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) 2005-2024, 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;
  }
}