Returning JSON object to HTTP POST REST call from C++

int main(void) {
    // Backup the stdio streambufs
    streambuf * cin_streambuf  = cin.rdbuf();
    streambuf * cout_streambuf = cout.rdbuf();
    streambuf * cerr_streambuf = cerr.rdbuf();

    FCGX_Request request;

    FCGX_Init();
    FCGX_InitRequest(&request, 0, 0);

    while (FCGX_Accept_r(&request) == 0) {
        fcgi_streambuf cin_fcgi_streambuf(request.in);
        fcgi_streambuf cout_fcgi_streambuf(request.out);
        fcgi_streambuf cerr_fcgi_streambuf(request.err);

        cin.rdbuf(&cin_fcgi_streambuf);
        cout.rdbuf(&cout_fcgi_streambuf);
        cerr.rdbuf(&cerr_fcgi_streambuf);

        const char * uri = FCGX_GetParam("REQUEST_URI", request.envp);

        string content = get_request_content(request);

        if (content.length() == 0) {
            content = ", World!";
        }
    printcontent(content);
   }

    // restore stdio streambufs
    cin.rdbuf(cin_streambuf);
    cout.rdbuf(cout_streambuf);
    cerr.rdbuf(cerr_streambuf);

    return 0;
}

void printcontent(string content)
{
        cout << "Content-type: text/html\r\n"
             << "\r\n"
             << "<html>\n"
             << "  <head>\n"
             << "    <title>FCGI Test App</title>\n"
             << "  </head>\n"
             << "  <body>\n"
             << "    <h1>Hello " << content << " from " << uri << " !</h1>\n"
         << "  </body>\n"
             << "</html>\n";
}

void makejson(string content)
{
// Create JSON file from 'content' and save file in a predefined location
}