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

    public function readRequest(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("/^([A-Z]+) (\\S+) HTTP\\/(\\d+(?:\\.\\d+)?)\r\n\$/i", $line, $matches)) {
                throw new ParseException('Could not parse start line.');
            }
            $method = $matches[1];
            $target = $matches[2];
            $protocol = $matches[3];
            $headers = (yield from $this->readHeaders($buffer, $socket, $timeout));
        } finally {
            $socket->unshift((string) $buffer);
        }
        if ('/' === $target[0]) {
            // origin-form
            $uri = new BasicUri($this->filterHost($this->findHost($headers)) . $target);
            $target = null;
            // Empty request target since it was a path.
        } elseif ('*' === $target) {
            // asterisk-form
            $uri = new BasicUri($this->filterHost($this->findHost($headers)));
        } elseif (preg_match('/^[A-Za-z0-9]+:\\/\\//', $target)) {
            // absolute-form
            $uri = new BasicUri($target);
        } else {
            // authority-form
            $uri = new BasicUri($this->filterHost($target));
        }
        return new BasicRequest($method, $uri, $headers, $socket, $target, $protocol);
    }