Example: comms_http_client

Example output:

Retrieving http://www.google.es/...
Ok: 14160 bytes of type: text/html; charset=ISO-8859-1

C++ example source code:

/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2023, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */


#include <mrpt/comms/net_utils.h>
#include <mrpt/core/exceptions.h>

#include <iostream>

using namespace mrpt;
using namespace mrpt::comms;
using namespace mrpt::comms::net;

std::string url = "http://www.google.es/";

void Test_HTTP_get()
{
    std::string content;

    mrpt::comms::net::HttpRequestOptions httpOptions;
    mrpt::comms::net::HttpRequestOutput httpOut;

    std::cout << "Retrieving " << url << "..." << std::endl;

    http_errorcode ret = http_get(url, content, httpOptions, httpOut);

    if (ret != net::http_errorcode::Ok)
    {
        std::cout << " Error: " << httpOut.errormsg << std::endl;
        return;
    }

    string typ = httpOut.out_headers.count("Content-Type")
        ? httpOut.out_headers.at("Content-Type")
        : string("???");

    std::cout << "Ok: " << content.size() << " bytes of type: " << typ
              << std::endl;
}

int main(int argc, char** argv)
{
    try
    {
        if (argc > 1) url = string(argv[1]);

        Test_HTTP_get();
        return 0;
    }
    catch (const std::exception& e)
    {
        std::cerr << "MRPT error: " << mrpt::exception_to_str(e) << std::endl;
        return -1;
    }
}