<|im_start|>system
You are a helpful AI assistant.<|im_end|>
<|im_start|>user
How to make a HTTP request in C++ code, give me 2 examples using pure C++ and using external library, which is more efficient?<|im_end|>
<|im_start|>assistant
Making an HTTP request in C++ can be done using either pure C++ code or by using an external library. Both approaches have their own advantages and disadvantages, and the most efficient approach will depend on the specific use case.

Here's an example of how to make an HTTP request in pure C++ using the `std::stringstream` and `std::istream` classes:
#include <iostream>
#include <sstream>
#include <istream>
#include <ostream>
#include <string>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <vector>
#include <algorithm>
#include <curl/curl.h>

int main()
{
  CURL *curl;
  CURLcode res;
  std::string readBuffer;

  curl = curl_easy_init();
  if (curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);

    std::cout << readBuffer << std::endl;
  }

  return 0;
}

And here's an example of how to make an HTTP request using the cURL library:

#include <iostream>
#include <sstream>
#include <istream>
#include <ostream>
#include <string>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <vector>
#include <algorithm>
#include <curl/curl.h>

int main()
{
  CURL *curl;
  CURLcode res;
  std::string readBuffer;

  curl = curl_easy_init();
  if (curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);

    std::cout << readBuffer << std::endl;
  }

  return 0;
}

In general, using an external library like cURL can be more efficient, as it provides a higher-level and more user-friendly interface for making HTTP requests. This can save you time and effort, as you won't have to write and maintain the low-level code for making the request yourself. However, if you prefer to have more control over the specifics of the request, or if you're working on a project with very specific requirements, writing the code yourself in pure C++ might be a better option.<|im_end|>
<|im_start|>user
Great, change the examples to do a GET request from https://open-assistant.io/tasks/random<|im_end|>
<|im_start|>assistant
Sure, I have changed the URL in the code to http://open-assistant.io/tasks/random. Note that this will not necessarily work, depending on how the website is configured. For example, the website may require particular user agents. 
```cpp
#include <boost/asio.hpp>
#include <iostream>

using namespace boost::asio;

int main()
{
    io_context io_context;

    ip::tcp::resolver resolver(io_context);
    ip::tcp::resolver::query query("open-assistant.io/tasks/random", "http");
    ip::tcp::resolver::iterator iter = resolver.resolve(query);

    ip::tcp::socket socket(io_context);
    connect(socket, iter);

    std::string request = "GET / HTTP/1.1\r\nHost: open-assistant.io\r\nRefferer:http://open-assistant.io/tasks/random\r\n";
    write(socket, buffer(request));

    boost::asio::streambuf response;
    boost::asio::read_until(socket, response, "\r\n");

    std::cout << &response;

    return 0;
}
```
and 
```cpp
#include <curl/curl.h>

int main(void)
{
    CURL *curl;
    CURLcode res;

    curl = curl_easy_init();
    if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, "open-assistant.io/tasks/random");

        /* Perform the request, res will get the return code */ 
        res = curl_easy_perform(curl);
        /* Check for errors */ 
        if(res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));

        /* always cleanup */ 
        curl_easy_cleanup(curleasycleanup(curl); 
        }

        return 0; 
}
```<|im_end|>
<|im_start|>user
Please complete the last paragraph.<|im_end|>
<|im_start|>assistant
Sorry! Here's the last paragraph completed:

As for efficiency, using an external library such as libcurl can be more efficient because it provides a higher-level API that abstracts away much of the low-level details involved in making an HTTP request. This makes it easier to write code that is more concise and less error-prone, and also eliminates the need to re-implement common features, such as error handling, that are already included in the library. Additionally, libcurl is a well-maintained and widely-used library, so it is likely to have better performance than hand-rolled code. That being said, in some cases, using a library might not be necessary and writing your own code from scratch may provide more control and customization over the HTTP request process, especially if performance is a primary concern. The decision of which approach to use depends on the specific requirements and trade-offs of each project.<|im_end|>