ZIP file format header
			// Offset 6: 2 bytes, General-purpose field
			// Offset 26: 2 bytes, filename length
			// Offset 28: 2 bytes, optional field length
			// Offset 30: Filename field, followed by optional field, followed
			// immediately by data
			list(, $general_purpose_flag) = unpack('v', substr($gzData, 6, 2));

			// If the file has been compressed on the fly, 0x08 bit is set of
			// the general purpose field. We can use this to differentiate
			// between a compressed document, and a ZIP file
			$zip_compressed_on_the_fly = (0x08 == (0x08 & $general_purpose_flag));

			if (!$zip_compressed_on_the_fly) {
				// Don't attempt to decode a compressed zip file
				return $gzData;
			}

			// Determine the first byte of data, based on the above ZIP header
			// offsets:
			$first_file_start = array_sum(unpack('v2', substr($gzData, 26, 4)));
			if (false !== ($decompressed = @gzinflate(substr($gzData, 30 + $first_file_start)))) {
				return $decompressed;
			}
			return false;
		}

		// Finally fall back to straight gzinflate
		if (false !== ($decompressed = @gzinflate($gzData))) {
			return $decompressed;
		}

		// Fallback for all above failing, not expected, but included for
		// debugging and preventing regressions and to track stats
		if (false !== ($decompressed = @gzinflate(substr($gzData, 2)))) {
			return $decompressed;
		}

		return false;
	}

	public static function match_domain($host, $reference) {
		// Check for a direct match
		if ($host === $reference) {
			return true;
		}

		// Calculate the valid wildcard match if the host is not an IP address
		// Also validates that the host has 3 parts or more, as per Firefox's
		// ruleset.
		$parts = explode('.', $host);
		if (ip2long($host) === false && count($parts) >= 3) {
			$parts[0] = '*';
			$wildcard = implode('.', $parts);
			if ($wildcard === $reference) {
				return true;
			}
		}

		return false;
	}
}