How to parse http response to boost beast

Question

I want to parse a response with boost beast.

In my program I receive the response with cpp-httplib and then I try to parse it with boost beast for the further processing. However, I am not quite sure how to parse the response correctly.

Even after reading the boost beast documentation and posts on stackoverflow I have my issues. The last I used for orientation is: How to construct a boost::beast::http::message from std::string?

I must have messed up the lenght of the response. My code throws a message for every response received. :

partial message [beast.http:2]

Here is my code:

int request(httplib::Client &client1, string &bodyContent,    const string target, http::response<http::dynamic_body>  &myres, 
                        std::map<http::field, string> extraField)
{
    httplib::Headers reqHeader;

    // adding extra fields
    if (!extraField.empty())
    {
        for (auto const& el : extraField)
        {

            reqHeader.emplace(http::to_string(el.first), el.second);
        }
    }

    auto res1 = client1.Get(target, reqHeader);
    if (res1->status) {
        bodyContent = res1->body;
        string headerNew ;
        if (!res1->headers.empty())
        {
            httplib::Headers hIn = res1->headers;
            for (auto const& el : hIn)
            {
                headerNew += el.first + ": " + el.second+"\r\n";
            }
        }

        string httpBegin = "HTTP/1.1 " + std::to_string (res1->status);
        string newResponse = httpBegin+ " \r\n" + headerNew+ "\r\n" + res1->body;

        beast::error_code ec;
        http::response_parser<http::dynamic_body> p;

        auto buf = boost::asio::buffer(newResponse);
        auto n   = p.put(buf, ec);
        assert(p.is_header_done());

        if (!ec) {

            p.put_eof(ec);
        }
        if (ec)
            throw boost::system::system_error(ec);
        assert(p.is_done());

        p.release();
    }

    return EXIT_SUCCESS;
}