Icicle\Http\Driver\Reader\Http1Reader::readResponse PHP Method

    public function readResponse(Socket $socket, float $timeout = 0) : \Generator
    {
        $buffer = new Buffer();
        try {
            do {
                $buffer->push(yield from $socket->read(0, null, $timeout));
            } while (false === ($position = $buffer->search("\r\n")) && $buffer->getLength() < $this->maxStartLineLength);
            if (false === $position) {
                throw new MessageException(Response::REQUEST_HEADER_TOO_LARGE, sprintf('Message start line exceeded maximum size of %d bytes.', $this->maxStartLineLength));
            }
            $line = $buffer->shift($position + 2);
            if (!preg_match("/^HTTP\\/(\\d+(?:\\.\\d+)?) (\\d{3})(?: (.+))?\r\n\$/i", $line, $matches)) {
                throw new ParseException('Could not parse start line.');
            }
            $protocol = $matches[1];
            $code = (int) $matches[2];
            $reason = isset($matches[3]) ? $matches[3] : '';
            $headers = (yield from $this->readHeaders($buffer, $socket, $timeout));
        } finally {
            $socket->unshift((string) $buffer);
        }
        return new BasicResponse($code, $headers, $socket, $reason, $protocol);
    }