Boost Beast gives "The handle is invalid" error after http:async_write - boost

Question

Initially I got error "The file handle supplied is invalid". This is because my socket was closed. I corrected that error.
Now I get another error "The handle is invalid"....Any idea what could be the issue
Below is my code, which is very simple:
void BeastResponse::write(http::response<http::file_body> responseFile)
{
std::cout << "BeastResponse while file write: " << this << std::endl;
auto self = shared_from_this();
http::async_write(m_stream, responseFile, [self](beast::error_code ec, std::size_t t)
{
if (ec)
{
std::cout << "File Write Failed" << ": " << ec.message() << std::endl;
std::cout << t << std::endl;
}
else
{
std::cout << t << std::endl;
};
});
}
Here , t = 4kb when I get the error. So I think async_write after it does the first block of 4kb, my handler or socket is going to a bad state.
If the change to http:write instead of http:async_write, there is no issues

Answer 1

Below code works for me...
void BeastResponse::write(http::response<http::file_body>&& responseFile)
{
std::cout << "BeastResponse while file write: " << this << std::endl;
auto self = shared_from_this();
// copy file into the member variable, m_response_file
m_response_file = std::move(responseFile)
// 2nd parameter must be a member variable of BeastResponse
http::async_write(m_stream, m_response_file, [self](beast::error_code ec, std::size_t t)
{
if (ec)
{
std::cout << "File Write Failed" << ": " << ec.message() << std::endl;
std::cout << t << std::endl;
}
else
{
std::cout << t << std::endl;
};
});
}