while (buffer.hasRemaining()) {
    final char next = (char) (buffer.get() & 0xFF);
    if(!allowUnescapedCharactersInUrl && !ALLOWED_TARGET_CHARACTER[next]) {
        throw new BadRequestException(UndertowMessages.MESSAGES.invalidCharacterInRequestTarget(next));
    }
    if (next == ' ' || next == '\t') {
        String queryString = stringBuilder.toString();
        if(urlDecodeRequired && this.allowUnescapedCharactersInUrl) {
            queryString = decode(queryString, urlDecodeRequired, state, slashDecodingFlag, false);
        }
        exchange.setQueryString(queryString);
        (...)
        return;
    } else if (next == '\r' || next == '\n') {
        throw UndertowMessages.MESSAGES.failedToParsePath();
    } else {
        if (decode && (next == '+' || next == '%' || next > 127)) { //+ is only a whitespace substitute in the query part of the URL
            urlDecodeRequired = true;
        } else if (next == '=' && nextQueryParam == null) {
          (...)
        } else if (next == '&' && nextQueryParam == null) {
          (...)
            exchange.addQueryParam(decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true, true), "");
            }
            urlDecodeRequired = false;
            queryParamPos = stringBuilder.length() + 1;
        } else if (next == '&') {
            (...)
            exchange.addQueryParam(nextQueryParam, decode(stringBuilder.substring(queryParamPos), urlDecodeRequired, state, true, true));
            urlDecodeRequired = false;
            queryParamPos = stringBuilder.length() + 1;
            nextQueryParam = null;
        }
        stringBuilder.append(next);
    }