Amp\Artax\Parser::shiftHeadersFromMessageBuffer PHP Method

    private function shiftHeadersFromMessageBuffer()
    {
        $this->buffer = ltrim($this->buffer, "\r\n");
        if ($headersSize = strpos($this->buffer, "\r\n\r\n")) {
            $headers = substr($this->buffer, 0, $headersSize + 2);
            $this->buffer = substr($this->buffer, $headersSize + 4);
        } elseif ($headersSize = strpos($this->buffer, "\n\n")) {
            $headers = substr($this->buffer, 0, $headersSize + 1);
            $this->buffer = substr($this->buffer, $headersSize + 2);
        } else {
            $headersSize = strlen($this->buffer);
            $headers = null;
        }
        if ($this->maxHeaderBytes > 0 && $headersSize > $this->maxHeaderBytes) {
            throw new ParseException($this->getParsedMessageArray(), $msg = "Maximum allowable header size exceeded: {$this->maxHeaderBytes}", $code = 431, $previousException = null);
        }
        return $headers;
    }