Function do_session

example/http/client/coro/http_client_coro.cpp:40–105

Performs an HTTP GET and prints the response

// Performs an HTTP GET and prints the response
void
do_session(
    std::string const& host,
    std::string const& port,
    std::string const& target,
    int version,
    net::io_context& ioc,
    net::yield_context yield)
{
    beast::error_code ec;

    // These objects perform our I/O
    tcp::resolver resolver(ioc);
    beast::tcp_stream stream(ioc);

    // Look up the domain name
    auto const results = resolver.async_resolve(host, port, yield[ec]);
    if(ec)
        return fail(ec, "resolve");

    // Set the timeout.
    stream.expires_after(std::chrono::seconds(30));

    // Make the connection on the IP address we get from a lookup
    stream.async_connect(results, yield[ec]);
    if(ec)
        return fail(ec, "connect");

    // Set up an HTTP GET request message
    http::request<http::string_body> req{http::verb::get, target, version};
    req.set(http::field::host, host);
    req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);

    // Set the timeout.
    stream.expires_after(std::chrono::seconds(30));

    // Send the HTTP request to the remote host
    http::async_write(stream, req, yield[ec]);
    if(ec)
        return fail(ec, "write");

    // This buffer is used for reading and must be persisted
    beast::flat_buffer b;

    // Declare a container to hold the response
    http::response<http::dynamic_body> res;

    // Receive the HTTP response
    http::async_read(stream, b, res, yield[ec]);
    if(ec)
        return fail(ec, "read");

    // Write the message to standard out
    std::cout << res << std::endl;

    // Gracefully close the socket
    stream.socket().shutdown(tcp::socket::shutdown_both, ec);