streaming JSON body is an example

example/http/client/body/json_client.cpp

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+#include "json_body.hpp"
+#include <boost/json/src.hpp>
+
+#include <boost/beast/core.hpp>
+#include <boost/beast/http.hpp>
+#include <boost/beast/version.hpp>
+#include <iostream>
+
+namespace beast = boost::beast; // from <boost/beast.hpp>
+namespace http = beast::http;   // from <boost/beast/http.hpp>
+namespace net = boost::asio;    // from <boost/asio.hpp>
+using tcp = net::ip::tcp;       // from <boost/asio/ip/tcp.hpp>
+
+int main(int argc, char ** argv)
+{
+    // Our test endpoint for testing the json
+    const auto host = "postman-echo.com";
+    const auto target = "/post";
+
+    // The io_context is required for all I/O
+    net::io_context ioc;
+
+    // These objects perform our I/O
+    tcp::resolver resolver(ioc);
+    beast::tcp_stream stream(ioc);
+
+    // Look up the domain name
+    auto const results = resolver.resolve(host, "80");
+
+    // Make the connection on the IP address we get from a lookup
+    stream.connect(results);
+
+    // Set up an HTTP GET request message
+    http::request<json_body> req{http::verb::post, target, 11};
+    req.set(http::field::host, host);
+    req.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);
+    req.set(http::field::content_type, "application/json");
+    req.body() = {{"type", "test"}, {"content", "pure awesomeness"}};
+    req.prepare_payload();
+    // Send the HTTP request to the remote host
+    http::write(stream, req);
+    
+    // This buffer is used for reading and must be persisted
+    beast::flat_buffer buffer;
+
+    // Get the response
+    http::response<json_body> res;
+
+    // Receive the HTTP response
+    http::read(stream, buffer, res);
+
+    // Write the message to standard out
+    std::cout << res << std::endl;
+
+    // Gracefully close the socket
+    beast::error_code ec;
+    stream.socket().shutdown(tcp::socket::shutdown_both, ec);
+
+
+    return 0;
+}